Spur Gears - Boston Gear

Spur Gears Section Contents

A

14-1/2° PRESSURE ANGLE – CATALOG NUMBER / DIMENSIONS

Spur Gears................................................................................................................................. 18-27



Change Gears............................................................................................................................. 28-32



Stem Pinions..................................................................................................................................... 33



Drawn Pinion Wire............................................................................................................................ 34

Rack................................................................................................................................................... 35

Internal Gears................................................................................................................................... 36

20° PRESSURE ANGLE – CATALOG NUMBER / DIMENSIONS

Spur Gears.................................................................................................................................. 37-46

Rack................................................................................................................................................... 47

Internal Gears................................................................................................................................... 48

Selection Procedure.................................................................................................................................. 49 Horsepower & Torque Ratings.......................................................................................................... 50-62 Gear Gauges.............................................................................................................................................. 62 Stock Altered/Custom Spur Gears........................................................................................................ 3-5 Spur Gear Engineering Information............................................................................................... 306-311

P-1930-BG

9/17

Boston Gear 800-825-6544

17

Spur Gears 48 and 32 Diametral Pitch (Brass) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Without Keyway Style Hub or Setscrew No. See of Pitch Page Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code

A

48 DIAMETRAL PITCH

FACE

PITCH DIA.

HUB PROJ.

BORE

HUB DIA.

OVERALL LENGTH

BRASS 10 .208 .0935 – – G127 09322 12 .250 G129 09324 14 .292 G130 09326 15 .312 .125 – – G131 09328 16 .333 G132 09330 18 .375 G133 09332 20 .417 G134 09334 22 .458 G135 09336 24 .500 G136 09338 26 .542 G137 09340 32 .667 .1875 – – A G138 09342 36 .750 G139 09344 40 .833 G140 09346 44 .917 G141 09348 48 1.000 G142 09350 54 1.125 G143 09352 60 1.250 G144 09354 66 1.375 .250 .50 .25 G145 09356 72 1.500 G146 09358 84 1.750 G147 09360 96 2.000 G148 09362 100 2.083 G154 09364 120 2.500 .3125 .62 .31 D G149 09366 144 3.000 G150 09368 192 4.000 G151 09370 32 DIAMETRAL PITCH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

48 D.P.

48 D.P.

32 D.P.

32 D.P.

REFERENCE PAGES Alterations — 322 Lubrication — 322 Materials — 323

18

Boston Gear 800-825-6544

Face = .125” Outside Dia. = Pitch Dia. + .042” Overall Length = .125” + Hub Proj.

10 14 16 20 24 28 32 40 48 64 80 96 112 128 8 10 12 14 15 16 18 20 22 24 26 28 30 32 36 40 44 48 52 56

Face = .062” Outside Dia. = Pitch Dia. + .062”

BRASS .312 .125 – – G96 09234 .438 G98 09238 .500 G99 09240 .625 G101 09244 .750 .1875 – – G102 09246 .875 G103 09248 1.000 A G104 09250 1.250 .250 – – G105 09252 1.500 G106 09254 2.000 G110 09256 2.500 .3125 – – G111 09258 3.000 G112 09260 3.500 G113 09262 4.000 .375 – – G114 09264 Face = .188” .250 G159 09266 .312 G161 09268 .375 .125 – – G163 09270 .438 G165 09272 .469 G166 09274 .500 G167 09276 .562 G168 09278 .625 G169 09280 .688 .1875 – – A G170 09282 .750 G171 09284 .812 G172 09286 .875 G173 09288 .938 G174 09290 1.000 G175 09292 1.125 G176 09294 1.250 .250 – – G177 09296 1.375 G178 09298 1.500 G179 09300 1.625 G180 09302 1.750 .3125 – – G181 09304 P-1930-BG

9/17

Spur Gears 32 and 24 Diametral Pitch (Brass & Steel) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Style Without Keyway With No. Hub or Setscrew Setscrew See of Pitch Page Catalog Item Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code Number Code 32 DIAMETRAL PITCH

A

Face = .188” Outside Dia. = Pitch Dia. + .062” Overall Length = .187” + Hub Proj.

BRASS 2.000 .25 B G182 09306 – – 2.250 C G183 09308 – – 2.500 .3125 .62 G184 09310 – – 3.000 .31 D G185 09312 – – 3.500 G186 09314 – – 4.000 .75 G187 09316 – – STEEL 16 .500 .1875 – – S3216 09572 – – 20 .625 S3220 09574 – – .250 – – 22 .688 S3222 09576 – – 24 .750 .3125 – – S3224 09578 – – 28 .875 .375 – – S3228 09580 – – 32 1.000 .375 S3232 09582 – – 40 1.250 S3240 09584 – – 48 1.500 S3248 09586 – – 56 1.750 .375 – – S3256 09588 – – 64 2.000 S3264 09590 – – 80 2.500 S3280 09592 – – 96 3.000 S3296 09594 – – 16 .500 .39 – – H3216 09536 18 .562 .1875 .45 .31 – – H3218 09538 20 .625 .52 A – – H3220 09540 .31 – – 22 .688 .250 .58 H3222 09542 24 .750 .64 – – H3224 09544 26 .812 .70 – – H3226 09546 28 .875 .3125 .75 .31 – – H3228 09548 30 .938 .75 – – H3230 09550 32 1.000 .75 .38 – – H3232 09552 40 1.250 – – 09554 .88 .38 – – H3240 48 1.500 H3248 09556 56 1.750 – – 09558 1.00 .38 – – H3256 64 2.000 H3264 09560 80 2.500 .375 1.12 .38 – – H3280 09562 96 3.000 1.25 .50 – – H3296 09564 128 4.000 1.88 .50 – – H32128 09566 160 5.000 2.12 .50 – – H32160 09568 192 6.000 2.12 .50 – – H32192 09570 Face = .250” 24 Outside Dia. = Pitch Dia. + .083” DIAMETRAL PITCH Overall Length = .250” + Hub Proj. BRASS 12 .500 .38 G254 09202 – – 16 .667 .1875 .50 .25 G256 09204 – – 18 .750 .50 A G257 09206 – – 24 1.000 G258 09208 – – 30 1.250 .250 .62 .25 G259 09210 – – 36 1.500 G261 09212 – – 42 1.750 .62 .25 B G263 09214 – – 48 2.000 G264 09216 – – 54 2.250 .3125 .69 .31 G265 09218 – – C 60 2.500 G266 09220 – – 66 2.750 G267 09222 – – 72 3.000 .75 .31 G268 09224 – – 84 3.500 .75 .31 G269 09226 – – 96 4.000 .375 .75 .31 D G270 09228 – – 120 5.000 .88 .38 G272 09230 – – 144 6.000 .88 .38 G274 09232 – – 64 72 80 96 112 128

P-1930-BG

9/17

HUB PROJ.

FACE

PITCH DIA.

BORE

HUB DIA.

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

32 D.P. D.P. 32

24 D.P. 24 D.P.

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 50 Lubrication — 322 Materials — 323 Selection Procedure — 49

Boston Gear 800-825-6544

19

Spur Gears 24 and 20 Diametral Pitch (Steel) 14-1/2° Pressure Angle (will not operate with 20° spurs)

ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

No. Hub of Pitch Teeth Dia. Bore Dia. Proj.

A



24

DIAMETRAL PITCH

FACE

HUB PROJ. KEYWAY

PITCH DIA.

BORE

HUB DIA.

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

24 D.P. D.P. 32 20 D.P.

2024 D.P.D.P. 16 D.P.

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 50, 51 Lubrication — 322 Materials — 323 Selection Procedure — 49 *Special Pitch Diameter, used for calculating Center Distance only, not Ratio. †H2412 & H2414 have #35 (.110) drilled hole through one wall, no keyway. ‡H2415-H24144 has one setscrew, no keyway. **NA11B-5/16”-NA14B-5/16 bore has #35 (.110) drilled hole through one wall, no keyway. ††3/8” & 1/2” bores have one setscrew, no keyway. NA40-5/8” & NA40-3/4” bores have standard keyway at 90° to setscrew. See Page 323.

20

Boston Gear 800-825-6544

Style Without Keyway With Keyway or Setscrew & Setscrew† See Page Catalog Item Catalog Item 323 Number Code Number Code Face = .250” Outside Dia. = Pitch Dia. + .083” Overall Length = .250” + Hub Proj.

STEEL 12 .500 .250 – – S2412 09630 – – 15 .625 – – S2415 09632 – – 16 .667 .3125 – – S2416 09634 – – 18 .750 – – S2418 09636 – – 21 .875 .375 – – S2421 09638 – – 24 1.000 S2424 09640 – – 30 1.250 S2430 09642 – – 36 1.500 S2436 09644 – – 42 1.750 .500 – – S2442 09646 – – 48 2.000 S2448 09648 – – 60 2.500 S2460 09650 – – 72 3.000 S2472 09652 – – 12 .500 .36 – – H2412† 09596 14 .583 .250 .46 .31 A – – H2414† 09598 15 .625 .50 – – H2415‡ 09600 16 .667 .54 – – H2416‡ 09602 18 .750 .3125 .62 .31 – – H2418‡ 09604 20 .833 .70 – – H2420‡ 09606 21 .875 .74 .31 – – H2421‡ 09608 24 1.000 .87 – – H2424‡ 09610 30 1.250 1.00 – – H2430‡ 09612 36 1.500 .375 1.12 .38 – – H2436‡ 09614 42 1.750 1.12 – – H2442‡ 09616 48 2.000 1.25 – – H2448‡ 09618 60 2.500 1.25 – – H2460‡ 09620 72 3.000 1.38 – – H2472‡ 09622 96 4.000 .500 2.00 .50 – – H2496‡ 09624 120 5.000 2.25 – – H24120‡ 09626 144 6.000 2.25 – – H24144‡ 09628 Face = .375” 20 Outside Dia. = Pitch Dia. + .100” DIAMETRAL PITCH Overall Length = .375” + Hub Proj. STEEL 11 .600* .46 NA11B 09662 NA11B-5/16** 46000 12 .600 .3125 .46 .38 NA12B 09664 NA12B-5/16** 46001 13 .650 .50 NA13B 09666 NA13B-5/16** 46002 14 .700 .56 NA14B 09668 NA14B-5/16** 46003 15 .750 .60 NA15B 09670 NA15B-3/8†† 46004 16 .800 .375 .66 .38 NA16B 09672 NA16B-3/8†† 46005 18 .900 .74 NA18B 09674 NA18B-3/8†† 46006 20 1.000 .375 .84 .38 NA20B 09676 NA20B-3/8†† 46007 .500 – – NA20B-1/2†† 46008 †† 46009 22 .375 NA22B 09678 NA22B-3/8 1.100 .82 .38 .500 – – NA22B-1/2†† 46010 24 1.200 .375 .92 .38 NA24 09680 NA24-3/8†† 46011 .500 – – NA24-1/2†† 46012 25 1.250 .375 .97 .38 NA25B 09682 NA25B-3/8†† 46013 .500 – – NA25B-1/2†† 46014 28 1.400 .375 1.12 .38 A NA28B 09684 NA28B-3/8†† 46015 .500 – – NA28B-1/2†† 46016 30 1.500 .375 1.22 .38 NA30B 09686 NA30B-3/8†† 46017 .500 – – NA30B-1/2†† 46018 32 1.600 .375 1.32 .50 NA32 09688 NA32-3/8†† 46019 .500 – – NA32-1/2†† 46020 35 1.750 .375 1.47 .50 NA35 09690 NA35-3/8†† 46021 .500 – – NA35-1/2†† 46022 36 1.800 .375 1.52 .50 NA36 09692 NA36-3/8†† 46023 .500 – – NA36-1/2†† 46024 .375 NA40 09694 NA40-3/8†† 46025 40 2.000 .500 1.72 .50 – – NA40-1/2†† 46026 .625 – – NA40-5/8 46027 .750 – – NA40-3/4 46028 48 2.400 1.33 NA48A 10208 – – 50 2.500 .375 1.42 .50 NA50A 10210 – – 60 3.000 1.92 NA60A 10212 – – 64 3.200 2.12 NA64A 10214 – – P-1930-BG

9/17

Spur Gears 20 and 16 Diametral Pitch (Cast Iron, Brass & Steel) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Style Without Keyway With Keyway No. Hub or Setscrew and Setscrew† See of Pitch Page Catalog Item Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code Number Code 20 DIAMETRAL PITCH

Face = .375” Outside Dia. = Pitch Dia. + .100” Overall Length = .375” + Hub Proj.

CAST IRON 70 3.500 .375 1.25 .50 NA70 10216 – – 72 3.600 B NA72 10218 – – 80 4.000 NA80 10220 – – 84 4.200 NA84 10222 – – 90 4.500 .500 1.25 .50 C NA90 10224 – – 96 4.800 NA96 10226 – – 100 5.000 NA100 10228 – – 112 5.600 NA112 10230 – – 120 6.000 NA120 10232 – – .50 140 7.000 NA140 10234 – – 1.50 D 144 7.200 .500 NA144 10236 – – 160 8.000 NA160 10238 – – 180 9.000 .62 NA180 10240 – – 200 10.000 2.25 NA200B 10242 – – Face = .313” 16 Outside Dia. = Pitch Dia. + .125” DIAMETRAL PITCH Overall Length = Face + Hub Proj. BRASS 8 .500 .1875 – – G226 09168 – – 9 .563 G227 09170 – – 10 .625 G228 09172 – – 12 .750 G229 09174 – – 14 .875 .250 – – A G230 09176 – – 16 1.000 G231 09178 – – 18 1.125 G232 09180 – – 20 1.250 G233 09182 – – 24 1.500 .3125 – – G235 09184 – – 28 1.750 – – G236 09186 – – 32 2.000 B G237 09188 – – 40 2.500 .3125 .75 .31 G238 09190 – – 48 3.000 G239 09192 – – 56 3.500 .88 D G240 09194 – – 64 4.000 .375 1.00 .38 G241 09196 – – 80 5.000 1.00 G242 09198 – – STEEL Face = .500” 11 .750* .56 NB11B 09704 NB11B-3/8† 46029 12 .750 .375 .56 09706 NB12B-3/8† 46030 .44 NB12B 13 .813 .63 NB13B 09708 NB13B-3/8† 46031 14 .875 .69 NB14B 09710 NB14B-3/8† 46032 15 .938 .75 NB15B 09712 NB15B-1/2† 46033 16 1.000 .500 .81 .44 NB16B 09714 NB16B-1/2† 46034 18 1.125 .94 NB18B 09716 NB18B-1/2† 46035 20 1.250 .500 .96 .44 NB20B 09718 NB20B-1/2† 46036 .625 – – NB20B-5/8 46037 22 1.375 .500 1.08 .44 NB22B 09720 NB22B-1/2† 46038 .625 – – NB22B-5/8 46039 .500 NB24B 09722 NB24B-1/2† 46040 24 1.500 .625 1.20 .44 A – – NB24B-5/8 46041 .750 – – NB24B-3/4 46042 .500 NB26B 09724 NB26B-1/2† 46043 26 1.625 .625 1.33 .44 – – NB26B-5/8 46044 .750 – – NB26B-3/4 40645 .500 NB28B 09726 NB28B-1/2† 46046 28 1.750 .625 1.45 .50 – – NB28B-5/8 46047 .750 – – NB28B-3/4 46048 .875 – – NB28B-7/8 46049 .500 NB30B 09728 NB30B-1/2† 46050 .625 – – NB30B-5/8 46051 30 1.875 .750 1.58 .50 – – NB30B-3/4 46052 .875 – – NB30B-7/8 46053 1.000 – – NB30B-1 46054

P-1930-BG

9/17

A

HUB PROJ.

FACE

KEYWAY

PITCH DIA.

BORE

HUB DIA.

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

20 D.P. 20 D.P.

16 D.P. D.P. 16

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 51, 52 Lubrication — 322 Materials — 323 Selection Procedure — 49 *Special Pitch Diameter, used for calculating Center Distance only, not Ratio. †3/8” and 1/2” bores have one setscrew, no keyway. 5/8” bore and larger have standard keyway at 90° to setscrew. See Page 323.

Boston Gear 800-825-6544

21

Spur Gears 16 and 12 Diametral Pitch (Steel, Non-Metallic & Cast Iron) 14-1/2° Pressure Angle (will not operate with 20° spurs)

ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Style Without Keyway With Keyway No. Hub or Setscrew and Setscrew† See of Pitch Page Catalog Item Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code Number Code

A

16 DIAMETRAL PITCH

HUB PROJ.

FACE

KEYWAY

PITCH DIA.

BORE

HUB DIA.

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

16 D.P. 16 D.P.

12 D.P. D.P. 12

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 52, 53 Lubrication — 322 Materials — 323 Selection Procedure — 49 *Special Pitch Diameter, used for calculating Center Distance only, not Ratio. †1/2” bore has one setscrew, no keyway. 5/8” bore and larger have standard keyway at 90° to setscrew. See Page 323.

22

Boston Gear 800-825-6544

Face = .500” Outside Dia. = Pitch Dia. + .125” Overall Length = .500” + Hub Proj.

STEEL .500 NB32 09730 NB32-1/2† 46055 .625 – – NB32-5/8 46056 32 2.000 .750 1.70 .50 – – NB32-3/4 46057 .875 A – – NB32-7/8 46058 1.000 – – NB32-1 46059 36 2.250 1.95 NB36 09732 – – 40 2.500 .500 1.69 .50 NB40A 10244 – – 48 3.000 2.19 NB48A 10246 – – NON-METALLIC 16 1.000 .375 .81 09014 – – .50 QBH16 20 1.250 1.06 QBH20 09018 – – 24 1.500 1.31 .50 QBH24 09022 – – 32 2.000 1.81 .50 A QBH32 09024 – – 40 2.500 .500 – – QB40 09000 – – 48 3.000 – – QB48 09002 – – 64 4.000 – – QB64 09006 – – CAST IRON 54 3.375 1.25 .50 NB54 10248 – – 56 3.500 .500 1.25 .50 B NB56 10250 – – 60 3.750 1.38 .62 NB60 10252 – – 64 4.000 1.38 NB64 10254 – – 72 4.500 1.38 NB72 10256 – – C 80 5.000 1.50 NB80 10258 – – 84 5.250 .625 1.50 .62 NB84 10260 – – 96 6.000 1.50 NB96 10262 – – 112 7.000 1.50 NB112 10264 – – 120 7.500 1.50 NB120 10266 – – 128 8.000 1.50 D NB128 10268 – – 144 9.000 1.75 NB144 10270 – – 160 10.000 .625 1.75 .75 NB160B 10272 – – 192 12.000 2.00 NB192B 10274 – – Face = .750” 12 Outside Dia. = Pitch Dia. + .167” DIAMETRAL PITCH Overall Length = .750” + Hub Proj. STEEL 11 1.000* .75 ND11B 09744 ND11B-1/2† 46060 12 1.000 .500 .75 09746 ND12B-1/2† 46061 .50 ND12B 13 1.083 .83 ND13B 09748 ND13B-1/2† 46062 14 1.167 .92 ND14B 09750 ND14B-1/2† 46063 15 1.250 1.00 ND15B 09752 ND15B-5/8 46064 16 1.333 .625 .99 .50 ND16B 09754 ND16B-5/8 46065 18 1.500 1.15 ND18B 09756 ND18B-5/8 46066 20 .625 1.32 .50 ND20B 09758 ND20B-5/8 46067 1.667 .750 – – ND20B-3/4 46068 .625 ND21B 09760 ND21B-5/8 46069 21 1.750 .750 1.40 .50 – – ND21B-3/4 46070 .875 A – – ND21B-7/8 46071 .625 ND22B 09762 ND22B-5/8 46072 22 1.833 .750 1.49 .50 – – ND22B-3/4 46073 .875 – – ND22B-7/8 46074 1.000 – – ND22B-1 46075 .625 ND24B 09764 ND24B-5/8 46076 24 2.000 .750 1.65 .50 – – ND24B-3/4 46077 .875 – – ND24B-7/8 46078 1.000 – – ND24B-1 46079 30 2.500 2.15 ND30 09766 – – 32 2.667 1.92 ND32A 10276 – – 36 3.000 .625 2.25 .62 ND36A 10278 – – 40 3.333 2.34 ND40A 10280 – – 42 3.500 2.50 ND42A 10282 – –

P-1930-BG

9/17

Spur Gears 12 and 10 Diametral Pitch (Steel, Non-Metallic & Cast Iron) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Style Without Keyway With Keyway No. Hub or Setscrew and Setscrew† See of Pitch Page Catalog Item Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code Number Code Face = .750” Outside Dia. = Pitch Dia. + .167” Overall Length = .750” + Hub Proj. NON-METALLIC 15 1.250 1.00 QDH15 09038 – – 18 1.500 .500 1.25 .50 QDH18 09042 – – 21 1.750 1.50 QDH21 09046 – – 24 2.000 1.75 QDH24 09050 – – .50 A 30 2.500 .625 2.25 QDH30 09052 – – 36 3.000 – – QD36 09026 – – 48 4.000 – – QD48 09030 – – 60 5.000 .750 – – QD60 09034 – – CAST-IRON 48 4.000 ND48 10284 – – 54 4.500 C ND54 10286 – – 60 5.000 .750 1.75 .75 ND60 10288 – – 64 5.333 ND64 10290 – – 72 6.000 ND72 10292 – – 84 7.000 ND84 10294 – – 96 8.000 ND96 10296 – – 108 9.000 .750 2.00 .75 D ND108 10298 – – 112 9.333 ND112 10300 – – 120 10.000 ND120 10302 – – 144 12.000 .875 2.00 1.00 ND144 10304 – – 168 14.000 ND168 10306 – – Face = 1.000” 10 Outside Dia. = Pitch Dia. + .200” DIAMETRAL PITCH Overall Length = 1.000” + Hub Proj. STEEL 11 1.200* .92 NF11B 09778 NF11B-5/8 46080 12 1.200 .625 .92 .62 NF12B 09780 NF12B-5/8 46081 14 1.400 1.02 NF14B 09782 NF14B-5/8 46082 15 1.500 .750 1.12 .62 NF15B 09784 NF15B-3/4 46083 16 1.600 1.22 NF16B 09786 NF16B-3/4 46084 18 1.800 .750 1.42 .62 NF18B 09788 NF18B-3/4 46085 .875 – – NF18B-7/8 46086 .750 NF20B 09790 NF20B-3/4 46087 20 2.000 .875 1.62 .62 – – NF20B-7/8 46088 1.000 A – – NF20B-1 46089 .750 NF24B 09792 NF24B-3/4 46090 24 2.400 .875 2.02 .62 – – NF24B-7/8 46091 1.000 – – NF24B-1 46092 25 2.500 .750 2.12 .62 NF25 09794 – – 28 2.800 1.81 NF28A 10310 – – 30 3.000 2.02 NF30A 10312 – – 32 3.200 .750 2.22 .88 NF32A 10314 – – 35 3.500 2.52 NF35A 10316 – – 36 3.600 2.61 NF36A 10318 – – NON-METALLIC 15 1.500 .625 1.20 .62 QFH15 09062 – – 18 1.800 1.50 QFH18 09066 – – 20 2.000 1.70 A QFH20 09068 – – 25 2.500 .750 2.20 .62 QFH25 09070 – – 30 3.000 2.70 QFH30 09072 – –

A

12 DIAMETRAL PITCH

FACE

PITCH DIA.

HUB PROJ.

BORE

HUB DIA.

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

12 D.P. 12 D.P.

10 D.P. 10 D.P.

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 53, 54 Lubrication — 322 Materials — 323 Selection Procedure — 49 *Special Pitch Diameter, used for calculating Center Distance only, not Ratio.

†All gears have standard keyway at 90° to setscrew. See Page 323.

P-1930-BG

9/17

Boston Gear 800-825-6544

23

Spur Gears 10 and 8 Diametral Pitch (Cast Iron, Steel & Non-Metallic) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Style Without Keyway With Keyway No. Hub or Setscrew and Setscrew† See of Pitch Page Catalog Item Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code Number Code

A

10 DIAMETRAL PITCH

HUB PROJ.

FACE

KEYWAY

PITCH DIA.

BORE

HUB DIA.

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

10 10D.P. D.P.

D.P. 88 D.P.

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 54, 55 Lubrication — 322 Materials — 323 Selection Procedure — 49 *Special Pitch Diameter, used for calculating Center

Face = 1.000” Outside Dia. = Pitch Dia. + .200” Overall Length = 1.000” + Hub Proj.

CAST IRON 40 4.000 NF40 10320 – – 42 4.200 NF42 10322 – – 45 4.500 B NF45 10324 – – 48 4.800 NF48 10326 – – 50 5.000 NF50 10328 – – 54 5.400 2.12 C NF54 10330 – – 55 5.500 .875 .88 NF55 10332 – – 60 6.000 NF60 10334 – – 64 6.400 NF64 10336 – – 70 7.000 NF70 10338 – – 72 7.200 NF72 10340 – – 80 8.000 NF80 10342 – – 84 8.400 NF84 10344 – – 90 9.000 2.25 D NF90 10346 – – 96 9.600 NF96 10348 – – 100 10.000 2.25 .88 NF100 10350 – – 110 11.000 NF110 10352 – – 120 12.000 NF120 10356 – – 140 14.000 1.00 2.50 NF140 10358 – – 1.00 144 14.400 NF144 10360 – – 160 16.000 NF160 10362 – – 180 18.000 2.75 NF180 10364 – – Face = 1.250” 8 Outside Dia. = Pitch Dia. + .250” DIAMETRAL PITCH Overall Length = 1.250” + Hub Proj. STEEL 11 1.500* 1.12 NH11B 09806 NH11B-3/4 46093 12 1.500 .750 1.12 .75 NH12B 09808 NH12B-3/4 46094 14 1.750 1.31 NH14B 09810 NH14B-3/4 46095 15 1.875 .875 1.43 .75 NH15B 09812 NH15B-7/8 46096 16 2.000 .875 1.56 .75 NH16B 09814 NH16B-7/8 46097 1.000 – – NH16B-1 46098 .875 NH18B 09816 NH18B-7/8 46099 18 2.250 1.000 1.81 .75 – – NH18B-1 46100 1.125 – – NH18B-1-1/8 46101 .875 A NH20B 09818 NH20B-7/8 46102 20 2.500 1.000 2.06 .75 – – NH20B-1 46103 1.125 – – NH20B-1-1/8 46104 .875 NH22B 09820 NH22B-7/8 46105 22 2.750 1.000 2.31 .75 – – NH22B-1 46106 1.125 – – NH22B-1-1/8 46107 24 3.000 2.06 NH24A 10368 – – 28 3.500 .875 2.56 .88 NH28A 10370 – – 30 3.750 2.75 NH30A 10372 – – – – 32 4.000 1.000 3.00 .88 NH32A 10374 NON-METALLIC 16 2.000 .750 1.62 .75 QHH16 09082 – – 18 2.250 1.88 QHH18 09084 – – 20 2.500 2.12 A QHH20 09086 – – 24 3.000 .875 2.62 .75 QHH24 09088 – – 28 3.500 3.12 QHH28 09090 – –

Distance only, not Ratio.

†All gears have standard keyway, at 90° to setscrew. See Page 323.

24

Boston Gear 800-825-6544

P-1930-BG

9/17

Spur Gears 8 and 6 Diametral Pitch (Cast Iron & Steel) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Style Without Keyway With Keyway No. Hub or Setscrew and Setscrew† See of Pitch Page Catalog Item Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code Number Code 8 DIAMETRAL PITCH

A

Face = 1.250” Outside Dia. = Pitch Dia. + .250” Overall Length = 1.250” + Hub Proj.

CAST IRON 36 4.500 NH36 10376 – – 40 5.000 NH40 10378 – – 42 5.250 B NH42 10380 – – 44 5.500 NH44 10382 – – 48 6.000 1.000 2.50 1.00 NH48 10384 – – 54 6.750 C NH54 10386 – – 56 7.000 NH56 10388 – – 60 7.500 NH60 10390 – – 64 8.000 NH64 10392 – – 72 9.000 NH72 10394 – – 80 10.000 NH80 10396 – – 84 10.500 NH84 10398 – – 88 11.000 D NH88 10400 – – 96 12.000 1.125 3.00 1.12 NH96 10402 – – 112 14.000 NH112 10404 – – 120 15.000 NH120 10406 – – 128 16.000 NH128 10408 – – 144 18.000 NH144 10410 – – 160 20.000 1.125 3.25 1.25 NH160B 10412 – – Face = 1.500” 6 Outside Dia. = Pitch Dia + .333” DIAMETRAL PITCH Overall Length = 1.500” + Hub Proj. STEEL 11 2.000* 1.000 1.46 .88 NJ11B 09830 NJ11B-1 46108 12 2.000 NJ12B 09832 NJ12B-1 46109 14 2.333 1.000 1.79 .88 NJ14B 09834 NJ14B-1 46110 1.125 – – NJ14B-1-1/8 46111 1.000 NJ15B 09836 NJ15B-1 46112 15 2.500 1.125 1.96 .88 – – NJ15B-1-1/8 46113 1.1875 – – NJ15B-1-3/16 46114 1.250 – – NJ15B-1-1/4 46115 1.000 NJ16B 09838 NJ16B-1 46116 16 2.667 1.125 2.13 .88 – – NJ16B-1-1/8 46117 1.1875 A – – NJ16B-1-3/16 46118 1.250 – – NJ16B-1-1/4 46119 1.000 NJ18B 09840 NJ18B-1 46120 18 3.000 1.125 2.46 .88 – – NJ18B-1-1/8 46121 1.1875 – – NJ18B-1-3/16 46122 1.250 – – NJ18B-1-1/4 46123 1.000 NJ20 09842 NJ20-1 46124 20 3.333 1.125 2.79 .88 – – NJ20-1-1/8 46125 1.1875 – – NJ20-1-3/16 46126 1.250 – – NJ20-1-1/4 46127 21 3.500 1.000 2.96 .88 NJ21B 09844 – – 24 4.000 3.00 NJ24A 10414 – – 27 4.500 1.125 3.50 .88 NJ27A 10416 – – 30 5.000 4.00 NJ30A 10418 – –

FACE

PITCH DIA.

HUB PROJ.

BORE

HUB DIA.

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

88 D.P. D.P.

6 D.P. D.P. 6

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 55, 56 Lubrication — 322 Materials — 323 Selection Procedure — 49 *Special Pitch Diameter, used for calculating Center Distance only, not Ratio.

†All gears have standard keyway, at 90° to setscrew. See Page 323.

P-1930-BG

9/17

Boston Gear 800-825-6544

25

Spur Gears 6 and 5 Diametral Pitch (Steel & Cast Iron)

14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Without Keyway Style Hub or Setscrew No. See of Pitch Page Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code

A

6 DIAMETRAL PITCH

FACE

PITCH DIA.

HUB PROJ.

BORE

HUB DIA.

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

D.P. 66D.P.

D.P. 55D.P.

Face = 1.500˝ Outside Dia. = Pitch Dia + .333˝ Overall Length = 1.500˝ + Hub Proj.

CAST IRON 32 5.333 NJ32 10420 33 5.500 B NJ33 10422 36 6.000 NJ36 10424 40 6.667 1.125 2.50 1.00 C NJ40 10426 42 7.000 NJ42 10428 48 8.000 NJ48 10430 54 9.000 NJ54 10432 60 10.000 NJ60 10434 64 10.667 NJ64 10436 3.00 66 11.000 NJ66 10438 72 12.000 1.25 D NJ72 10440 84 14.000 1.250 NJ84 10442 96 16.000 3.25 NJ96 10444 108 18.000 NJ108 10446 120 20.000 3.50 1.50 NJ120B 10448 144 24.000 3.75 NJ144B 10452 Face = 1.750” 5 Outside Dia. = Pitch Dia. + .400” DIAMETRAL PITCH Overall Length = 1.750” + Hub Proj. STEEL 11 2.400* 1.78 NK11B 09846 12 2.400 1.78 NK12B 09848 14 2.800 2.18 NK14B 09850 15 3.000 1.0625 2.38 .88 A NK15B 09852 16 3.200 2.58 NK16B 09854 18 3.600 2.98 NK18B 09856 20 4.000 3.38 NK20B 09858 CAST IRON 24 4.800 A NK24B 10454 25 5.000 1.0625 3.00 1.25 NK25B 10456 30 6.000 NK30B 10458 35 7.000 B NK35B 10460 40 8.000 1.1875 3.00 1.25 NK40B 10462 45 9.000 NK45B 10464 50 10.000 NK50B 10466 55 11.000 NK55B 10468 60 12.000 1.1875 3.50 1.25 D NK60B 10470 70 14.000 NK70B 10472 80 16.000 NK80B 10474 100 20.000 1.3125 3.75 1.50 NK100B 10478 *Special Pitch Diameter, used for calculating Center Distance only, not Ratio.

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 56 Lubrication — 322 Materials — 323 Selection Procedure — 49

26

Boston Gear 800-825-6544

P-1930-BG

9/17

Spur Gears 4 and 3 Diametral Pitch (Steel & Cast Iron) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Without Keyway Style Hub or Setscrew No. See of Pitch Page Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code 4 DIAMETRAL PITCH 11 12 14 15 16 18 20 22

Face = 2.000” Outside Dia. = Pitch Dia. + .500” Overall Length = 2.000” + Hub Proj.

STEEL 3.000* 2.27 3.000 2.27 3.500 2.77 3.750 1.125 3.02 .88 A 4.000 3.27 4.500 3.77 5.000 4.27 5.500 4.77 CAST IRON 6.000 1.125 A 7.000 7.500 3.50 B 8.000 9.000 10.000 10.500 C 11.000 1.250 1.50 12.000 13.500 4.00 14.000 15.000 16.000 D 18.000 20.000 1.50 21.000 1.375 4.50 22.000 1.75 24.000

NL11B 09860 NL12B 09862 NL14B 09864 NL15B 09866 NL16B 09868 NL18B 09870 NL20B 09872 NL22B 09874

24 NL24B 10484 28 NL28B 10486 30 NL30 10488 32 NL32B 10490 36 NL36B 10492 40 NL40B 10494 42 NL42 10496 44 NL44B 10498 48 NL48B 10500 54 NL54 10502 56 NL56B 10504 60 NL60 10506 64 NL64B 10508 72 NL72B 10510 80 NL80B 10512 84 NL84 10514 88 NL88B 10516 96 NL96B 10518 Face = 3.000”† 3 Outside Dia. = Pitch Dia. + .667” DIAMETRAL PITCH Overall Length = Face + Hub Proj. STEEL 11 4.000* NO11B† 09876 12 4.000 NO12B† 09878 14 4.667 NO14B 09880 15 5.000 1.3125 – – NO15B 09882 A 16 5.333 NO16B 09884 18 6.000 NO18B 09886 20 6.667 NO20 09888 21 7.000 NO21B 09890 CAST IRON 24 8.000 4.50 1.25 NO24B 10524 30 10.000 1.4375 B NO30B 10526 36 12.000 5.25 1.75 NO36B 10528 42 14.000 C NO42 10530 48 16.000 1.5625 5.25 NO48B 10532 1.75 60 20.000 NO60B 10536 72 24.000 1.6875 5.50 1.75 D NO72B 10538 84 28.000 5.75 NO84B 10540 96 32.000 1.9375 5.75 1.75 NO96B 10542 108 36.000 NO108B 10544 *Special Pitch Diameter, used for calculating Center Distance only, not Ratio. †NO11B and NO12B have 4” Face.

P-1930-BG

9/17

A

FACE

PITCH DIA.

HUB PROJ.

BORE

HUB DIA.

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

4 D.P. 4 D.P.

D.P. 33D.P.

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 56, 57 Lubrication — 322 Materials — 323 Selection Procedure — 49

Boston Gear 800-825-6544

27

Change Gears 20 Diametral Pitch (Steel & Cast Iron) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

No. of Pitch Hub Catalog Item Teeth Dia. Dia. Number Code

A

No. of Pitch Hub Catalog Item Teeth Dia. Dia. Number Code

20 DIAMETRAL PITCH

.375 FACE

PITCH DIA.

1

1

(2) 8 × 16 KEYWAYS 180° APART

HUB DIA.

.625 BORE

REFERENCE PAGES

20 D.P. D.P. 20

Alterations — 322 Horsepower Ratings — 51 Lubrication — 322 Materials — 323 Selection Procedure — 49

COMPOUND STEEL BUSHINGS These steel bushings have 2 keys, 180° apart and fit bores of GA series change gears with a slip fit. They are used to mount two gears on one shaft (or stud) and drive one from the other. .4370 .4380

.125

.737 .733

.625

.750



20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50



51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70

STEEL 1.000 GA20 1.050 GA21 1.100 GA22 1.150 GA23 1.200 GA24 1.250 GA25 1.300 GA26 1.350 GA27 1.400 GA28 1.450 GA29 1.500 GA30 1.550 GA31 1.600 GA32 1.650 GA33 1.700 – GA34 1.750 GA35 1.800 GA36 1.850 GA37 1.900 GA38 1.950 GA39 2.000 GA40 2.050 GA41 2.100 GA42 2.150 GA43 2.200 GA44 2.250 GA45 2.300 GA46 2.350 GA47 2.400 GA48 2.450 GA49 2.500 GA50 CAST IRON 2.550 GA51B 2.600 GA52B 2.650 GA53B 2.700 GA54B 2.750 GA55B 2.800 GA56B 2.850 GA57B 2.900 1.38 GA58B 2.950 GA59B 3.000 GA60B 3.050 GA61B 3.100 GA62B 3.150 GA63B 3.200 GA64B 3.250 GA65B 3.300 GA66B 3.350 1.56 GA67B 3.400 GA68B 3.450 GA69B 3.500 GA70B

Outside Dia. = Pitch Dia. +.100” 10038 10040 10042 10044 10046 10048 10050 10052 10054 10056 10058 10060 10062 10064 10066 10068 10070 10072 10074 10076 10078 10080 10082 10084 10086 10088 10090 10092 10094 10096 10098 10802 10804 10806 10808 10810 10812 10814 10816 10818 10820 10822 10824 10826 10828 10830 10832 10834 10836 10838 10840



71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120

CAST IRON 3.550 GA71B 3.600 GA72B 3.650 GA73B 3.700 GA74B 3.750 1.56 GA75B 3.800 GA76B 3.850 GA77B 3.900 GA78B 3.950 GA79B 4.000 GA80B 4.050 GA81B 4.100 GA82B 4.150 GA83B 4.200 GA84B 4.250 GA85B 4.300 GA86B 4.350 GA87B 4.400 GA88B 4.450 GA89B 4.500 GA90B 4.550 GA91B 4.600 GA92B 4.650 GA93B 4.700 GA94B 4.750 GA95B 4.800 GA96B 4.850 GA97B 4.900 1.69 GA98B 4.950 GA99B 5.000 GA100B 5.050 GA101B 5.100 GA102B 5.150 GA103B 5.200 GA104B 5.250 GA105B 5.300 GA106B 5.350 GA107B 5.400 GA108B 5.450 GA109B 5.500 GA110B 5.550 GA111B 5.600 GA112B 5.650 GA113B 5.700 GA114B 5.750 GA115B 5.800 GA116B 5.850 GA117B 5.900 GA118B 5.950 GA119B 6.000 GA120B

Style See Page 323

10842 10844 10846 10848 10850 10852 10854 10856 10858 10860 10862 10864 10866 10868 10870 10872 10874 10876 10878 10880 10882 10884 10886 10888 10890 10892 10894 10896 10898 10900 10902 10904 10906 10908 10910 10912 10914 10916 10918 10920 10922 10924 10926 10928 10930 10932 10934 10936 10938 10940

20 – 78 Teeth – A 79 – 120 Teeth – C

ORDER BY CATALOG NUMBER OR ITEM CODE

CATALOG NO.

ITEM CODE

GAB20A

18500

28

Boston Gear 800-825-6544

P-1930-BG

9/17

Change Gears 16 Diametral Pitch (Steel & Cast Iron) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

No. of Pitch Hub Catalog Item Teeth Dia. Dia. Number Code 16 DIAMETRAL PITCH 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75

STEEL 1.250 GB20 10100 1.313 GB21 10102 1.375 GB22 10104 1.438 GB23 10106 1.500 GB24 10108 1.563 GB25 10110 1.625 GB26 10112 1.688 GB27 10114 1.750 GB28 10116 1.813 GB29 10118 1.875 – GB30 10120 1.938 GB31 10122 2.000 GB32 10124 2.063 GB33 10126 2.125 GB34 10128 2.188 GB35 10130 2.250 GB36 10132 2.313 GB37 10134 2.375 GB38 10136 2.438 GB39 10138 2.500 GB40 10140 CAST IRON 2.563 GB41B 10942 2.625 GB42B 10944 2.688 GB43B 10946 2.750 GB44B 10948 2.913 GB45B 10950 2.875 GB46B 10952 2.938 1.56 GB47B 10954 3.000 GB48B 10956 3.063 GB49B 10958 3.125 GB50B 10960 3.188 GB51B 10962 3.250 GB52B 10964 3.313 GB53B 10966 3.375 GB54B 10968 3.438 GB55B 10970 3.500 GB56B 10972 3.563 GB57B 10974 3.625 GB58B 10976 3.688 GB59B 10978 3.750 GB60B 10980 3.813 GB61B 10982 3.875 GB62B 10984 3.938 GB63B 10986 4.000 1.81 GB64B 10988 4.063 GB65B 10990 4.125 GB66B 10992 4.188 GB67B 10994 4.250 GB68B 10996 4.313 GB69B 10998 4.375 GB70B 11000 4.438 GB71B 11002 4.500 GB72B 11004 4.563 GB73B 11006 4.625 GB74B 11008 4.688 GB75B 11010

No. of Pitch Hub Catalog Item Teeth Dia. Dia. Number Code

A

Outside Dia. = Pitch Dia. +.125” 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128

CAST IRON 4.750 GB76B 11012 4.813 GB77B 11014 4.875 GB78B 11016 4.938 GB79B 11018 5.000 GB80B 11020 5.063 GB81B 11022 5.125 GB82A 11024 5.188 GB83A 11026 5.250 GB84A 11028 5.313 GB85A 11030 5.375 GB86A 11032 5.438 GB87A 11034 5.500 GB88A 11036 5.563 GB89A 11038 5.625 GB90A 11040 5.688 GB91A 11042 5.750 GB92A 11044 5.813 GB93A 11046 5.875 GB94A 11048 5.938 GB95A 11050 6.000 GB96A 11052 6.063 GB97A 11054 6.125 GB98A 11056 6.188 GB99A 11058 6.250 GB100A 11060 6.313 1.81 GB101A 11062 6.375 GB102A 11064 6.438 GB103A 11066 6.500 GB104A 11068 6.563 GB105A 11070 6.625 GB106A 11072 6.688 GB107A 11074 6.750 GB108A 11076 6.913 GB109A 11078 6.975 GB110A 11080 6.938 GB111A 11082 7.000 GB112A 11084 7.063 GB113A 11086 7.125 GB114A 11088 7.188 GB115A 11090 7.250 GB116A 11092 7.313 GB117A 11094 7.375 GB118A 11096 7.438 GB119A 11098 7.500 GB120A 11100 7.563 GB121A 11102 7.625 GB122A 11104 7.688 GB123A 11106 7.750 GB124A 11108 7.813 GB125A 11110 7.875 GB126A 11112 7.938 GB127A 11114 8.000 GB128A 11116

Style See Page 323

PITCH DIA.

9/17

HUB DIA.

.750 BORE

REFERENCE PAGES

16 D.P. D.P.

Alterations — 322 Horsepower Ratings — 52 Lubrication — 322 Materials — 323 Selection Procedure — 49

COMPOUND STEEL BUSHINGS These steel bushings have 2 keys, 180° apart and fit bores of GB series change gears with a slip fit. They are used to mount two gears on one shaft (or stud) and drive one from the other. .4995 .5005

.188

.914 .910

20 – 79 Teeth – A

.750

1.000

80 – 128 Teeth – C

ORDER BY CATALOG NUMBER OR ITEM CODE

P-1930-BG

3 3 (2) × KEYWAYS 16 32 180° APART

.500 FACE

CATALOG NO.

ITEM CODE

GBB16A

18502

Boston Gear 800-825-6544

29

Change Gears 12 Diametral Pitch (Steel & Cast Iron) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

No. of Pitch Hub Catalog Item Teeth Dia. Dia. Number Code

A

12 DIAMETRAL PITCH

1 1 (2) – × – KEYWAYS 4 8 180° APART

.750 FACE

PITCH DIA.

HUB DIA.

1.000 BORE

REFERENCE PAGES

12 12 D.P. D.P.

Alterations — 322 Horsepower Ratings — 53 Lubrication — 322 Materials — 323 Selection Procedure — 49

Compound Steel Bushings These steel bushings have 2 keys, 180° apart and fit bores of GD series change gears with a slip fit. They are used to mount two gears on one shaft (or stud) and drive one from the other. .7495 .7505

.250 1.217 1.213

1.000

1.50

20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74

STEEL 1.667 GD20 10142 1.750 GD21 10144 1.833 GD22 10146 1.917 GD23 10148 2.000 GD24 10150 2.083 GD25 10152 2.167 GD26 10154 2.250 GD27 10156 2.333 – GD28 10158 2.417 GD29 10160 2.500 GD30 10162 2.583 GD31 10164 2.667 GD32 10166 2.750 GD33 10168 2.833 GD34 10170 2.917 GD35 10172 3.000 GD36 10174 CAST IRON 3.083 GD37B 11118 3.167 GD38B 11120 3.250 GD39B 11122 3.333 GD40B 11124 3.417 GD41B 11126 3.500 1.76 GD42B 11128 3.583 GD43B 11130 3.667 GD44B 11132 3.750 GD45B 11134 3.833 GD46B 11136 3.917 GD47B 11138 4.000 GD48B 11140 4.083 GD49B 11142 4.167 GD50B 11144 4.250 GD51B 11146 4.333 GD52B 11148 4.417 GD53B 11150 4.500 GD54B 11152 4.583 GD55B 11154 4.667 GD56B 11156 4.750 GD57B 11158 4.833 GD58B 11160 4.917 GD59B 11162 5.000 GD60B 11164 5.083 2.19 GD61B 11166 5.167 GD62B 11168 5.250 GD63A 11170 5.333 GD64A 11172 5.417 GD65A 11174 5.500 GD66A 11176 5.583 GD67A 11178 5.667 GD68A 11180 5.750 GD69A 11182 5.833 GD70A 11184 5.917 GD71A 11186 6.000 GD72A 11188 6.083 GD73A 11190 6.167 GD74A 11192

No. of Pitch Hub Catalog Item Teeth Dia. Dia. Number Code Outside Dia. = Pitch Dia. +.167” 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120

CAST IRON 6.250 GD75A 11194 6.333 GD76A 11196 6.417 GD77A 11198 6.500 GD78A 11200 6.583 2.19 GD79A 11202 6.667 GD80A 11204 6.750 GD81A 11206 6.833 GD82A 11208 6.917 GD83A 11210 7.000 GD84A 11212 7.083 GD85A 11214 7.167 GD86A 11216 7.250 GD87A 11218 7.333 GD88A 11220 7.417 GD89A 11222 7.500 GD90A 11224 7.583 GD91A 11226 7.667 GD92A 11228 7.750 GD93A 11230 7.833 GD94A 11232 7.917 GD95A 11234 8.000 GD96A 11236 8.083 GD97A 11238 8.167 GD98A 11240 8.250 GD99A 11242 8.333 2.44 GD100A 11244 8.417 GD101A 11246 8.500 GD102A 11248 8.583 GD103A 11250 8.667 GD104A 11252 8.750 GD105A 11254 8.833 GD106A 11256 8.917 GD107A 11258 9.000 GD108A 11260 9.083 GD109A 11262 9.167 GD110A 11264 9.250 GD111A 11266 9.333 GD112A 11268 9.417 GD113A 11270 9.500 GD114A 11272 9.583 GD115A 11274 9.667 GD116A 11276 9.750 GD117A 11278 9.833 GD118A 11280 9.917 GD119A 11282 10.000 GD120A 11284

Style See Page 323

20 – 60 Teeth – A 61 – 120 Teeth – C

ORDER BY CATALOG NUMBER OR ITEM CODE

CATALOG NO.

ITEM CODE

GDB12A

18504

30

Boston Gear 800-825-6544

P-1930-BG

9/17

Change Gears 10 Diametral Pitch (Steel & Cast Iron) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

No. of Pitch Hub Catalog Item Teeth Dia. Dia. Number Code 10 DIAMETRAL PITCH STEEL 2.000 GF20 2.100 GF21 2.200 GF22 2.300 GF23 2.400 GF24 2.500 – GF25 2.600 GF26 2.700 GF27 2.800 GF28 2.900 GF29 3.000 GF30 CAST IRON 31 3.100 GF31B 32 3.200 GF32B 33 3.300 GF33B 34 3.400 GF34B 35 3.500 GF35B 36 3.600 1.94 GF36B 37 3.700 GF37B 38 3.800 GF38B 39 3.900 GF39B 40 4.000 GF40B 41 4.100 GF41B 42 4.200 GF42B 43 4.300 GF43B 44 4.400 GF44B 45 4.500 GF45B 46 4.600 GF46B 47 4.700 GF47B 48 4.800 2.68 GF48B 49 4.900 GF49B 50 5.000 GF50B 51 5.100 GF51B 52 5.200 GF52A 53 5.300 GF53A 54 5.400 GF54A 55 5.500 GF55A 56 5.600 GF56A 57 5.700 GF57A 58 5.800 3.12 GF58A 59 5.900 GF59A 60 6.000 GF60A

20 21 22 23 24 25 26 27 28 29 30

No. of Pitch Hub Catalog Item Teeth Dia. Dia. Number Code

A

Outside Dia. = Pitch Dia. +.200” 10176 10178 10180 10182 10184 10186 10188 10190 10192 10194 10196 11286 11288 11290 11292 11294 11296 11298 11300 11302 11304 11306 11308 11310 11312 11314 11316 11318 11320 11322 11324 11326 11328 11330 11332 11334 11336 11338 11340 11342 11344

61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

CAST IRON 6.100 GF61A 11346 6.200 GF62A 11348 6.300 GF63A 11350 6.400 GF64A 11352 6.500 GF65A 11354 6.600 GF66A 11356 6.700 GF67A 11358 6.800 GF68A 11360 6.900 GF69A 11362 7.000 GF70A 11364 7.100 GF71A 11366 7.200 GF72A 11368 7.300 GF73A 11370 7.400 GF74A 11372 7.500 GF75A 11374 7.600 GF76A 11376 7.700 GF77A 11378 7.800 GF78A 11380 7.900 GF79A 11382 8.000 GF80A 11384 8.100 3.12 GF81A 11386 8.200 GF82A 11388 8.300 GF83A 11390 8.400 GF84A 11392 8.500 GF85A 11394 8.600 GF86A 11396 8.700 GF87A 11398 8.800 GF88A 11400 8.900 GF89A 11402 9.000 GF90A 11404 9.100 GF91A 11406 9.200 GF92A 11408 9.300 GF93A 11410 9.400 GF94A 11412 9.500 GF95A 11414 9.600 GF96A 11416 9.700 GF97A 11418 9.800 GF98A 11420 9.900 GF99A 11422 10.000 GF100A 11424

Style See Page 323

5 5 × KEYWAYS 16 32 180° APART

1.000" FACE

PITCH DIA.

(2)

HUB DIA.

1.250 BORE

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 54 Lubrication — 322 Materials — 323 Selection Procedure — 49

10 D.P. 10 D.P.

Compound Steel Bushings These steel bushings have 2 keys, 180° apart and fit bores of GF series change gears with a slip fit. They are used to mount two gears on one shaft (or stud) and drive one from the other.

20 – 60 Teeth – A 61 – 66 Teeth – B 67 – 100 Teeth – C

.9995 1.0005

.313

1.523 1.519

1.250

2.000

ORDER BY CATALOG NUMBER OR ITEM CODE

P-1930-BG

9/17

CATALOG NO.

ITEM CODE

GFB10A

18506

Boston Gear 800-825-6544

31

Change Gears 8 Diametral Pitch (Steel & Cast Iron) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

No. of Pitch Hub Catalog Item Teeth Dia. Dia. Number Code

A

No. of Pitch Hub Catalog Item Teeth Dia. Dia. Number Code

8 DIAMETRAL PITCH STEEL 2.500 – GH20 10198 2.625 – GH21 10200 2.750 – GH22 10202 2.875 – GH23 10204 3.000 – GH24 10206 CAST IRON 25 3.125 GH25B 11426 26 3.250 GH26B 11428 27 3.375 GH27B 11430 28 3.500 GH28B 11432 29 3.625 GH29B 11434 30 3.750 2.06 GH30B 11436 31 3.875 GH31B 11438 32 4.000 GH32B 11440 33 4.125 GH33B 11442 34 4.250 GH34B 11444 35 4.375 GH35B 11446 36 4.500 GH36B 11448 37 4.625 GH37B 11450 38 4.750 GH38B 11452 39 4.875 GH39B 11454 40 5.000 GH40B 11456 41 5.125 2.69 GH41A 11458 42 5.250 GH42A 11460 43 5.375 GH43A 11462 44 5.500 GH44A 11464 45 5.625 GH45A 11466 46 5.750 GH46A 11468 47 5.875 GH47A 11470 48 6.000 GH48A 11472 49 6.125 GH49A 11474 50 6.250 GH50A 11476 51 6.375 GH51A 11478 52 6.500 3.12 GH52A 11480 53 6.625 GH53A 11482 54 6.750 GH54A 11484 55 6.875 GH55A 11486 56 7.000 GH56A 11488 57 7.125 GH57A 11490 58 7.250 GH58A 11492 59 7.375 3.25 GH59A 11494 60 7.500 GH60A 11496 20 21 22 23 24

3 3 (2) 8 × 16 KEYWAYS 180° APART

1.250 FACE PITCH DIA. HUB DIA.

1.375 BORE

REFERENCE PAGES

88 D.P. D.P.

Alterations — 322 Horsepower Ratings — 55 Lubrication — 322 Materials — 323 Selection Procedure — 49

Compound Steel Bushings These steel bushings have 2 keys, 180° apart and fit bores of GH series change gears with a slip fit. They are used to mount two gears on one shaft (or stud) and drive one from the other.

1.1245 1.1255

Outside Dia. = Pitch Dia. +.250” 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100



CAST IRON 7.625 GH61A 11498 7.750 GH62A 11500 7.875 GH63A 11502 8.000 GH64A 11504 8.125 GH65A 11506 8.250 GH66A 11508 8.375 GH67A 11510 8.500 GH68A 11512 8.625 GH69A 11514 8.750 3.25 GH70A 11516 8.875 GH71A 11518 9.000 GH72A 11520 9.125 GH73A 11522 9.250 GH74A 11524 9.375 GH75A 11526 9.500 GH76A 11528 9.625 GH77A 11530 9.750 GH78A 11532 9.875 GH79A 11534 10.000 GH80A 11536 10.125 GH81A 11538 10.250 GH82A 11540 10.375 GH83A 11542 10.500 GH84A 11544 10.625 GH85A 11546 10.750 GH86A 11548 10.875 GH87A 11550 11.000 GH88A 11552 11.125 3.75 GH89A 11554 11.250 GH90A 11556 11.375 GH91A 11558 11.500 GH92A 11560 11.625 GH93A 11562 11.750 GH94A 11564 11.875 GH95A 11566 12.000 GH96A 11568 12.125 GH97A 11570 12.250 GH98A 11572 12.375 GH99A 11574 12.500 GH100A 11576

Style See Page 323

20 – 49 Teeth – A 50 – 57 Teeth – B 58 – 68 Teeth – C 69 – 100 Teeth – D

.375 1.698 1.694

1.375

2.50

ORDER BY CATALOG NUMBER OR ITEM CODE

CATALOG NO.

ITEM CODE

GHB8A

18508

32

Boston Gear 800-825-6544

P-1930-BG

9/17

Stem Pinions 20 through 6 Diametral Pitch (Steel) 14-1/2° Pressure Angle (will not operate with 20° spurs) Boston Gear Stem Pinions feature small numbers of teeth cut integral on a steel shaft. Undercutting of the teeth is minimized by the use of special enlarged Pitch Diameters. When run with standard stock spur gears, they provide high ratios not normally found in spur gear drives. They are not intended to be operated with each other, with internal gears or with 11 tooth pinions, but will run satisfactorily with all other standard 141⁄2° Pressure Angle spur gears.

A

ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

No. of Teeth

Pitch Stem Stem Overall Catalog Item Dia.* Dia. Length Length Number Code

20 DIAMETRAL PITCH

5 6 8 10

.287 .335 .430 .525

FACE = 1.125” .375 .375 .500 .625

2.875 2.875 3.375 3.375

4.500 NAR5 09654 4.500 NAR6 09656 5.000 NAR8 09658 5.000 NAR10 09660

16 DIAMETRAL PITCH

FACE = 1.375”

5 6 8 10

NBR5 09696 NBR6 09698 NBR8 09700 NBR10 09702

.359 .419 .537 .656

.4375 .500 .625 .750

3.125 3.125 3.375 3.375

5.000 5.000 5.250 5.250

12 DIAMETRAL PITCH

FACE = 2.000”

5 6 7 8 10

NDR5 09734 NDR6 09736 NDR7 09738 NDR8 09740 NDR10 09742

.479 .625 .558 .625 .637 .750 .716 .875 .875 1.000

4.375 4.375 4.375 4.375 4.375

7.250 7.250 7.250 7.250 7.250

10 DIAMETRAL PITCH

FACE = 2.250”

5 6 7 8 10

NFR5 09768 NFR6 09770 NFR7 09772 NFR8 09774 NFR10 09776

.575 .750 .670 .750 .765 .875 .860 1.000 1.050 1.125

4.375 4.375 4.375 4.375 4.375

7.500 7.500 7.500 7.500 7.500

8 DIAMETRAL PITCH

FACE = 2.500”

5 6 7 8 10

NHR5 09796 NHR6 09798 NHR7 09800 NHR8 09802 NHR10 09804

.718 .837 .956 1.075 1.312

.875 1.000 1.125 1.125 1.500

4.375 4.375 4.375 4.375 4.375

7.750 7.750 7.750 7.750 7.750

6 DIAMETRAL PITCH

FACE = 3.000”

5 6 8 10

NJR5 09822 NJR6 09824 NJR8 09826 NJR10 09828

.958 1.116 1.433 1.750

1.250 1.375 1.625 2.000

4.375 4.375 5.000 5.375

8.500 8.500 9.000 9.500

PITCH DIA (SPL)

OVERALL LENGTH FACE

STEM LENGTH STEM DIA

STANDARD TOLERANCES DIMENSION STEM DIA. All

TOLERANCE +.0000 – .0015

*Used for calculating Center Distance, not ratio.

P-1930-BG

9/17

Boston Gear 800-825-6544

33

Drawn Pinion Wire 48, 32 and 24 Diametral Pitch (Brass & Steel) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

No. of Teeth

A

Pitch Dia.

Catalog Number

Item Code

48 DIAMETRAL PITCH

Drawn Pinion Wire, teeth not generated. All Pinion Wire is stocked in 4 foot pieces. Other lengths can be furnished on special order. Price on application.

6 8 9 10 12 14 15 16 18 6 8 9 10 12 14 15 16 18

BRASS .125 G24 .167 G25 .188 G26 .208 G27 .250 G29 .292 G30 .312 G31 .333 G32 .375 G33 STEEL .125 GS24 .167 GS25 .188 GS26 .208 GS27 .250 GS29 .292 GS30 .312 GS31 .333 GS32 .375 GS33

32 DIAMETRAL  PITCH 6 8 9 10 11 12 14 15 16 6 8 9 10 11 12 14 15 16

BRASS .188 G39 .250 G40 .281 G41 .312 G42 .344 G43 .375 G44 .438 G45 .469 G46 .500 G47 STEEL .188 GS39 .250 GS40 .281 GS41 .312 GS42 .344 GS43 .375 GS44 .438 GS45 .469 GS46 .500 GS47

24 DIAMETRAL PITCH 6 9 10 12 14 15 16 6 8 9 10 11 12 14 15 16

34

Boston Gear 800-825-6544

BRASS .250 G54 .375 G56 .417 G57 .500 G59 .583 G60 .625 G61 .667 G62 STEEL .250 GS54 .333 GS55 .375 GS56 .417 GS57 .458 GS58 .500 GS59 .583 GS60 .625 GS61 .667 GS62

36900 36902 36904 36906 36908 36910 36912 36914 36916 36954 36956 36958 36960 36962 36964 36966 36968 36970

36918 36920 36922 36924 36926 36928 36930 36932 36934 36972 36974 36976 36978 36980 36982 36984 36986 36988

36936 36940 36942 36946 36948 36950 36952 36990 36992 36994 36996 36998 37000 37002 37004 37006

P-1930-BG

9/17

Rack 48 through 3 Diametral Pitch (Nylon & Steel) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Pitch Nom- Mating Nylon Steel Overall Line inal Spur Thick- to Back Length Gear Catalog Item Catalog Item ness (B) (Feet) Page # Number Code Number Code 48 DIAMETRAL PITCH FACE WIDTH = .125”

A

1 GP586-1 53899 – – .125 .104 18 2 – – L501-2 12726 32 DIAMETRAL PITCH FACE WIDTH = .188” 1 GP583-1 53900 – – .188 .156 2 18, 19 – – L503-2 12728 4 – – L503-4 12730 24 DIAMETRAL PITCH FACE WIDTH = .250” 1 GP579-1 53901 – – .250 .208 2 19, 20 – – L505-2 12732 4 – – L505-4 12734 20 DIAMETRAL PITCH FACE WIDTH = .375” 2 .375 .325 4 20, 21 6 16 DIAMETRAL PITCH

– – –

– L509-2 12736 – L509-4 12738 – L509-6 12740 *FACE WIDTH = .313”

2 21, 22 .313 .250 4 16 DIAMETRAL PITCH

– –

– L510-2 12742 – L510-4 12744 *FACE WIDTH = .500”

4 21, 22 .500 .438 6 12 DIAMETRAL PITCH

– –

– L512-4 12746 – L512-6 12748 FACE WIDTH = .750”

4 .500 .417 6 22, 23 .750 .667 4 6 10 DIAMETRAL PITCH

– – – –

– L514-4 12750 – L514-6 12752 – L515-4 12754 – L515-6 12756 FACE WIDTH = 1.000”

4 .625 .525 6 23, 24 4 1.000 .900 6 8 DIAMETRAL PITCH

– – – –

– L516-4 37324 – L516-6 37326 – L517-4 37328 – L517-6 37330 FACE WIDTH = 1.250”

4 .750 .625 6 24, 25 4 1.250 1.125 6 6 DIAMETRAL PITCH

– – – –

– L518-4 37332 – L518-6 37334 – L519-4 37336 – L519-6 37338 FACE WIDTH = 1.500”

4 1.000 .833 6 25, 26 4 1.500 1.333 6 5 DIAMETRAL PITCH

– – – –

– L520-4 37340 – L520-6 37342 – L521-4 37344 – L521-6 37346 FACE WIDTH = 1.750”

4 1.250 1.050 26 6 4 DIAMETRAL PITCH

– –

– L522-4 37348 – L522-6 37350 FACE WIDTH = 2.000”

4 1.500 1.250 27 6 3 DIAMETRAL PITCH

– –

– L523-4 37352 – L523-6 37354 FACE WIDTH = 3.000”

4 1.500 1.167 27 6

– –

– –

*Face Width of L512-4 and L512-6 = 1/2”.

P-1930-BG

9/17

L524-4 37356 L524-6 37358

PITCH LINE TO BACK (B)

WIDTH

OVERALL THICKNESS

LENGTH

STANDARD TOLERANCES ‡ DIMENSION LENGTH† All 1/8 – 3/4 FACE 1 – 1-1/2 WIDTH 1-3/4 – 2 3

TOLERANCE + 1.00 – .000 + .000 – .002 + .000 – .003 + .000 – .004 + .000 – .006

†Ends not machined. Tolerance allows for c ­ utting and matching. Nylon Rack is molded in proper lengths to permit end to end butting w ­ ithout interruption of tooth spacing. ‡Steel only.

PITCH DIA OF GEAR (D)

GEAR CENTER LINE TO BACK OF RA B+D 2

FACE WIDTH CK

OVERALL THICKNESS

LENGTH PITCH LINE TO BACK (B)

REFERENCE PAGES Alterations — 322 Lubrication — 322 Materials — 323

Boston Gear 800-825-6544

35

Internal Gears 48 through 16 Diametral Pitch (Brass) 14-1/2° Pressure Angle (will not operate with 20° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE



A

No. of Teeth

Pitch Dia. O.D. I.D.

Catalog Number

48 DIAMETRAL PITCH 48 72 96 144

1.000 1.500 2.000 3.000

FACE = .125” 1.500 2.000 2.750 3.750

.986 1.486 1.986 2.986

G632 G633 G635 G637

2.000 2.750 3.750 4.750 6.750

1.480 1.980 2.980 3.980 5.980

G664 G666 G668 G669 G670

2.250 2.750 3.750 4.750 6.750

1.474 1.974 2.974 3.974 5.974

G675 G677 G679 G680 G681

2.750 3.750 4.750 6.750

1.962 2.962 3.962 5.962

G689 G691 G692 G693

32 DIAMETRAL PITCH 48 64 96 128 192

FACE

1.500 2.000 3.000 4.000 6.000

PITCH DIA.

INSIDE DIA.

36 48 72 96 144

1.500 2.000 3.000 4.000 6.000

DIMENSION 48 Pitch All I.D. 32 Pitch All 24 Pitch All 16 Pitch All O.D. All

TOLERANCE +.004 – .000 +.005 – .000 +.006 – .000 +.008 – .000 +.001 + .003

32 48 64 96

2.000 3.000 4.000 6.000

12056 12058 12060 12062 12064

FACE = .250”

16 DIAMETRAL PITCH

STANDARD TOLERANCES

12066 12068 12070 12072

FACE = .188”

24 DIAMETRAL PITCH OUTSIDE DIA.

Item Code

12046 12048 12050 12052 12054

FACE = .313” 12038 12040 12042 12044

PINION PITCH DIA. (d) CENTER DISTANCE

GEAR PITCH DIA. (D)

CENTER = D – d DISTANCE 2

NOTE: The difference in tooth numbers between Gear and Pinion should not be less than 15.

36

Boston Gear 800-825-6544

P-1930-BG

9/17

Spur Gears 64 and 48 Diametral Pitch (Delrin & Brass) 20° Pressure Angle (will not operate with 14-1/2­­° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Without Keyway Style Hub or Setscrew No. See of Pitch Page Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code 64 DIAMETRAL PITCH

A

Face = .125” Outside Dia. = Pitch Dia. + .033” Overall Length = .125” + Hub Proj. BRASS

16 .250 .19 Y6416 09482 18 .281 .22 Y6418 09484 20 .312 .125 .25 .19 Y6420 09486 24 .375 .28 Y6424 09488 28 .438 .34 Y6428 09490 32 .500 .38 Y6432 09492 36 .562 .44 Y6436 09494 40 .625 .44 Y6440 09496 44 .688 .1875 .50 .25 A Y6444 09498 48 .750 .50 Y6448 09500 52 .812 .56 Y6452 09502 56 .875 .56 Y6456 09504 60 .938 .62 Y6460 09506 64 1.000 .62 Y6464 09508 72 1.125 .69 Y6472 09510 80 1.250 .69 Y6480 09512 88 1.375 .250 .75 .25 Y6488 09514 96 1.500 .75 Y6496 09516 112 1.750 .81 Y64112 09518 128 2.000 .88 Y64128 09520 144 2.250 .75 Y64144 09522 160 2.500 .3125 .75 .31 C Y64160 09524 192 3.000 .88 Y64192 09526 Face = .125” 48 Outside Dia. = Pitch Dia. + .042” DIAMETRAL PITCH Overall Length = .125” + Hub Proj. MOLDED DELRIN 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 42

P-1930-BG

.375 .31 .396 .417 .34 .438 .458 .38 .479 .500 .1562 .41 .25 .521 .542 .45 .562 .583 .48 .604 .625 .50 A .646 .667 .688 .708 .729 .750 .1875 .55 .25 .771 .792 .813 .833 .875

9/17

YP4818 53902 YP4819 53903 YP4820 53904 YP4821 53905 YP4822 53906 YP4823 53907 YP4824 53908 YP4825 53909 YP4826 53910 YP4827 53911 YP4828 53912 YP4829 53913 YP4830 53914 YP4831 53915 YP4832 53916 YP4833 53917 YP4834 53918 YP4835 53919 YP4836 53920 YP4837 53921 YP4838 53922 YP4839 53923 YP4840 53924 YP4842 53925

HUB PROJ.

FACE

PITCH DIA.

HUB DIA.

BORE

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

48 D.P.

48 D.P.

48 64D.P. DP

64 DP

64 D.P.

REFERENCE PAGES Alterations — 322 Lubrication — 322 Materials — 323

Boston Gear 800-825-6544

37

Spur Gears 48 Diametral Pitch (Delrin) 20° Pressure Angle (will not operate with 14-1/2° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Without Keyway Style Hub or Setscrew † No. See of Pitch Page Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code

A

48 DIAMETRAL PITCH

Face = .125” Outside Dia. = Pitch Dia. + .042” Overall Length = .125” + Hub Proj. MOLDED DELRIN

HUB PROJ.

FACE

PITCH DIA.

HUB DIA.

BORE

OVERALL LENGTH

STANDARD TOLERANCES* DIMENSION BORE All

TOLERANCE +.001 – .000

*Gears with Brass Inserts only.

48 D.P.

48 D.P.

REFERENCE PAGES Alterations — 322 Materials — 323 †All YPB gears have setscrews.

BORE

SETSCREW

1/8 #2-56 3/16 #4-40 1/4

38

#6-32

Boston Gear 800-825-6544

44 45 48 52 54 56 60 64 66 72 80 84 96 100 108 120

.917 .188 .55 YP4844 53926 .938 YP4845 53927 1.000 YP4848 53928 1.083 YP4852 53929 1.125 YP4854 53930 1.168 YP4856 53931 1.250 YP4860 53932 1.333 .250 .61 .25 B YP4864 53933 1.375 YP4866 53934 1.500 YP4872 53935 1.667 YP4880 53936 1.750 YP4884 53937 2.000 YP4896 53938 2.083 YP48100 53939 2.250 YP48108 53940 2.500 YP48120 53941 MOLDED DELRIN WITH BRASS INSERTS

18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 42 44 45 48 52 54 56 60 64 66 72 80 84 96 100 108 120

.375 .31 .396 .417 .34 .438 .125 .458 .38 .479 .500 .40 .521 .542 .45 .562 .583 .48 .604 .625 .50 A .646 .667 .688 .708 .188 .729 .750 .771 .55 .25 .792 .813 .833 .875 .917 .938 1.000 1.083 1.125 1.168 1.250 1.333 1.375 .250 .61 B 1.500 1.667 1.750 2.000 2.083 2.250 2.500

YPB4818 53942 YPB4819 53943 YPB4820 53944 YPB4821 53945 YPB4822 53946 YPB4823 53947 YPB4824 53948 YPB4825 53949 YPB4826 53950 YPB4827 53951 YPB4828 53952 YPB4829 53953 YPB4830 53954 YPB4831 53955 YPB4832 53956 YPB4833 53957 YPB4834 53958 YPB4835 53959 YPB4836 53960 YPB4837 53961 YPB4838 53962 YPB4839 53963 YPB4840 53964 YPB4842 53965 YPB4844 53966 YPB4845 53967 YPB4848 53968 YPB4852 53969 YPB4854 53970 YPB4856 53971 YPB4860 53972 YPB4864 53973 YPB4866 53974 YPB4872 53975 YPB4880 53976 YPB4884 53977 YPB4896 53978 YPB48100 53979 YPB48108 53980 YPB48120 53981

P-1930-BG

9/17

Spur Gears 48 and 32 Diametral Pitch (Delrin & Brass) 20° Pressure Angle (will not operate with 14-1/2° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Without Keyway Style Hub or Setscrew No. See of Pitch Page Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code 48 DIAMETRAL PITCH

A

Face = .125” Outside Dia. = Pitch Dia. + .042” Overall Length = .125” + Hub Proj. BRASS

12 .250 .18 Y4812 09444 15 .312 .125 .22 .19 Y4815 09446 18 .375 .28 Y4818 09448 21 .438 .35 Y4821 09450 24 .500 .38 Y4824 09452 27 .562 .44 Y4827 09454 30 .625 .1875 .44 .25 Y4830 09456 36 .750 .50 A Y4836 09458 42 .875 .57 Y4842 09460 48 1.000 .63 Y4848 09462 54 1.125 .69 Y4854 09464 60 1.250 .69 Y4860 09466 66 1.375 .250 .75 .25 Y4866 09468 72 1.500 .75 Y4872 09470 84 1.750 .82 Y4884 09472 96 2.000 .88 Y4896 09474 120 2.500 .75 Y48120 09476 144 3.000 .3125 .88 .31 C Y48144 09478 192 4.000 1.00 Y48192 09480 Face = .188” 32 Outside Dia. = Pitch Dia. + .062” DIAMETRAL PITCH Overall Length = .188” + Hub Proj.

HUB PROJ.

FACE

PITCH DIA.

HUB DIA.

BORE

OVERALL LENGTH

MOLDED DELRIN 12 14 15 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 48 52 56 64 72 80 96

P-1930-BG

.375 .28 .438 .31 .469 .1562 .31 .31 .500 .34 .562 .625 .47 A .688 .50 .750 .1875 .31 .812 .56 .875 .50 .938 .56 1.000 .63 1.062 1.125 1.187 .250 .61 .31 1.250 1.312 1.375 1.500 .63 B 1.625 1.750 .67 2.000 .3125 .31 2.250 2.500 .81 3.000

9/17

YP3212 53982 YP3214 53983 YP3215 53984 YP3216 53985 YP3218 53986 YP3220 53987 YP3222 53988 YP3224 53989 YP3226 53990 YP3228 53991 YP3230 53992 YP3232 53993 YP3234 53994 YP3236 53995 YP3238 53996 YP3240 53997 YP3242 53998 YP3244 53999 YP3248 54000 YP3252 54001 YP3256 54002 YP3264 54003 YP3272 54004 YP3280 54005 YP3296 54006

STANDARD TOLERANCES* DIMENSION TOLERANCE BORE All ±.0005˜ *Brass only.

48 D.P.

48 D.P.

3248 D.P.D.P.

32 D.P.

32 D.P.

REFERENCE PAGES Alterations — 322 Lubrication — 322 Materials — 323

Boston Gear 800-825-6544

39

Spur Gears 32 Diametral Pitch (Delrin & Brass) 20° Pressure Angle (will not operate with 14-1/2° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Without Keyway Style Hub or Setscrew † No. See of Pitch Page Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code

A

32 DIAMETRAL PITCH

Face = .188” Outside Dia. = Pitch Dia. + .062” Overall Length = .188” + Hub Proj. MOLDED DELRIN with BRASS INSERTS

HUB PROJ.

FACE

PITCH DIA.

HUB DIA.

BORE

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE Brass BORE All ± .0005 Delrin with Brass Inserts BORE All + .001 – .000

32 D.P. 32 D.P.

REFERENCE PAGES Alterations — 322 Lubrication — 322 Materials — 323 †All YPB gears have setscrew and spot drill. BORE

12 14 15 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 48 52 56 64 72 80 96

.375 .28 .438 .31 .469 .125 .31 .500 .34 .562 .34 .625 .47 A .688 .50 .750 .50 .1875 .812 .56 .875 .50 .938 .56 1.000 .63 .31 1.062 .61 1.125 .61 1.187 .61 .250 1.250 .61 1.312 .61 1.375 .61 B 1.500 .63 1.625 .67 1.750 .67 2.000 .67 .3125 2.250 .81 2.500 .81 3.000 .81 BRASS

YPB3212 54007 YPB3214 54008 YPB3215 54009 YPB3216 54010 YPB3218 54011 YPB3220 54012 YPB3222 54013 YPB3224 54014 YPB3226 54015 YPB3228 54016 YPB3230 54017 YPB3232 54018 YPB3234 54019 YPB3236 54020 YPB3238 54021 YPB3240 54022 YPB3242 54023 YPB3244 54024 YPB3248 54025 YPB3252 54026 YPB3256 54027 YPB3264 54028 YPB3272 54029 YPB3280 54030 YPB3296 54031

12 14 16 18 20 24 28 32 36 40 48 56 64 72 80 96 112 128 160

.375 .28 Y3212 .125 .25 .438 .34 Y3214 .500 .40 Y3216 .562 .43 Y3218 .625 .1875 .47 .25 Y3220 .750 .53 Y3224 .875 .59 A Y3228 1.000 .66 Y3232 1.125 .72 Y3236 .250 .25 1.250 .72 Y3240 1.500 .78 Y3248 1.750 .84 Y3256 .25 2.000 .90 Y3264 2.250 .88 Y3272 2.500 .88 Y3280 .3125 3.000 1.00 Y3296 .31 C 3.500 1.00 Y32112 4.000 1.00 Y32128 5.000 1.00 Y32160

09406 09408 09410 09412 09414 09416 09418 09420 09422 09424 09426 09428 09430 09432 09434 09436 09438 09440 09442

SETSCREW

1/8 #2-56 3/16

#4-40

1/4

#6-32

5/16

#8-32

40

Boston Gear 800-825-6544

P-1930-BG

9/17

Spur Gears 24 Diametral Pitch (Delrin) 20° Pressure Angle (will not operate with 14-1/2° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Without Keyway Style Hub or Setscrew† No. See of Pitch Page Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code 24 DIAMETRAL PITCH

A

Face = .250” Outside Dia. = Pitch Dia. + .083” Overall Length = .250” + Hub Proj. MOLDED DELRIN

12 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 30 32 33 34 36 39 40 42 44 45 48 50 52 54 56 60

.500 .38 YP2412 54032 .583 .44 YP2414 54033 .625 .48 YP2415 54034 .667 YP2416 54035 .709 YP2417 54036 .750 .188 A YP2418 54037 .791 YP2419 54038 .833 .55 YP2420 54039 .875 YP2421 54040 .917 YP2422 54041 .959 YP2423 54042 1.000 .63 YP2424 54043 1.041 .61 YP2425 54044 1.083 YP2426 54045 1.125 .63 YP2427 54046 1.167 .250 YP2428 54047 1.250 .31 YP2430 54048 1.333 YP2432 54049 1.375 .61 YP2433 54050 1.416 YP2434 54051 1.500 .63 YP2436 54052 1.625 B YP2439 54053 1.666 YP2440 54054 1.750 YP2442 54055 1.833 YP2444 54056 1.875 YP2445 54057 2.000 .313 .67 YP2448 54058 2.083 YP2450 54059 2.166 YP2452 54060 2.250 YP2454 54061 2.333 YP2456 54062 2.500 YP2460 54063 MOLDED DELRIN WITH BRASS INSERTS

12 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 30 32 33 34 36 39 40 42

.500 .38 .583 .44 .625 .48 .667 .709 .750 .188 A .791 .833 .55 .875 .917 .959 .31 1.000 .63 1.041 .61 1.083 1.125 .63 1.167 .250 1.250 1.333 B 1.375 .61 1.416 1.500 .63 1.625 1.666 .313 .67 1.750

P-1930-BG

9/17

YPB2412 54064 YPB2414 54065 YPB2415 54066 YPB2416 54067 YPB2417 54068 YPB2418 54069 YPB2419 54070 YPB2420 54071 YPB2421 54072 YPB2422 54073 YPB2423 54074 YPB2424 54075 YPB2425 54076 YPB2426 54077 YPB2427 54078 YPB2428 54079 YPB2430 54080 YPB2432 54081 YPB2433 54082 YPB2434 54083 YPB2436 54084 YPB2439 54085 YPB2440 54086 YPB2442 54087

HUB PROJ.

FACE

PITCH DIA.

HUB DIA.

BORE

OVERALL LENGTH

STANDARD TOLERANCES* DIMENSION

BORE

All

TOLERANCE +.001 – .000

*Gears with Brass Inserts only.

24 D.P.

24 D.P. REFERENCE PAGES Alterations — 322 Materials — 323 †All YPB gears have setscrew and spot drill.

BORE

SETSCREW

3/16 #4-40 1/4

#6-32

5/16

#8-32



Boston Gear 800-825-6544

41

Spur Gears 24 and 20 Diametral Pitch (Delrin, Brass, Steel & Cast Iron) 20° Pressure Angle (will not operate with 14-1/2° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Style Without Keyway No. Hub or Setscrew See of Pitch Page Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code

A

With Keyway and Setscrew† Catalog Item Number Code

24 DIAMETRAL PITCH 44 45 48 50 52 54 56 60 HUB PROJ.

FACE

PITCH DIA.

HUB DIA.

BORE

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE Brass, Steel and Cast Iron BORE All ± .0005 Delrin with Brass Inserts BORE All + .001 – .000

24 D.P.

24 D.P.

24D.P. D.P. 20

20 D.P.

20 D.P.

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 58 Lubrication — 322 Materials — 323 Selection Procedure — 49 †YPB gears have one setscrew (#8-32), no keyway. *5/16” bore have #35 (.110) drilled hole through one wall, no keyway. ‡3/8” bore have one setscrew. No keyway. 1/2” bore and larger have standard keyway at 90° to setscrew. See Page 323.

42

Boston Gear 800-825-6544

Face = .250” Outside Dia. = Pitch Dia. + .083” Overall Length = .250” + Hub Proj. MOLDED DELRIN WITH BRASS INSERTS 1.833 YPB2444 54088 – – 1.875 YPB2445 54089 – – 2.000 YPB2448 54090 – – 2.083 .3125 .67 .31 B YPB2450 54091 – – 2.166 YPB2452 54092 – – 2.250 YPB2454 54093 – – 2.333 YPB2456 54094 – – 2.500 YPB2460 54095 – – BRASS .500 .38 Y2412 09372 – – .625 .1875 .50 .25 Y2415 09374 – – .750 .54 Y2418 09376 – – .875 .60 Y2421 09378 – – A 1.000 .66 Y2424 09380 – – 1.125 .250 .73 Y2427 09382 – – .25 1.250 .73 Y2430 09384 – – 1.500 .79 Y2436 09386 – – 1.750 .86 .25 Y2442 09388 – – 2.000 .3125 .92 Y2448 09390 – – 2.250 .88 .31 Y2454 09392 – – 2.500 .88 Y2460 09394 – – 3.000 Y2472 09396 – – 3.500 .31 C Y2484 09398 – – 4.000 .375 1.00 Y2496 09400 – – 5.000 Y24120 09402 – – .38 6.000 Y24144 09404 – –

12 15 18 21 24 27 30 36 42 48 54 60 72 84 96 120 144 Face = .500” 20 Outside Dia. = Pitch Dia. + .100” DIAMETRAL PITCH Overall Length = .500” + Hub Proj. STEEL 12 .600 .3125 .46 .44 YA12 09892 YA12-5/16* 46128 14 .700 .56 YA14 09894 YA14-5/16* 46129 15 .750 .60 YA15 09896 YA15-3/8‡ 46130 16 .800 .375 .66 .44 YA16 09898 YA16-3/8‡ 46131 18 .900 .74 YA18 09900 YA18-3/8‡ 46132 20 1.000 .84 YA20 09902 YA20-1/2 46133 24 1.200 .92 .44 YA24 09914 YA24-1/2 46134 25 1.250 .500 .97 A YA25 09904 YA25-1/2 46135 30 1.500 1.22 YA30 09906 YA30-1/2 46136 35 1.750 1.47 .50 YA35 09908 YA35-1/2 46137 .500 YA40 09910 YA40-1/2 46138 40 2.000 .625 1.72 .50 – – YA40-5/8 46139 .750 – – YA40-3/4 46140 45 2.250 1.97 YA45 09912 – – 50 2.500 .500 1.62 .50 YA50A 10548 – – 60 3.000 2.12 YA60A 10550 – – 70 3.500 2.38 YA70A 10552 – – CAST IRON 80 4.000 C YA80 10554 – – 84 4.200 .625 1.38 .62 B YA84 10556 – – 90 4.500 YA90 10558 – – C 100 5.000 YA100 10560 – – 120 6.000 .625 1.50 .62 YA120 10562 – – 140 7.000 YA140 10564 – – 160 8.000 D YA160 10566 – – 180 9.000 .625 1.75 .75 YA180 10568 – – 200 10.000 YA200 10570 – –

P-1930-BG

9/17

Spur Gears 16 and 12 Diametral Pitch (Steel & Cast Iron) 20° Pressure Angle (will not operate with 14-1/2° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Style Without Keyway No. Hub or Setscrew See of Pitch Page Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code 16 DIAMETRAL PITCH

With Keyway and Setscrew† Catalog Item Number Code

Face = .750” Outside Dia. = Pitch Dia. + .125” Overall Length = .750” + Hub Proj.

STEEL 12 .750 .375 .56 YB12 09916 YB12-3/8† 46141 .50 14 .875 .69 YB14 09918 YB14-3/8† 46142 15 .938 .375 .75 .50 YB15 09920 YB15-3/8† 45991 .500 – – YB15-1/2 46143 16 1.000 .500 .81 YB16 09922 YB16-1/2 46144 .50 18 1.125 .94 YB18 09924 YB18-1/2 46145 20 1.250 .625 1.05 .50 YB20 09926 YB20-5/8 46146 24 1.500 .625 1.20 .50 YB24 09928 YB24-5/8 46147 .750 – – YB24-3/4 46148 28 1.750 .625 1.45 .50 YB28 09930 YB28-5/8 46149 .750 – – YB28-3/4 46150 .625 YB30 09932 YB30-5/8 46151 30 1.875 .750 1.58 .50 – – YB30-3/4 46152 .875 A – – YB30-7/8 46153 .625 YB32 09934 YB32-5/8 46154 32 2.000 .750 1.70 .50 – – YB32-3/4 46155 .875 – – YB32-7/8 46156 1.000 – – YB32-1 46157 36 2.250 1.95 .50 YB36 09936 – – 40 2.500 2.20 YB40 09938 – – 48 3.000 .625 2.00 .62 YB48A 10572 – – 56 3.500 2.50 YB56A 10574 – – 60 3.750 2.75 YB60A 10576 – – 64 4.000 2.88 YB64A 10578 – – 72 4.500 .750 3.38 .75 YB72A 10580 – – 80 5.000 3.88 YB80A 10582 – – CAST IRON 96 6.000 1.75 YB96 10584 – – 128 8.000 .750 2.00 .75 YB128 10588 – – 144 9.000 2.00 D YB144 10590 – – 160 10.000 .875 2.00 .75 YB160 10592 – – 192 12.000 1.00 YB192 10594 – – Face = 1.000” 12 Outside Dia. = Pitch Dia. + .167” DIAMETRAL PITCH Overall Length = 1.000” + Hub Proj. STEEL 12 1.000 .500 .75 .62 YD12 09940 YD12-1/2* 46158 13 1.083 .83 YD13 09942 YD13-5/8‡ 46159 14 1.167 .625 .92 09944 YD14-5/8 46160 .62 YD14 15 1.250 .99 YD15 09946 YD15-5/8 46161 16 1.333 1.07 YD16 09948 YD16-5/8 46162 18 1.500 .750 1.24 .62 YD18 09950 YD18-3/4 46163 20 1.667 1.32 YD20 09952 YD20-3/4 46164 21 1.750 .750 1.40 .62 YD21 09954 YD21-3/4 46165 .875 – – YD21-7/8 46166 .750 YD24 09956 YD24-3/4 46167 24 2.000 .875 1.65 .62 A – – YD24-7/8 46168 1.000 – – YD24-1 46169 .750 YD28 09958 YD28-3/4 46170 28 2.333 .875 1.99 .62 – – YD28-7/8 46171 1.000 – – YD28-1 46172 30 2.500 2.15 .62 YD30 09960 – – 36 3.000 .750 1.94 .88 YD36A 10596 – – 42 3.500 2.44 YD42A 10598 – – 48 4.000 .875 2.88 .88 54 4.500 3.38

P-1930-BG

9/17

A

YD48A 10600 – – YD54A 10602 – –

HUB PROJ.

FACE

PITCH DIA.

BORE

HUB DIA.

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

16 D.P.

16 D.P. 12 D.P. 12 D.P. 12 D.P.

16 D.P.

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 58, 59 Lubrication — 322 Materials — 323 Selection Procedure — 49 †3/8” bore have one setscrew. No keyway. YB15-1/2 and larger have standard keyway at 90° to setscrew. See page 323. *YD12-1/2 has one setscrew. No keyway. ‡YD13-5/8 has one setscrew. No keyway. YD14-5/8 bore and larger have standard keyway at 90° to setscrew.

Boston Gear 800-825-6544

43

Spur Gears 12 and 10 Diametral Pitch (Cast Iron & Steel) 20° Pressure Angle (will not operate with 14-1/2° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Style Without Keyway No. Hub or Setscrew See of Pitch Page Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code

A

12 DIAMETRAL PITCH

HUB PROJ.

FACE

PITCH DIA.

BORE

HUB DIA.

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

12 D.P.

12 D.P. 10 D.P. 10 D.P.

12 D.P.

10 D.P.

With Keyway and Setscrew† Catalog Item Number Code

Face = 1.000” Outside Dia. = Pitch Dia. + .166” Overall Length = 1.000” + Hub Proj.

CAST IRON 60 5.000 B YD60 10604 – – 66 5.500 YD66 10606 – – 72 6.000 .875 2.12 .88 YD72 10608 – – 84 7.000 YD84 10610 – – 96 8.000 YD96 10612 – – 108 9.000 2.25 YD108 10614 – – 120 10.000 2.25 .88 D YD120 10616 – – 132 11.000 YD132 10618 – – 144 12.000 1.000 2.50 1.00 YD144 10620 – – 168 14.000 YD168 10622 – – 192 16.000 YD192 10624 – – 216 18.000 2.75 YD216 10626 – – Face = 1.250” 10 Outside Dia. = Pitch Dia. + .200” DIAMETRAL PITCH Overall Length = 1.250” + Hub Proj. STEEL 12 1.200 .625 .92 YF12 09962 YF12-5/8 46173 .62 14 1.400 1.12 YF14 09964 YF14-5/8 46174 15 1.500 .750 1.22 .62 YF15 09966 YF15-3/4 46175 16 1.600 1.32 YF16 09968 YF16-3/4 46176 18 1.800 .750 1.42 .62 YF18 09970 YF18-3/4 46177 .875 – – YF18-7/8 46178 20 2.000 .875 1.62 .62 YF20 09972 YF20-7/8 46179 1.000 – – YF20-1 46180 24 2.400 .875 2.02 .62 A YF24 09974 YF24-7/8 46181 1.000 – – YF24-1 46182 25 2.500 .875 2.12 .62 YF25 09976 YF25-7/8 46183 1.000 – – YF25-1 46184 28 2.800 .875 2.42 .62 YF28 09978 YF28-7/8 46185 1.000 – – YF28-1 46186 30 3.000 .875 2.00 .88 YF30A 10630 – – 35 3.500 2.50 YF35A 10632 – – 40 4.000 2.95 YF40A 10634 – – 45 4.500 1.000 3.45 .88 YF45A 10636 – – 48 4.800 3.75 YF48A 10638 – – 50 5.000 3.95 YF50A 10640 – – CAST IRON 55 5.500 10642 – – B YF55 60 6.000 YF60 10644 – – 70 7.000 1.000 2.50 1.00 YF70 10646 – – 80 8.000 YF80 10648 – – 90 9.000 YF90 10650 – – 100 10.000 D YF100 10652 – – 120 12.000 YF120 10656 – – 3.00 1.12 140 14.000 1.125 YF140 10658 – – 160 16.000 YF160 10660 – – 200 20.000 3.25 1.25 YF200B 10664 – – †All gears have standard keyway at 90° to setscrew. See Page 323.

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 59, 60 Lubrication — 322 Materials — 323 Selection Procedure — 49

44

Boston Gear 800-825-6544

P-1930-BG

9/17

Spur Gears 8 and 6 Diametral Pitch (Steel & Cast Iron) 20° Pressure Angle (will not operate with 14-1/2° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Style Without Keyway No. Hub or Setscrew See of Pitch Page Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code 8 DIAMETRAL PITCH

With Keyway and Setscrew† Catalog Item Number Code

A

Face = 1.500” Outside Dia. = Pitch Dia. + .250” Overall Length = 1.500” + Hub Proj.

STEEL 12 1.500 .750 1.12 .75 YH12 09980 YH12-3/4 46187 14 1.750 1.31 YH14 09982 YH14-3/4 46188 15 1.875 .750 1.43 .75 YH15 09984 YH15-3/4 46189 .875 – – YH15-7/8 46190 16 2.000 .875 1.56 .88 YH16 09986 YH16-7/8 46191 1.000 – – YH16-1 46192 .875 YH18 09988 YH18-7/8 46193 18 2.250 1.000 1.81 .88 A – – YH18-1 46194 1.125 – – YH18-1-1/8 46195 .875 YH20 09990 YH20-7/8 46196 20 2.500 1.000 2.06 .88 – – YH20-1 46197 1.125 – – YH20-1-1/8 46198 .875 YH22 09992 YH22-7/8 46199 22 2.750 1.000 2.31 .88 – – YH22-1 46200 1.125 – – YH22-1-1/8 46201 .875 YH24 09994 YH24-7/8 46202 24 3.000 1.000 2.56 .88 – – YH24-1 46203 1.125 – – YH24-1-1/8 46204 28 3.500 .875 3.06 .88 YH28 09996 – – 32 4.000 1.000 3.00 .88 YH32C 10666 – – 36 4.500 3.50 YH36C 10668 – – CAST IRON 40 5.000 YH40B 10670 – – 44 5.500 B YH44B 10672 – – 48 6.000 YH48B 10674 – – 56 7.000 1.000 2.50 1.00 C YH56B 10676 – – 60 7.500 YH60 10678 – – 64 8.000 YH64B 10680 – – 72 9.000 YH72B 10682 – – 80 10.000 YH80B 10684 – – 88 11.000 3.00 D YH88B 10686 – – 96 12.000 1.125 1.25 YH96B 10688 – – 112 14.000 YH112B 10690 – – 120 15.000 3.25 YH120 10692 – – 128 16.000 YH128B 10694 – – Face = 2.000” 6 Outside Dia. = Pitch Dia. + .333” DIAMETRAL PITCH Overall Length = 2.000” + Hub Proj. STEEL 12 2.000 1.000 1.46 .88 YJ12 09998 YJ12-1 46205 14 2.333 1.000 1.79 .88 YJ14 10000 YJ14-1 46206 1.125 A – – YJ14-1-1/8 46207 1.000 YJ15 10002 YJ15-1 46208 15 2.500 1.125 1.96 .88 – – YJ15-1-1/8 46209 1.1875 – – YJ15-1-3/16 46210 1.250 – – YJ15-1-1/4 46211 †All gears have standard keyway at 90° to setscrew. See Page 323.

FACE

PITCH DIA.

HUB PROJ.

HUB DIA.

BORE

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

8 D.P. 8 D.P.

8 D.P.

6 D.P. 6 D.P.

6 D.P.

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 60, 61 Lubrication — 322 Materials — 323 Selection Procedure — 49

P-1930-BG

9/17

Boston Gear 800-825-6544

45

Spur Gears 6 and 5 Diametral Pitch (Steel & Cast Iron) 20° Pressure Angle (will not operate with 14-1/2° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Style Without Keyway No. Hub or Setscrew See of Pitch Page Catalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code

A

6 DIAMETRAL PITCH

FACE

PITCH DIA.

HUB PROJ.

BORE

HUB DIA.

OVERALL LENGTH

STANDARD TOLERANCES DIMENSION TOLERANCE BORE All ±.0005

6 D.P. 6 D.P.

6 D.P.

5 D.P. 5 D.P. 5 D.P.

REFERENCE PAGES Alterations — 322 Horsepower Ratings — 61, 62 Lubrication — 322 Materials — 323 Selection Procedure — 49

46

Boston Gear 800-825-6544

With Keyway and Setscrew† Catalog Item Number Code

Face = 2.000” Outside Dia. = Pitch Dia. + .333” Overall Length = 2.000” + Hub Proj.

STEEL 1.000 YJ16 10004 YJ16-1 46212 1.125 2.13 .88 – – YJ16-1-1/8 46213 16 2.667 1.1875 – – YJ16-1-3/16 46214 1.250 – – YJ16-1-1/4 46215 1.000 YJ18 10006 YJ18-1 46216 YJ18-1-1/8 46217 18 3.000 1.125 2.46 .88 – – 1.1875 – – YJ18-1-3/16 46218 1.250 – – YJ18-1-1/4 46219 1.000 A YJ21 10008 YJ21-1 46220 YJ21-1-1/8 46221 21 3.500 1.125 2.96 .88 – – 1.1875 – – YJ21-1-3/16 46222 1.250 – – YJ21-1-1/4 46223 24 4.000 3.00 YJ24A 10704 – – 27 4.500 1.125 3.50 .88 YJ27A 10706 – – 30 5.000 4.00 YJ30C 10708 – – CAST IRON 33 5.500 1.125 3.00 YJ33B 10710 – – 1.50 B 36 6.000 3.50 A YJ36B 10712 – – 42 7.000 YJ42B 10714 – – 48 8.000 1.250 3.50 1.50 B YJ48B 10716 – – 54 9.000 YJ54B 10718 – – 60 10.000 YJ60B 10720 – – C YJ66B 66 11.000 10722 – – 72 12.000 YJ72B 10724 – – 1.250 4.00 1.50 84 14.000 YJ84B 10726 – – 96 16.000 D YJ96B 10728 – – 108 18.000 YJ108B 10730 – – 120 20.000 1.375 4.50 1.50 YJ120B 10732 – – Face = 2.500” 5 Outside Dia. = Pitch Dia. + .400” DIAMETRAL PITCH Overall Length = 2.500” + Hub Proj. STEEL 1.78 YK12 10010 2.18 YK14 10012 2.38 .88 YK15 10014 A YK16 2.58 10016 2.98 YK18 10018 3.38 YK20 10020 CAST IRON 24 4.800 YK24 10738 25 5.000 1.125 3.75 1.25 A YK25B 10740 28 5.600 YK28 10742 30 6.000 YK30B 10744 35 7.000 10746 B YK35B 40 8.000 1.250 3.75 YK40B 10748 1.25 45 9.000 YK45B 10750 50 10.000 4.00 C YK50B 10752 60 12.000 YK60B 10754 70 14.000 1.375 4.38 1.50 YK70B 10756 80 16.000 YK80B 10758 100 20.000 YK100B 10762 110 22.000 1.500 4.75 1.75 D YK110B 10764 120 24.000 5.00 YK120B 10766 140 28.000 5.00 YK140B 10768 160 32.000 1.625 5.00 2.00 YK160B 10770 180 36.000 5.50 YK180B 10772 – †All gears have standard keyway at 90° to setscrew. See Page 323. 12 14 15 16 18 20

2.400 2.800 3.000 1.125 3.200 3.600 4.000

– – – – – –

– – – – – –

– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

P-1930-BG

9/17

Rack 20 through 4 Diametral Pitch (Steel) 20° Pressure Angle (will not operate with 14-1/2° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

Pitch Line Nominal Mating Steel Overall to Back Length Spur Gear Catalog Item Thickness (B) (Feet) Page No. Number Code 20 DIAMETRAL PITCH

FACE WIDTH - .500”

.500 .450 4 42 6

L2020-4 12758 L2020-6 12760

DIAMETRAL PITCH FACE WIDTH - .750” 4 .750 .688 43 6

L2016-4 12762 L2016-6 12764

16

12 DIAMETRAL PITCH

FACE WIDTH - 1.000”

1.000 .917 4 43 – 44 L2012-4 37320 6 L2012-6 37322 10 DIAMETRAL PITCH

FACE WIDTH - 2.000”

FACE WIDTH - 2.500”

1.500 1.300 4 46 6 4 DIAMETRAL PITCH

OVERALL THICKNESS

LENGTH

L208-4 37312 L208-6 37314

1.500 1.333 4 45 – 46 L206-4 37308 6 L206-6 37310 5 DIAMETRAL PITCH

WIDTH

L2010-4 37316 L2010-6 37318

FACE WIDTH - 1.500”

1.500 1.375 4 45 6 6 DIAMETRAL PITCH

PITCH LINE TO BACK (B)

FACE WIDTH - 1.250”

1.250 1.150 4 44 6 8 DIAMETRAL PITCH

A

L205-4 37304 L205-6 37306

FACE WIDTH - 3.500”

2.000 1.750 4 – 6

L204-4 37300 L204-6 37302

STANDARD TOLERANCES DIMENSION LENGTH† All 1/2 – 3/4 FACE 1 – 1-1/2 WIDTH 2 – 2-1/2 3-1/2

TOLERANCE +1.000 – .000 +.000 – .002 +.000 – .003 +.000 – .004 +.000 – .006

†Ends not machined. Tolerance allows for cutting and matching.

PITCH DIA OF GEAR (D)

GEAR CENTER LINE TO BACK OF RA B+D 2

FACE WIDTH CK

OVERALL THICKNESS

LENGTH PITCH LINE TO BACK (B)

REFERENCE PAGES Alterations — 322 Lubrication — 322 Materials — 323

P-1930-BG

9/17

Boston Gear 800-825-6544

47

Internal Gears 64 through 24 Diametral Pitch (Brass) 20° Pressure Angle (will not operate with 14-1/2° spurs) ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE

No. of Teeth

A

Pitch Dia. O.D. I.D.

64 DIAMETRAL PITCH 64 1.000 96 1.500 128 2.000 192 3.000 48 DIAMETRAL PITCH 48 1.000 72 1.500 96 2.000 144 3.000 192 4.000 FACE

PITCH DIA.

INSIDE DIA.

OUTSIDE DIA.

32 DIAMETRAL PITCH 48 1.500 64 2.000 96 3.000 128 4.000 192 6.000 24 DIAMETRAL PITCH 36 1.500 48 2.000 72 3.000 96 4.000 144 6.000

Catalog Number

Item Code

1.500 2.000 2.750 3.750

.980 1.480 1.980 2.980

FACE WIDTH - .125” YI6464 12030 YI6496 12032 YI64128 12034 YI64192 12036

1.500 2.000 2.750 3.750 4.750

.974 1.474 1.974 2.974 3.974

FACE WIDTH - .125” YI4848 12020 YI4872 12022 YI4896 12024 YI48144 12026 YI48192 12028

2.000 2.750 3.750 4.750 6.750

1.461 1.961 2.961 3.961 5.961

FACE WIDTH - .188” YI3248 12010 YI3264 12012 YI3296 12014 YI32128 12016 YI32192 12018

2.250 2.750 3.750 4.750 6.750

1.450 1.950 2.950 3.950 5.950

FACE WIDTH - .250” YI2436 12000 YI2448 12002 YI2472 12004 YI2496 12006 YI24144 12008

NOTE: The difference in tooth numbers between Gear and Pinion should not be less than 12.

STANDARD TOLERANCES DIMENSION 64 Pitch All 48 Pitch All I.D. 32 Pitch All 24 Pitch All O.D. All

TOLERANCE +.004 – .000 +.005 – .000 +.006 – .000 +.008 – .000 +.001 + .003

PINION PITCH DIA. (d) CENTER DISTANCE

GEAR PITCH DIA. (D)

CENTER = D – d DISTANCE 2

48

Boston Gear 800-825-6544

P-1930-BG

9/17

Spur Gears Boston spur gears are designed to transmit motion or power between ­parallel shafts. Configurations include spur, rack, pinion wire, stem pinions and internal gears; most with a selection of bores, keyways and setscrews. Styles include plain, web, web with lightening holes or spoked. Change gears have consecutive numbers of teeth for reduction uses.

A

Boston fine-pitch spur gears are available in Delrin and Brass. Configurations include spur, rack, pinion wire and internal gears; most with a selection of bores, keyways, and setscrews. Styles include plain, web with lightening holes or spoked.

Selection Procedure

Selection Hints

1. Determine service factor. a. Using application Classification Chart, pages 331332, determine service factor or b. With knowledge of operating conditions and load classification, select service factor from Table 1 below.

A. Select pinion having pitch diameter at least twice the shaft diameter.

Design HP = Application Load X Service Factor (Table 1)

C. For tooth numbers or RPMs not on Chart, interpolation of horsepower is adequate.

B. Pinion number of teeth should be greater than 16 for 141⁄2°PA and 13 for 20°PA to avoid excessive under­ cutting.

3. Select spur gear pinion with horsepower capacity equal to (or greater than) design horsepower determined in Step 2. 141⁄2° Pressure Angle Spur Gears—Page 50 to Page 57. 20° Pressure Angle Spur Gears— Page 58 to Page 62. 4. Select a driven spur gear with a catalog rating equal to or greater than the horsepower determined in Step 2. All ­ratings are predicated on gears properly lubricated and maintained.

D. Pitchline velocities above 1000 FPM are not ­recommended for metallic spur gears. The Selection Chart reflects this in the lack of ratings for larger ­numbers of teeth at higher RPM’s. Ratings to the right of heavy line are not recommended, as suggested ­maximum velocity is exceeded, and should be used for interpolation purposes only.

TABLE 1 Service Factor .8 1.0 1.25 1.50 1.75 2.0

Operating Conditions

Uniform — not more than 15 minutes in 2 hours. Moderate Shock — not more than 15 minutes in 2 hours. Uniform — not more than 10 hours per day. Moderate Shock — not more than 10 hours per day. Uniform — more than 10 hours per day. Heavy Shock — not more than 15 minutes in 2 hours. Moderate Shock — more than 10 hours per day. Heavy Shock — not more than 10 hours per day. Heavy Shock — more than 10 hours per day.

Heavy shock loads and/or severe wear conditions may require the use of higher service factors. Consultation with factory is recommended in these applications.

P-1930-BG

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Boston Gear 800-825-6544

49

Spur Gears Approximate Horsepower and Torque* Ratings For Class I Service (Service Factor = 1.0) 32 DIAMETRAL PITCH STEEL

A

25 RPM

50 RPM

141⁄2° PRESSURE ANGLE

100 RPM

1200 RPM

1800 RPM

3600 RPM

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

16 18 20 22 24 26 28 30 32 40 48 56 64 80 96 128 160 192

.003 7.4 .003 8.9 .004 10.2 .005 11.7 .01 13.0 .01 14.5 .01 15.9 .01 17.3 .01 18.9 .01 24.5 .01 29.9 .01 35.7 .02 41.4 .02 52.4 .02 62.6 .03 83.9 .04 106 .05 126

.01 .01 .01 .01 .01 .01 .01 .01 .01 .02 .02 .03 .03 .04 .05 .06 .08 .09

7.3 8.8 10.2 11.6 12.9 14.4 15.1 17.0 18.7 24.2 29.4 35 40.6 51 60.6 80.6 101 119

.01 .01 .02 .02 .02 .02 .02 .03 .03 .04 .05 .05 .06 .08 .09 .12 .15 .17

7.1 8.5 9.8 11.1 12.3 13.7 14.9 16.1 17.6 22.4 26.8 31.5 36 44.2 51.2 64.9 78.2 88.4

.03 .04 .05 .05 .06 .06 .07 .07 .08 .10 .12 .14 .16 .19 .22 .27 .32 .36

7.0 8.3 9.6 10.8 11.9 13.3 14.5 15.5 16.9 21.3 25.4 29.6 33.5 40.6 46.4 57.5 67.8 75.4

.06 .07 .08 .09 .10 .12 .12 .13 .14 .18 .21 .24 .26 .31 .34 .41 .46 .50

6.6 7.8 8.9 9.9 10.9 12.0 13.1 13.9 15.2 18.7 21.8 24.9 27.8 32.5 36.2 42.7 48.6 52.4

.09 .10 .12 .13 .14 .16 .17 .18 .20 .24 .27 .31 .34 .39 .42 .49 .54 .57

6.3 7.3 8.3 9.3 10.1 11.1 12.0 12.7 13.7 16.7 19.1 21.6 23.7 27.2 29.6 34 37.9 40.1

.11 .13 .15 .16 .18 .20 .21 .22 .24 .29 .32 .36 .39 .44 .48 .54

5.9 6.9 7.8 8.7 9.4 10.2 11.0 11.7 12.6 15 17 18.9 20.7 23.3 25.1 28.3

.15 .18 .20 .22 .24 .26 .27 .29 .31 .36 .40 .44 .47 .52 .55

5.4 6.1 6.9 7.6 8.3 8.9 9.5 10.0 10.7 12.5 13.9 15.3 16.5 18.2 19.2

.24 .27 .30 .32 .34 .37 .39 .40 .43 .48 .52 .55 .58

4.2 4.7 5.2 5.7 6.0 6.4 6.8 7.0 7.4 8.4 9.0 9.7 10.2

24 DIAMETRAL PITCH STEEL 25 RPM

50 RPM

.02 .03 .03 .04 .04 .04 .05 .05 .06 .07 .09 .10 .11 .14 .16 .21 .25 .28

300 RPM

600 RPM

141⁄ 2° PRESSURE ANGLE

100 RPM

200 RPM

No. Teeth

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

12 14 15 16 18 20 21 24 30 36 42 48 60 72 96 120 144

.004 .01 .01 .01 .01 .01 .01 .01 .02 .02 .02 .03 .04 .04 .06 .07 .09

10.9 14.2 15.8 17.5 20.9 24.3 26.1 30.7 40.7 51.2 60.7 70.4 90 109 147 185 219

.01 .01 .01 .01 .02 .02 .02 .02 .03 .04 .05 .05 .07 .08 .11 .14 .16

10.8 14.1 15.7 17.4 20.7 24.1 25.8 30.4 40.2 50.4 59.6 68.9 87.7 106 141 175 207

.02 .02 .02 .03 .03 .04 .04 .05 .06 .08 .09 .11 .13 .16 .21 .25 .29

10.7 13.9 15.5 17.2 20.4 23.7 25.4 29.7 39.2 48.8 59.5 66.2 83.3 99.8 130 159 185

Torque

.03 10.5 .04 13.6 .05 15.1 .05 16.7 .06 19.8 .07 22.9 .08 24.5 .09 28.5 .12 37.2 .15 46 .17 53.6 .19 61.3 .24 75.9 .28 89.5 .36 113 .43 135 .49 153

300 RPM H.P.

Torque

.05 10.3 .06 13.3 .07 14.7 .08 16.2 .09 19.2 .11 22.1 .11 23.6 .13 27.5 .17 35.5 .21 43.5 .24 50.3 .27 57 .33 69.6 .39 81 .48 100 .56 118 .62 131

900 RPM

REFERENCE PAGE 19.

No. Teeth

7.3 8.7 10.1 11.4 12.7 14.1 15.5 16.7 18.3 23.6 28.5 33.8 38.9 48.5 57.1 74.6 92.1 107

200 RPM

3/16” FACE

1/4” FACE

600 RPM

900 RPM

REFERENCE PAGE 20.

1200 RPM

1800 RPM

3600 RPM

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

.09 .12 .13 .14 .17 .19 .20 .23 .30 .36 .40 .45 .53 .60 .71 .80 .86

9.7 12.4 13.7 15 17.6 20.1 21.4 24.6 31.1 37.3 42.4 47.2 55.9 63.2 74.7 84.3 90.8

.13 .17 .18 .20 .23 .26 .28 .32 .40 .47 .52 .58 .67 .74 .85 .94 .99

9.2 11.6 12.8 14 16.3 18.5 19.6 22.3 27.7 32.7 36.6 40.3 46.6 51.8 59.5 65.7 69.6

.17 .21 .23 .25 .29 .33 .34 .39 .48 .55 .61 .67 .76 .84 .94 1.07

8.7 10.9 12 13.1 15.1 17.1 18.1 20.4 24.9 29.1 32.3 35.1 40 43.9 49.5 56.4

.22 .28 .31 .33 .38 .42 .45 .50 .60 .68 .74 .80 .89 .96

7.9 9.8 10.7 11.6 13.3 14.8 15.6 17.4 20.8 23.9 26 28 31.2 33.6

.35 .43 .46 .49 .55 .61 .63 .69 .80 .89 .94 .99

6.1 7.5 8.0 8.6 9.7 10.6 11.0 12.0 13.9 15.5 16.5 17.4

Ratings are based on strength calculation. Basic static strength rating, or for hand operation of above gears is approximately 3 times the 100 RPM rating. NOTE: Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute. They should be used for interpolation purposes only. * Torque Ratings (Lb. Ins.). Ratings for brass gears are approximately 50% of steel ratings with same face width.

50

Boston Gear 800-825-6544

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9/17

Spur Gears Approximate Horsepower and Torque* Ratings For Class I Service (Service Factor = 1.0) 20 DIAMETRAL PITCH STEEL 25 RPM

50 RPM

141⁄2° PRESSURE ANGLE

100 RPM

1200 RPM

1800 RPM

3600 RPM

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

11 12 13 14 15 16 18 20 22 24 25 28 30 32 35 36 40 48 50 60 64

.01 .01 .01 .01 .01 .02 .02 .02 .02 .03 .03 .03 .03 .04 .04 .04 .05 .06 .06 .08 .08

21.6 23.5 26.9 30.7 34.2 37.8 45.1 52.4 59.5 66.3 70.5 81.2 87.8 96.3 107 110 124 151 158 193 209

.02 .02 .02 .02 .03 .03 .04 .04 .05 .05 .06 .06 .07 .08 .08 .09 .10 .12 .12 .15 .16

21.4 23.4 26.8 30.5 33.9 37.5 44.7 51.9 58.8 65.4 69.5 80 86.4 94.7 105 108 122 148 154 187 203

.03 .04 .04 .05 .05 .06 .07 .08 .09 .10 .11 .12 .13 .15 .16 .17 .19 .22 .23 .28 .30

20.7 22.5 25.7 29.1 32.3 35.7 42.3 48.7 54.9 60.8 64.4 73.4 78.9 86 94.7 97.1 108 128 133 158 169

.10 .10 .12 .13 .15 .16 .19 .22 .25 .28 .29 .33 .36 .39 .42 .43 .48 .56 .58 .68 .73

20.2 21.9 25 28.3 31.4 34.5 40.8 46.9 52.7 58 61.4 69.7 74.6 81 88.9 91 101 118 122 143 153

.18 18.9 .19 20.5 .22 23.2 .25 26.1 .27 28.8 .30 31.6 .35 36.9 .40 42 .45 46.8 .49 51.1 .51 53.8 .57 60.3 .61 64 .66 69.1 .71 74.9 .73 76.4 .79 83.5 .91 95.4 .93 98 1.06 112 1.12 118

.25 .27 .31 .35 .38 .41 .48 .54 .60 .65 .68 .76 .80 .86 .92 .94 1.02 1.14 1.17 1.31 1.37

17.8 19.2 21.6 24.2 26.6 29 33.7 38 42 45.6 47.9 53.2 56.1 60.2 64.7 65.8 71.2 80 81.7 91.6 96

.32 .34 .39 .43 .47 .51 .59 .66 .73 .78 .82 .91 .95 1.02 1.09 1.10 1.18 1.31 1.34 1.48 1.54

16.8 18 20.3 22.6 24.7 26.9 31 34.8 38.2 41.2 43.1 47.5 50 53.3 57 57.8 62.1 69.8 70.1 77.6 80.9

.43 .46 .51 .57 .62 .67 .76 .85 .92 .99 1.03 1.12 1.17 1.24 1.31 1.33 1.41 1.54 1.56 1.70

15.1 16.1 17.9 20 21.7 23.4 26.7 29.7 32.3 34.6 36 39.2 40.9 43.4 46 46.5 49.4 53.8 54.6 59.5

 .66  .70  .77  .84  .90  .97 1.08 1.18 1.26 1.33 1.38 1.47 1.52 1.59 1.66 1.68 1.75

11.6 12.2 13.4 14.7 15.8 16.9 18.9 20.6 22.1 23.3 24.0 25.7 26.6 27.8 29.1 29.3 30.7

.07 .07 .08 .09 .10 .11 .13 .15 .17 .19 .20 .23 .25 .27 .30 .31 .34 .41 .42 .50 .54

20 DIAMETRAL PITCH CAST IRON 25 RPM

50 RPM

No. Teeth

H.P.

Torque

H.P.

Torque

70 72 80 84 90 96 100 112 120 140 144 160 180 200

.05 .06 .06 .07 .07 .07 .08 .09 .09 .11 .11 .13 .14 .15

137 140 158 166 177 189 196 222 237 273 281 317 353 388

.10 .11 .12 .13 .13 .14 .15 .17 .18 .20 .21 .23 .26 .28

132 136 152 159 169 180 186 210 223 255 262 294 324 354

100 RPM

123 126 141 147 155 164 170 189 200 225 230 256 278 300

600 RPM

141⁄2° PRESSURE ANGLE 200 RPM

H.P. Torque H.P.

.20 .20 .22 .23 .25 .26 .27 .30 .32 .36 .37 .41 .44 .48

300 RPM

.35 .35 .39 .40 .42 .44 .46 .50 .53 .58 .59 .64 .69 .73

300 RPM

600 RPM

900 RPM

REFERENCE PAGE 20.

No. Teeth

21.2 23 26.4 30 33.4 36.8 43.8 50.8 57.5 63.8 67.7 77.7 83.7 91.6 101 104 117 141 146 176 190

200 RPM

3/8” FACE

3/8” FACE 900 RPM

REFERENCE PAGE 21.

1200 RPM

1800 RPM

3600 RPM

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

H.P.

109 111 123 127 133 140 144 158 166 183 186 203 217 230

.46 .47 .52 .53 .56 .58 .59 .65 .67 .73 .74 .80 .85 .89

97.5 99.4 108 112 117 122 125 136 141 153 156 168 178 187

.71 .72 .77 .79 .81 .84 .85 .91 .93 .99 1.00 1.06 1.10 1.13

74.2 75.3 80.7 82.7 85.4 87.9 89.5 95.5 98.1 104 105 111 115 119

.86 .87 .92 .94 .96 .98 1.00 1.05 1.07

60 60.6 64.3 65.5 67.2 68.8 69.7 73.6 75.1

.96 .97 1.02 1.03

50.2 50.7 53.4 54.3

Torque

Torque

Ratings are based on strength calculation. Basic static strength rating, or for hand operation of above gears is approximately 3 times the 100 RPM rating. NOTE: Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute. They should be used for interpolation purposes only. *Torque Ratings (Lb. Ins.).

P-1930-BG

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Boston Gear 800-825-6544

51

A

Spur Gears Approximate Horsepower and Torque* Ratings For Class I Service (Service Factor = 1.0) 16 DIAMETRAL PITCH STEEL

A

25 RPM

50 RPM

141⁄ 2° PRESSURE ANGLE

100 RPM

1200 RPM

1800 RPM

3600 RPM

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

11 12 13 14 15 16 18 20 22 24 26 28 30 32 36 40 48

.02 .02 .02 .03 .03 .03 .04 .04 .05 .05 .06 .07 .07 .08 .09 .10 .12

44.9 48.9 56.1 63.8 71.1 78.7 93.8 109 124 138 154 168 182 200 228 258 314

.04 .04 .04 .05 .06 .06 .07 .09 .10 .11 .12 .13 .14 .16 .18 .20 .24

44.5 48.5 55.6 63.2 70.3 77.8 99.6 107 122 135 151 165 179 196 223 251 304

.07 .08 .09 .10 .11 .12 .14 .17 .19 .21 .23 .25 .27 .30 .34 .38 .45

42.7 46.3 52.9 59.8 66.4 73.1 86.5 99 112 124 137 149 160 174 196 217 257

.20 .21 .24 .28 .30 .33 .39 .45 .51 .56 .61 .66 .71 .77 .86 .95 1.11

41.5 44.9 51.2 57.8 63.9 70.3 82.8 94.9 106 117 129 140 149 162 181 200 232

.36 .39 .44 .50 .55 .60 .70 .79 .88 .96 1.04 1.12 1.19 1.28 1.40 1.52 1.73

38.3 41.2 46.7 52.4 57.6 63 73.4 83.2 92.3 100 110 118 125 134 147 160 181

.51 .54 .61 .68 .75 .82 .94 1.06 1.16 1.26 1.36 1.45 1.53 1.63 1.77 1.91 2.12

35.6 38.1 42.9 47.9 52.5 57.1 65.9 74.1 81.5 88 95.4 102 107 114 124 134 149

.63 .67 .76 .84 .92 .99 1.14 1.27 1.39 1.49 1.61 1.71 1.79 1.90 2.05 2.18 2.40

33.2 35.4 39.7 44.2 48.1 52.2 59.8 66.7 72.9 78.3 84.4 89.6 93.8 99.7 107 115 126

.84 .89 .99 1.09 1.18 1.27 1.44 1.59 1.72 1.83 1.96 2.06 2.15 2.27 2.42 2.55 2.76

29.4 31 34.6 38.2 41.3 44.5 50.4 55.7 60.3 64.2 68.6 72.3 75.1 79.4 84.6 89.4 96.5

1.24 1.29 1.42 1.55 1.66 1.77 1.96 2.13 2.27 2.38 2.51 2.62 2.69 2.81

21.7 22.6 24.9 27.1 29.0 30.9 34.3 37.2 39.7 41.7 43.9 45.8 47.1 49.3

.14 .15 .17 .19 .21 .23 .27 .32 .36 .39 .43 .47 .51 .55 .62 .69 .81

16 DIAMETRAL PITCH CAST IRON 25 RPM

50 RPM

No. Teeth

H.P.

Torque

H.P.

Torque

54 56 60 64 72 80 84 96 112 120 128 144 160 192

.09 .09 .10 .10 .12 .13 .14 .15 .18 .19 .20 .23 .26 .307

217 224 239 260 290 327 342 388 455 486 516 574 648 762

.17 .17 .18 .20 .22 .25 .26 .29 .34 .36 .38 .42 .47 .54

209 216 231 249 277 311 325 365 425 452 477 527 590 683

100 RPM

196 202 214 231 255 283 294 327 376 396 415 453 500 566

200 RPM

.55 .57 .60 .64 .69 .76 .79 .86 .97 1.01 1.05 1.12 1.22 1.34

16 DIAMETRAL PITCH NON-METALLIC No. Teeth

25 RPM H.P.

Torque

50 RPM H.P.

Torque

100 RPM

900 RPM

.06 .09 .11 .14 .18 .21 .26

300 RPM

600 RPM

1/2” FACE 900 RPM

REFERENCE PAGE 22.

1200 RPM

1800 RPM

3600 RPM

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

H.P.

173 178 188 201 219 240 248 271 304 318 330 353 384 421

.74 .76 .80 .85 .91 .99 1.02 1.10 1.22 1.26 1.30 1.38 1.48 1.60

156 160 167 178 192 208 214 231 256 265 274 289 311 335

1.13 1.16 1.20 1.26 1.33 1.42 1.45 1.53 1.65 1.69 1.72 1.79 1.89

119 121 126 132 140 149 152 161 173 177 181 188 198

1.38 1.40 1.44 1.50 1.57 1.66 1.69 1.76

96.6 98.1 100 105 110 116 118 123

1.54 1.57 1.60 1.67

81.1 82.2 84.2 87.5

141⁄ 2° PRESSURE ANGLE 1/2” FACE

200 RPM

H.P. Torque H.P.

16 20 24 32 40 48 64

600 RPM

141⁄ 2° PRESSURE ANGLE

H.P. Torque H.P.

.31 .32 .34 .37 .40 .45 .47 .52 .60 .63 .66 .72 .79 .90

300 RPM

REFERENCE PAGE 21 & 22.

No. Teeth

43.9 47.8 54.7 62 68.9 76.2 90.5 105 118 131 146 160 172 188 213 239 286

200 RPM

1/2” FACE

300 RPM

600 RPM

900 RPM

Torque

Torque

REFERENCE PAGE 22.

1200 RPM

1800 RPM

3600 RPM

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

19 28 34 44 57 63 82

.09 .12 .15 .19 .24 .28 .34

19 30 31 40 50 58 71

.15 .20 .24 .31 .38 .44 .54

16 21 25 32 40 46 57

.20 .26 .31 .40 .49 .60 .72

14 18 22 28 34 40 50

.25 .32 .38 .49 .62 .72 .88

13 17 20 26 32 37 46

.32 .42 .50 .65 .82 .96 1.20

11 15 17 23 29 33 42

.56 .69 .82 1.12 1.41 1.65

Torque

9 12 14 20 25 29

Ratings are based on strength calculation. Basic static strength rating, or for hand operation of above gears is approximately 3 times the 100 RPM rating. NOTE: 1. Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute. They should be used for interpolation purposes only. 2. Non-metallic gears are most commonly used for the driving pinion of a pair of gears, with mating gear made of Cast Iron or Steel, where pitch line velocities exceed 1000 FPM and are not subjected to shock loads. *Torque Ratings (Lb. Ins.).

52

Boston Gear 800-825-6544

P-1930-BG

9/17

Spur Gears Approximate Horsepower and Torque* Ratings For Class I Service (Service Factor = 1.0) 12 DIAMETRAL PITCH STEEL 25 RPM

50 RPM

No. Teeth

H.P.

Torque

H.P.

Torque

11 12 13 14 15 16 18 20 21 22 24 30 32 36 40 42

.05 .05 .06 .07 .07 .08 .10 .11 .12 .13 .14 .19 .21 .24 .27 .28

119 130 149 169 189 209 249 289 310 328 365 483 529 605 682 715

.09 .10 .12 .13 .15 .16 .19 .23 .24 .26 .28 .37 .41 .46 .52 .55

118 129 147 167 186 206 245 284 304 322 357 470 514 586 659 689

141⁄ 2° PRESSURE ANGLE

100 RPM

200 RPM

H.P. Torque H.P.

.18 .20 .23 .26 .29 .32 .38 .44 .47 .49 .54 .71 .77 .88 .98 1.02

116 126 144 163 181 200 237 274 293 310 343 447 488 552 617 644

.35 .38 .44 .49 .55 .60 .71 .82 .87 .92 1.01 1.29 1.40 1.57 1.74 1.80

12 DIAMETRAL PITCH CAST IRON 25 RPM

No. Teeth

H.P.

Torque

48 54 60 64 72 84 96 108 112 120 144 168

.20 .23 .25 .27 .30 .36 .40 .46 .47 .50 .59 .69

497 571 631 683 762 896 1014 1148 1187 1264 1487 1745

50 RPM H.P.

.38 .43 .48 .51 .57 .66 .74 .84 .86 .91 1.06 1.22

Torque

477 545 600 647 718 837 938 1054 1087 1150 1333 1541

100 RPM

441 500 546 586 644 739 817 906 929 975 1103 1248

No. Teeth

H.P.

Torque

15 18 21 24 30 36 48 60

50 RPM H.P.

Torque

100 RPM

1200 RPM

1800 RPM

3600 RPM

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

112 120 138 156 172 190 224 257 274 288 317 407 442 495 547 568

.51 .55 .63 .71 .78 .86 1.01 1.15 1.22 1.28 1.41 1.78 1.92 2.13 2.34 2.42

108 116 132 149 164 180 242 215 257 270 296 373 403 448 492 509

.93 .99 1.12 1.25 1.37 1.50 1.73 1.95 2.06 2.15 2.33 2.85 3.05 3.33 3.59 3.69

97 104 118 131 144 157 182 205 216 226 245 299 320 349 377 387

1.27 1.35 1.51 1.68 1.83 1.99 2.28 2.54 2.67 2.78 2.98 3.57 3.80 4.09 4.37 4.46

88.6 94.4 106 118 128 139 159 178 187 195 209 250 266 286 306 312

1.55 1.64 1.83 2.03 2.20 2.38 2.70 2.99 3.14 3.25 3.47 4.09 4.32 4.62 4.90 4.99

81.5 86.3 96.3 107 116 125 142 157 164 171 182 215 227 243 257 262

2.00 2.10 2.33 2.56 2.76 2.96 3.32 3.64 3.80 3.92 4.14 4.78 5.02 5.31

70 73.6 81.6 89.6 96.6 103 116 127 133 137 145 167 176 186

2.82 2.92 3.19 3.46 3.69 3.91 4.31 4.65 4.81 4.93 5.14

49.4 51.1 55.9 60.6 64.6 68.5 75.4 81.4 84.3 86.2 90.0

200 RPM

1.22 1.36 1.47 1.56 1.69 1.90 2.06 2.24 2.29 2.37 2.61 2.87

12 DIAMETRAL PITCH NON-METALLIC 25 RPM

600 RPM

.13 .19 .23 .27 .34 .40 .51 .60

600 RPM

3/4” FACE 900 RPM

REFERENCE PAGE 23.

1200 RPM

1800 RPM

3600 RPM

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

H.P.

384 430 463 493 533 598 649 706 720 748 821 905

1.62 1.79 1.91 2.02 2.17 2.40 2.56 2.76 2.80 2.89 3.11 3.38

340 377 402 425 455 503 538 579 588 607 654 710

2.41 2.62 2.74 2.87 3.01 3.24 3.39 3.58 3.62 3.69 3.86

253 275 288 301 316 340 356 376 379 387 406

2.88 3.09 3.21 3.33 3.46

201 216 224 233 242

3.19 3.40

167 178

141⁄ 2° PRESSURE ANGLE 3/4” FACE

200 RPM

H.P. Torque H.P.

300 RPM

900 RPM

REFERENCE PAGE 22.

Torque

141⁄ 2° PRESSURE ANGLE

H.P. Torque H.P.

.70 .79 .87 .93 1.02 1.17 1.30 1.44 1.47 1.55 1.75 1.98

300 RPM

3/4” FACE

300 RPM

600 RPM

900 RPM

Torque

Torque

REFERENCE PAGE 23.

1200 RPM

1800 RPM

3600 RPM

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

41 60 72 85 107 126 161 189

.20 .26 .31 .36 .44 .52 .66 .80

42 54 65 76 92 109 138 168

.34 .43 .50 .58 .73 .82 1.05 1.29

36 45 52 60 76 86 110 135

.45 .56 .66 .76 .95 1.13 1.39 1.72

31 39 46 53 66 79 97 120

.56 .68 .81 .92 1.14 1.36 1.70 2.13

29 36 42 48 60 71 89 112

.72 .90 1.06 1.22 1.56 1.83 2.33 2.95

25 31 37 42 54 64 81 103

1.15 1.44 1.80 2.07 2.64 3.18

20 25 31 36 46 56

Ratings are based on strength calculation. Basic static strength rating, or for hand operation of above gears is approximately 3 times the 100 RPM rating. NOTE: 1. Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute. They should be used for interpolation purposes only. 2. Non-metallic gears are most commonly used for the driving pinion of a pair of gears, with mating gear made of Cast Iron or Steel, where pitch line velocities exceed 1000 FPM and are not subjected to shock loads. *Torque Ratings (Lb. Ins.).

P-1930-BG

9/17

Boston Gear 800-825-6544

53

A

Spur Gears Approximate Horsepower and Torque* Ratings For Class I Service (Service Factor = 1.0) 10 DIAMETRAL PITCH STEEL

A

25 RPM

50 RPM

141⁄ 2° PRESSURE ANGLE

100 RPM

200 RPM

No. Teeth

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

11 12 14 15 16 18 20 24 25 28 30 32 35 36

.09 .10 .13 .14 .16 .19 .22 .28 .29 .34 .37 .40 .45 .46

229 249 325 362 400 447 553 698 742 854 922 1010 1123 1153

.18 .20 .25 .28 .31 .37 .43 .54 .57 .66 .71 .78 .86 .88

226 246 320 356 393 468 542 681 722 829 893 977 1083 1111

.35 .38 .49 .55 .60 .72 .83 1.03 1.09 1.24 1.34 1.46 1.60 1.64

221 240 311 345 381 451 520 648 687 784 842 917 1011 1036

.67 .73 .93 1.03 1.13 1.33 1.53 1.88 1.98 2.24 2.39 2.59 2.83 2.89

10 DIAMETRAL PITCH CAST IRON 25 RPM

50 RPM

100 RPM

300 RPM

1” FACE

600 RPM

900 RPM

REFERENCE PAGE 23.

1200 RPM

1800 RPM

3600 RPM

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

211 229 294 325 357 420 481 592 625 707 754 817 893 912

.96 1.04 1.33 1.46 1.60 1.87 2.13 2.59 2.73 3.06 3.25 3.51 3.80 3.88

202 218 279 307 337 394 448 545 574 644 683 737 799 815

1.71 1.83 2.30 2.51 2.73 3.15 3.53 4.19 4.38 4.83 5.07 5.41 5.79 5.87

179 192 241 264 287 330 371 440 460 507 533 569 608 617

2.31 2.45 3.04 3.30 3.57 4.07 4.52 5.26 5.49 5.98 6.24 6.61 7.01 7.09

162 172 213 231 250 285 317 369 384 419 437 463 491 496

2.80 2.95 3.62 3.92 4.22 4.76 5.26 6.04 6.28 6.79 7.05 7.44 7.83 7.91

147 155 190 206 221 250 276 317 330 357 370 391 411 415

3.55 3.71 4.49 4.82 5.15 5.75 6.28 7.09 7.34 7.85 8.10

124 130 157 169 180 201 220 248 257 275 283

4.85 5.00 5.89 6.25 6.62 7.25 7.79

85 88 103 109 116 127 136

141⁄ 2° PRESSURE ANGLE

1200 RPM

1800 RPM

3600 RPM

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

H.P.

40 42 45 48 50 54 55 60 64 70 72 80 84 90 96 100 110 120 140 144 160 180

.31 .32 .35 .38 .39 .43 .44 .48 .51 .56 .57 .64 .67 .72 .76 .79 .87 .94 1.08 1.11 1.24 1.37

780 818 889 946 983 1083 1105 1199 1297 1410 1447 1623 1697 1807 1916 1988 2203 2380 2724 2791 3132 3459

.59 .62 .67 .71 .74 .82 .83 .90 .97 1.04 1.07 1.19 1.24 1.32 1.39 1.44 1.58 1.69 1.91 1.95 2.16 2.36

749 783 850 901 935 1029 1046 1130 1217 1316 1349 1502 1565 1659 1750 1810 1990 2133 2405 2457 2727 2971

1.10 1.15 1.24 1.31 1.35 1.48 1.50 1.61 1.72 1.84 1.88 2.07 2.15 2.26 2.37 2.44 2.64 2.80 3.09 3.15 3.44 3.68

603 626 670 701 722 782 791 839 890 942 958 1039 1069 1111 1152 1177 1258 1314 1413 1430 1535 1609

2.54 2.63 2.79 2.91 2.98 3.21 3.24 3.41 3.59 3.77 3.82 4.10 4.10 4.34 4.46 4.54 4.81 4.98 5.27 5.33 5.66 5.87

534 552 587 611 626 674 681 716 755 792 803 861 882 911 938 955 1011 1047 1108 1119 1188 1233

3.79 3.88 4.08 4.20 4.27 4.53 4.57 4.73 4.93 5.10 5.15 5.43 5.51 5.63 5.73 5.80 6.05 6.18

398 407 428 441 449 476 480 497 518 535 541 570 579 591 602 609 636 650

4.52 4.61 4.81 4.92 4.99 5.26 5.29 5.43

317 323 337 345 350 368 371 381

5.01 5.09

263 267

1.92 1.99 2.13 2.23 2.29 2.48 2.51 2.66 2.82 2.99 3.04 3.30 3.39 3.53 3.65 3.74 3.99 4.17 4.48 4.54 4.87 5.11

10 DIAMETRAL PITCH NON-METALLIC No. Teeth

25 RPM H.P.

Torque

50 RPM H.P.

Torque

100 RPM

15 18 20 25 30

.27 .33 .40 .51 .62

600 RPM

900 RPM

141⁄ 2° PRESSURE ANGLE

200 RPM

H.P. Torque H.P.

300 RPM

REFERENCE PAGE 24.

No. Teeth

693 722 780 823 851 931 945 1013 1084 1162 1187 1308 1355 1425 1492 1535 1667 1766 1949 1983 2166 2318

200 RPM

1” FACE

300 RPM

600 RPM

1” FACE 900 RPM

Torque

Torque

REFERENCE PAGE 23.

1200 RPM

1800 RPM

3600 RPM

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

85 104 126 161 195

.38 .47 .54 .67 .81

80 99 113 140 170

.63 .78 .88 1.09 1.29

66 82 92 114 135

.83 1.02 1.15 1.42 1.69

58 71 80 99 118

1.00 1.24 1.39 1.73 2.07

52 65 73 90 109

1.31 1.63 1.85 2.32 2.80

46 57 65 81 98

2.08 2.60 3.12 4.00 4.89

36 45 55 70 86

Ratings are based on strength calculation. Basic static strength rating, or for hand operation of above gears is approximately 3 times the 100 RPM rating. NOTE: 1. Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute. They should be used for interpolation purposes only. 2. Non-metallic gears are most commonly used for the driving pinion of a pair of gears, with mating gear made of Cast Iron or Steel, where pitch line velocities exceed 1000 FPM and are not subjected to shock loads. *Torque Ratings (Lb. Ins.).

54

Boston Gear 800-825-6544

P-1930-BG

9/17

Spur Gears Approximate Horsepower and Torque* Ratings For Class I Service (Service Factor = 1.0) 8 DIAMETRAL PITCH STEEL 25 RPM

50 RPM

141⁄ 2° PRESSURE ANGLE

100 RPM

200 RPM

300 RPM

600 RPM

No. Teeth

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

Torque

H.P.

Torque

H.P.

11 12 14 15 16 18 20 22 24 28 30 32

.18 .19 .25 .28 .31 .37 .43 .48 .54 .66 .71 .78

446 485 632 703 778 927 1075 1219 1355 1655 1786 1957

.35 .38 .49 .55 .60 .72 .83 .94 1.04 1.27 1.36 1.49

439 478 620 690 762 905 1047 1184 1313 1596 1718 1878

.68 .73 .95 1.05 1.16 1.37 1.58 1.78 1.96 2.37 2.53 2.76

404 436 559 617 677 794 907 1012 1109 1316 1400 1513

1.82 1.96 2.49 2.74 3.00 3.49 3.96 4.39 4.78 5.61 5.93 6.38

383 412 524 576 630 734 832 923 1004 1178 1247 1340

3.16 3.37 4.21 4.58 4.97 5.69 6.35 6.95 7.46 8.53 8.93 9.49

427 463 599 664 731 865 996 1121 1237 1490 1598 1738

1.28 1.38 1.77 1.96 2.15 2.52 2.88 3.21 3.52 4.18 4.44 4.80

8 DIAMETRAL PITCH CAST IRON 25 RPM

50 RPM

100 RPM

1-1/4” FACE Torque

300 RPM

Torque

600 RPM

900 RPM

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

36 40 42 44 48 54 56 60 64 72 80 84 88 96 112 120 128 144 160

.53 .60 .63 .67 .72 .83 .86 .92 .99 1.10 1.23 1.29 1.34 1.45 1.69 1.79 1.89 2.09 2.33

1339 1508 1579 1681 1824 2092 2164 2307 2492 2775 3107 3246 3384 3656 4256 4517 4773 5272 5868

1.01 1.14 1.19 1.26 1.36 1.55 1.60 1.70 1.83 2.02 2.24 2.34 2.42 2.60 2.98 3.14 3.30 3.59 3.95

1279 1434 1498 1591 1719 1958 2021 2145 2307 2548 2828 2943 3056 3277 3757 3960 4155 4528 4980

1.86 2.07 2.16 2.28 2.44 2.75 2.83 2.98 3.19 3.47 3.81 3.94 4.06 4.31 4.83 5.04 5.24 5.60 6.07

1009 1107 1145 1204 1275 1413 1446 1508 1595 1707 1839 1887 1933 2019 2207 2275 2339 2452 2610

4.21 4.57 4.71 4.93 5.18 5.67 5.78 5.99 6.30 6.66 7.10 7.25 7.39 7.65 8.24 8.44 8.62

884 961 989 1036 1088 1192 1215 1259 1323 1399 1492 1523 1553 1608 1731 1773 1811

6.14 6.55 6.69 6.95 7.19 7.72 7.83 8.01 8.33 8.64 9.06 9.18 9.30 9.50

645 688 703 730 756 811 822 842 875 908 952 965 976 998

7.25 7.66 7.78 8.05 8.27

507 536 545 564 579

3.20 3.51 3.63 3.82 4.05 4.48 4.59 4.79 5.06 5.42 5.84 5.99 6.13 6.41 7.01 7.22 7.42 7.78 8.28

8 DIAMETRAL PITCH NON-METALLIC No. Teeth

25 RPM H.P.

Torque

50 RPM H.P.

Torque

100 RPM

16 18 20 24 28

.56 .61 .74 .90 1.06

6 DIAMETRAL PITCH STEEL 25 RPM

50 RPM

 8.17  8.39  9.81 10.39 10.96

143 147 172 182 192

REFERENCE PAGE 25.

1200 RPM

1800 RPM

3600 RPM

H.P.

H.P.

H.P.

Torque

300 RPM

600 RPM

Torque

REFERENCE PAGE 24.

1200 RPM

1800 RPM

3600 RPM

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

176 192 233 283 334

.76 .88 .99 1.19 1.38

160 185 208 250 290

1.23 1.41 1.59 1.90 2.20

129 148 167 200 231

1.61 1.84 2.08 2.50 2.91

112 129 146 175 204

1.96 2.25 2.54 3.06 3.57

103 118 133 160 187

2.60 3.00 3.40 4.13 4.86

91 105 119 144 170

4.39 4.71 5.84 7.22

77 82 102 126

300 RPM

900 RPM

Torque

Torque

200 RPM

1-1/2” FACE

600 RPM

900 RPM

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

11 12 14 15 16 18 20 21 24 27 30

.38 .41 .53 .59 .65 .78 .90 .97 1.13 1.32 1.49

946 1030 1340 1491 1648 1962 2273 2436 2860 3335 3761

.74 .80 1.04 1.15 1.27 1.51 1.74 1.86 2.18 2.53 2.84

928 1008 1308 1452 1603 1902 2196 2349 2745 3186 3576

1.42 1.54 1.98 2.19 2.41 2.84 3.26 3.48 4.03 4.64 5.17

832 896 1142 1257 1376 1606 1825 1937 2212 2512 2761

3.70 3.97 5.01 5.49 5.98 6.92 7.81 8.25 9.32 10.48 11.41

778 834 1053 1154 1257 1455 1640 1734 1958 2201 2396

6.20 6.57 8.12 8.81 9.51 10.80 11.97 12.56 13.87 15.29 16.35

652 691 853 925 999 1135 1258 1319 1457 1606 1717

8.01 8.41 10.24 11.03 11.83 13.28 14.57 15.20 16.57 18.05 19.10

2.64 2.84 3.62 3.99 4.37 5.10 5.79 6.15 7.02 7.97 8.76

Torque

217 226 271 290 309 343 372 397 417

H.P.

No. Teeth

893 968 1247 1381 1519 1792 2057 2194 2541 2924 3255

H.P.

Torque

141⁄ 2° PRESSURE ANGLE

100 RPM

3600 RPM

Torque

141⁄ 2° PRESSURE ANGLE 1-1/4” FACE

200 RPM

H.P. Torque H.P.

1800 RPM H.P.

Torque

1-1/4” FACE

No. Teeth

1174 1305 1358 1437 1540 1735 1784 1880 2008 2188 2398 2481 2561 2713 3045 3176 3300 3532 3828

1200 RPM H.P.

332 4.19 294 5.00 263 6.21 354 4.43 310 5.26 276 6.47 442 5.45 382 6.40 336 7.75 481 5.90 413 6.89 362 8.29 522 6.36 445 7.39 388 8.83 598 7.20 504 8.30 436 9.80 667 7.96 557 9.10 478 10.64 730 8.62 603 9.79 514 11.34 783 9.17 642 10.36 544 11.90 896 10.33 723 11.54 606 938 10.73 752 11.94 627 997 11.34 794 12.56 660

141⁄ 2° PRESSURE ANGLE 200 RPM

900 RPM H.P.

REFERENCE PAGE 24.

REFERENCE PAGE 25.

1200 RPM

1800 RPM

3600 RPM

Torque

H.P.

H.P.

H.P.

561 589 717 773 828 930 1020 1065 1160 1264 1338

9.37 9.78 11.77 12.62 13.47 15.00 16.33 16.99 18.35

Torque

Torque

492 11.29 395 514 11.69 409 618 13.85 485 663 14.75 517 708 15.65 548 788 17.23 603 858 892 964

Torque

14.19 249 14.51 254

Ratings are based on strength calculation. Basic static strength rating, or for hand operation of above gears is approximately 3 times the 100 RPM rating. NOTE: Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute. They should be used for interpolation purposes only. *Torque Ratings (Lb. Ins.). P-1930-BG

9/17

Boston Gear 800-825-6544

55

A

Spur Gears Approximate Horsepower and Torque* Ratings For Class I Service (Service Factor = 1.0) 6 DIAMETRAL PITCH CAST IRON

A

No. Teeth

32 33 36 40 42 48 54 60 64 66 72 84 96 108 120 144

25 RPM H.P.

50 RPM

100 RPM

Torque

H.P.

Torque

.98 2470 1.01 2543 1.12 2813 1.25 3163 1.31 3310 1.51 3814 1.73 4364 1.90 4801 2.05 5177 2.11 5322 2.28 5750 2.66 6695 2.98 7510 3.35 8436 3.65 9205 4.23 10664

1.86 1.91 2.10 2.35 2.45 2.80 3.18 3.47 3.72 3.81 4.09 4.69 5.19 5.75 6.19 7.01

2341 3.36 2406 3.45 2650 3.77 2962 4.17 3090 4.33 3530 4.88 4005 5.46 4371 5.88 4688 6.26 4807 6.39 5153 6.77 5912 7.60 6538 8.24 7246 8.97 7806 9.50 8831 10.43

200 RPM

H.P. Torque H.P.

2120 2173 2375 2628 2728 3073 3440 3706 3944 4027 4267 4790 5193 5652 5987 6571

5 DIAMETRAL PITCH STEEL 25 RPM

141⁄ 2° PRESSURE ANGLE

50 RPM

5.66 5.78 6.24 6.80 7.02 7.75 8.52 9.02 9.50 9.65 10.08 11.02 11.68 12.45 12.96 13.79

300 RPM H.P.

Torque

H.P.

1783 1821 1967 2144 2211 2441 2683 2842 2993 3040 3175 3473 3680 3924 4083 4347

7.32 7.46 7.99 8.62 8.85 9.64 10.47 10.97 11.48 11.62 12.03 12.96 13.56 14.31

1539 1567 1678 1811 1858 2025 2199 2305 2411 2442 2528 2724 2849 3006

10.38 10.51 11.09 11.76 11.97 12.75 13.59 14.00 14.50 14.62 14.94

100 RPM

200 RPM

300 RPM

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

Torque

11 12 14 15 16 18 20

.63 .68 .89 .99 1.09 1.30 1.50

1583 1723 2241 2491 2754 3275 3793

1.23 1.33 1.73 1.92 2.11 2.50 2.89

1546 1680 2176 2415 2664 3156 3640

2.35 2.54 3.26 3.61 3.97 4.67 5.35

1360 5.99 1258 1462 6.40 1345 1855 8.04 1689 2039 8.79 1847 2227 9.56 2008 2590 11.01 2313 2934 12.36 2597

1479 1600 2057 2275 2501 2942 3370

5 DIAMETRAL PITCH CAST IRON No. Teeth

24 25 30 35 40 45 50 55 60 70 80 100

H.P.

Torque

50 RPM H.P.

1.13 2859 2.16 1.20 3034 2.29 1.49 3752 2.80 1.80 4548 3.37 2.08 5242 3.85 2.36 5947 4.33 2.60 6543 4.73 2.90 7321 5.25 3.14 7910 5.62 3.65 9213 6.45 4.17 10514 7.26 5.03 12671 8.52

Torque

100 RPM

50 RPM

Torque

H.P.

Torque

11 12 14 15 16 18 20 22

1.11 1.21 1.58 1.75 1.93 2.30 2.66 3.01

2810 3057 3971 4414 4876 5794 6703 7579

2.17 2.35 3.04 3.37 3.71 4.39 5.06 5.69

2730 4.10 2963 4.43 3831 5.67 4247 6.26 4680 6.87 5535 8.06 6373 9.21 7173 10.28

Torque

200 RPM

300 RPM

2584 2792 3577 3948 4332 5080 5802 6478

7.41 7.94 10.02 10.98 11.97 13.85 15.61 17.22

1800 RPM

3600 RPM

H.P.

H.P.

Torque

Torque

900 RPM

1800 RPM

3600 RPM H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

1028 1085 1332 1441 1550 1752 1933

12.41 12.99 15.70 16.86 18.03 20.13 21.98

869 910 1099 1181 1262 1410 1539

14.33 14.91 17.82 19.05 20.27 22.46 24.34

753 783 936 1000 1065 1179 1279

16.96 17.49 20.60 21.88

594 613 721 766

600 RPM

Torque

H.P.

2120 2227 2623 3038 3356 3657 3874 4182 4368 4779 5152 5620

8.79 9.20 10.66 12.15 13.25 14.27 14.95 15.99 16.56 17.84 18.99

1847 1933 2238 2554 2783 2997 3142 3359 3478 3748 3989

12.69 13.19 14.80 16.44 17.53 18.52 19.08 20.11 20.55

Torque

REFERENCE PAGE 26.

1200 RPM

9.79 10.33 12.68 13.71 14.76 16.68 18.40

H.P.

300 RPM

1200 RPM H.P.

H.P.

Torque

200 RPM

H.P. Torque H.P.

Torque

1-3/4” FACE

600 RPM

Torque

1-3/4” FACE 900 RPM H.P.

Torque

Torque

REFERENCE PAGE 26.

1200 RPM

1800 RPM

3600 RPM

H.P.

H.P.

H.P.

Torque

Torque

Torque

1333 14.88 1042 1385 15.41 1079 1554 17.00 1191 1727 1841 1945 2005 2112 2159

141⁄ 2° PRESSURE ANGLE

100 RPM

H.P.

H.P.

900 RPM H.P.

REFERENCE PAGE 26.

1090 12.06 844 1104 1165 1235 1257 1339 1427 1471 1523 1536 1569

141⁄ 2° PRESSURE ANGLE

2723 3.95 2487 6.73 2885 4.17 2626 7.07 3534 5.03 3168 8.32 4246 5.95 3749 9.64 4852 6.70 4224 10.65 5459 7.44 4689 11.60 5956 8.01 5051 12.29 6612 8.79 5539 13.27 7089 9.31 5870 13.86 8135 10.46 6592 15.16 9153 11.54 7270 16.35 10745 13.08 8241 17.84

4 DIAMETRAL PITCH STEEL 25 RPM

4.31 4.64 5.89 6.47 7.07 8.22 9.31

H.P. Torque H.P.

No. Teeth

Torque

141⁄ 2° PRESSURE ANGLE

No. Teeth

25 RPM

600 RPM

Torque

1-1/2” FACE

600 RPM

2” FACE 900 RPM

REFERENCE PAGE 27.

1200 RPM

1800 RPM

3600 RPM

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

H.P.

H.P.

2334 2502 3158 3461 3772 4364 4920 5427

10.13 10.79 13.46 14.67 15.90 18.20 20.33 22.23

2128 2266 2827 3081 3339 3824 4271 4670

16.01 16.83 20.48 22.06 23.66 26.56 29.13 31.33

1682 1768 2151 2318 2485 2790 3060 3291

19.86 20.69 24.79 26.52 28.26 31.35 34.04 36.29

1391 1449 1736 1857 1979 2196 2384 2541

22.57 23.37 27.70 29.50 31.30

Torque

Torque

Torque

1185 26.14 915 1228 26.85 940 1455 1550 1644

Ratings are based on strength calculation. Basic static strength rating, or for hand operation of above gears is approximately 3 times the 100 RPM rating. NOTE: Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute. They should be used for interpolation purposes only. *Torque Ratings (Lb. Ins.).

56

Boston Gear 800-825-6544

P-1930-BG

9/17

Spur Gears Approximate Horsepower and Torque* Ratings For Class I Service (Service Factor = 1.0) 4 DIAMETRAL PITCH CAST IRON 25 RPM

50 RPM

No. Teeth

H.P.

Torque

H.P.

Torque

24 28 30 32 36 40 42 44 48 54 56 60 64 72 80 84 88 96

2.00 2.43 2.62 2.86 3.25 3.64 3.80 4.04 4.36 4.97 5.13 5.44 5.86 6.47 7.18 7.47 7.76 8.32

5042 6129 6599 7211 8187 9177 9588 10181 10999 12530 12933 13727 14763 16305 18101 18838 19561 20970

3.77 4.54 4.87 5.30 5.96 6.63 6.90 7.29 7.82 8.81 9.06 9.55 10.20 11.11 12.18 12.60 13.00 13.78

4750 5723 6135 6675 7514 8354 8694 9195 9858 11104 11419 12034 12852 14005 15350 15877 16387 17365

100 RPM

25 RPM

50 RPM

H.P.

Torque

H.P.

Torque

11 12 14 15 16 18 20 21

2.94 3.20 4.15 4.61 5.09 6.03 6.97 7.46

7421 8067 10462 11618 12825 15214 17570 18795

5.67 6.14 7.92 8.76 9.64 11.37 13.05 13.92

7146 7743 9979 11046 12156 14333 16454 17549

200 RPM

H.P. Torque H.P.

6.75 8.02 8.53 9.22 10.24 11.24 11.63 12.22 12.95 14.35 14.68 15.32 16.20 17.33 18.68 19.17 19.63 20.50

4257 5053 5378 5811 6454 7085 7328 7703 8163 9045 9253 9652 10209 10923 11772 12079 12372 12922

3 DIAMETRAL PITCH STEEL No. Teeth

141⁄ 2° PRESSURE ANGLE

100 RPM

50 RPM

No. Teeth

H.P.

Torque

H.P.

Torque

24 30 36 42 48 54 60 72 84 96 108

5.23 6.81 8.41 9.81 11.20 12.71 13.87 16.35 18.76 20.75 22.99

13175 17164 21199 24721 28241 32043 34965 41223 47293 52300 57968

9.67 12.40 15.07 17.32 19.50 21.83 23.52 27.08 30.40 32.96 35.87

12195 15626 18998 21828 24586 27523 29651 34136 38322 41545 45212

6652 7167 9134 10056 11008 12845 14599 15495

100 RPM

18.55 19.80 24.79 27.06 29.38 33.75 37.80 39.84

H.P.

3525 4094 4314 4616 5034 5433 5575 5816 6074 6598 6708 6915 7233 7585 8029 8170 8304 8548

14.32 16.38 17.14 18.22 19.64 20.97 21.42 22.24 23.02 24.72 25.04 25.65 26.66 27.65

3008 3441 3601 3829 4126 4406 4499 4672 4837 5193 5261 5388 5601 5810

19.88 22.16 22.92 24.11 25.49 26.77 27.12 27.97 28.58

Torque

10617 13251 15732 17687 19530 21466 22740 25402 27782 29437 31395

300 RPM

900 RPM H.P.

600 RPM

900 RPM

H.P.

Torque

H.P.

Torque

H.P.

5846 6239 7812 8528 9259 10637 11913 12556

24.82 26.30 32.48 35.24 38.03 43.20 47.89 50.24

5213 5524 6824 7403 7989 9076 10062 10554

37.47 39.14 47.09 50.49 53.89 60.00 65.33 67.96

3936 4111 4947 5304 5661 6303 6863 7139

45.15 46.74 55.40 59.01 62.60 68.93

Torque

26.76 8433 32.25 10162 37.15 11707 40.69 12822 43.91 13838 47.30 14906 49.22 15509 53.32 16803 56.87 17923 59.02 18597 61.84 19486

300 RPM H.P.

Torque

600 RPM H.P.

1200 RPM

1800 RPM

3600 RPM

H.P.

H.P.

H.P.

Torque

3” FACE

Torque

200 RPM

Torque

REFERENCE PAGE 27. Torque

Torque

2089 22.84 1600 2328 2408 2534 2677 2812 2849 2938 3002

141⁄ 2° PRESSURE ANGLE

H.P. Torque H.P.

16.84 21.03 24.96 28.06 30.99 34.06 36.08 40.30 44.08 46.71 49.81

Torque

200 RPM

H.P. Torque H.P.

10.56 11.37 14.49 15.96 17.47 20.38 23.16 24.59

600 RPM

H.P.

141⁄ 2° PRESSURE ANGLE

3 DIAMETRAL PITCH CAST IRON 25 RPM

11.19 12.99 13.69 14.65 15.98 17.24 17.69 18.46 19.28 20.94 21.29 21.94 22.95 24.07 25.48 25.93 26.35 27.13

300 RPM

Torque

2” FACE

Torque

Torque

REFERENCE PAGE 27.

1200 RPM

1800 RPM

3600 RPM

H.P.

H.P.

H.P.

Torque

Torque

3162 50.30 2642 3273 51.78 2719 3880 4132 4383 4827

3” FACE 900 RPM H.P.

Torque

Torque

REFERENCE PAGE 27.

1200 RPM

1800 RPM

3600 RPM

H.P.

H.P.

H.P.

Torque

Torque

Torque

33.30 6995 44.05 4627 22.84 1600 39.23 8241 50.07 5259 44.37 9322 55.08 5786 47.87 10056 51.00 10715 54.35 11417

Ratings are based on strength calculation. Basic static strength rating, or for hand operation of above gears is approximately 3 times the 100 RPM rating. NOTE: Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute. They should be used for interpolation purposes only. *Torque Ratings (Lb. Ins.).

P-1930-BG

9/17

Boston Gear 800-825-6544

57

A

Spur Gears Approximate Horsepower and Torque* Ratings For Class I Service (Service Factor = 1.0) 20 DIAMETRAL PITCH STEEL

A

25 RPM

50 RPM

No. Teeth

H.P.

Torque

H.P.

Torque

12 14 15 16 18 20 24 25 30 35 40 45 50 60 70

.01 .02 .02 .02 .03 .03 .04 .04 .05 .07 .08 .09 .10 .12 .14

36.5 48.0 53.8 58.6 68.6 79.2 99.5 105 132 165 194 224 248 306 365

.03 .04 .04 .05 .05 .06 .08 .08 .10 .13 .15 .17 .19 .24 .28

36.3 47.7 53.3 58.1 67.9 78.4 98.3 103 130 162 190 219 242 296 352

20° PRESSURE ANGLE

100 RPM

1200 RPM

1800 RPM

3600 RPM

Torque

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

.06 .07 .08 .09 .11 .12 .15 .16 .20 .25 .29 .33 .37 .44 .52

34.9 .16 34.1 45.6 .21 44.3 50.9 .23 49.3 55.2 .25 53.5 64.2 .29 62.0 73.7 .34 70.8 91.3 .41 87.1 95.6 .43 91.1 119 .53 112 145 .65 136 168 .75 157 192 .84 177 210 .92 192 250 1.08 227 291 1.24 260

.30 .39 .43 .46 .53 .60 .73 .76 .92 1.09 1.24 1.38 1.47 1.68 1.88

31.8 40.9 45.3 48.8 56.1 63.5 76.7 79.9 96.4 115 130 145 154 177 198

.42 .54 .60 .64 .73 .82 .98 1.02 1.21 1.42 1.58 1.74 1.84 2.07 2.28

29.7 37.9 41.9 44.9 51.2 57.5 68.5 71.1 84.5 99.4 111 122 129 145 160

.53 .67 .74 .79 .90 1.00 1.18 1.22 1.43 1.67 1.84 2.01 2.10 2.34 2.55

28.0 35.4 38.9 41.6 47.1 52.6 61.9 64.1 75.2 87.5 96.6 105 111 123 134

.71 .89 .97 1.04 1.16 1.28 1.48 1.53 1.76 2.02 2.20 2.37 2.46 2.69

25.0 31.2 34.1 36.3 40.6 44.9 51.9 53.5 61.6 70.6 77.0 83.0 86.1 94.0

1.08 1.32 1.42 1.49 1.64 1.78 2.00 2.04 2.28 2.55 2.73

18.9 23.0 24.9 26.2 28.7 31.2 34.9 35.8 40.0 44.7 47.8

20 DIAMETRAL PITCH CAST IRON 25 RPM

50 RPM

No. Teeth

H.P.

Torque

H.P.

Torque

80 84 90 100 120 140 160 180 200

.10 .11 .11 .13 .15 .18 .21 .23 .25

256 269 287 317 387 447 520 579 637

.20 .20 .22 .24 .29 .33 .38 .42 .46

246 257 274 302 365 418 481 532 580

100 RPM

.36 .38 .40 .44 .52 .59 .66 .72 .78

228 237 252 275 327 369 419 457 492

50 RPM

No. Teeth

H.P.

Torque

H.P.

Torque

12 14 15 16 18 20 24 28 30 32 36 40 48 56 60 64 72 80

.03 .04 .05 .05 .06 .07 .09 .11 .12 .13 .16 .18 .22 .26 .28 .31 .35 .39

85.5 112 126 136 160 185 233 283 308 340 395 452 556 665 711 779 872 991

.07 .09 .10 .11 .13 .14 .18 .22 .24 .26 .31 .35 .43 .51 .54 .59 .66 .75

84.7 111 124 135 158 183 229 278 302 333 385 440 539 642 684 748 833 943

600 RPM

200 RPM

.63 .65 .69 .74 .86 .95 1.06 1.13 1.20

300 RPM

900 RPM

1/2” FACE

600 RPM

1200 RPM

1800 RPM

3600 RPM

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

H.P.

198 206 216 233 271 299 333 356 377

.84 .86 .90 .96 1.10 1.20 1.31 1.39 1.46

176 181 189 202 231 251 276 292 306

1.24 1.27 1.32 1.38 1.53 1.62 1.74 1.80 1.86

131 134 138 145 161 170 183 189 195

1.49 1.51 1.55 1.61 1.76 1.83

104 106 109 113 123 128

1.65 1.67 1.71 1.76

86.5 87.8 89.7 92.4

200 RPM

H.P. Torque H.P.

83.4 109 122 133 155 178 222 268 291 320 368 418 508 599 636 692 764 858

.26 .33 .37 .40 .47 .54 .66 .79 .86 .94 1.07 1.21 1.44 1.68 1.77 1.91 2.08 2.31

300 RPM

900 RPM

REFERENCE PAGE 42.

Torque

20° PRESSURE ANGLE

100 RPM

.13 .17 .19 .21 .25 .28 .35 .43 .46 .51 .58 .66 .81 .95 1.01 1.10 1.21 1.36

H.P.

20° PRESSURE ANGLE

H.P. Torque H.P.

16 DIAMETRAL PITCH STEEL 25 RPM

.11 .14 .16 .18 .20 .23 .29 .30 .38 .46 .53 .61 .66 .79 .92

300 RPM

REFERENCE PAGE 42.

H.P. Torque H.P.

35.8 46.9 52.5 57.1 66.7 76.8 95.8 101 126 156 182 209 230 279 329

200 RPM

1/2” FACE

3/4” FACE

600 RPM

900 RPM

Torque

Torque

REFERENCE PAGE 43.

1200 RPM

1800 RPM

3600 RPM

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

80.9 105 117 127 148 169 209 250 270 296 338 381 455 529 557 602 656 728

.37 .48 .54 .58 .67 .77 .94 1.12 1.20 1.31 1.49 1.66 1.96 2.25 2.36 2.54 2.74 3.01

78.4 102 113 122 142 161 198 235 253 275 312 349 412 474 496 533 575 632

.69 .88 .97 1.04 1.19 1.35 1.62 1.88 2.01 2.17 2.42 2.67 3.06 3.43 3.55 3.78 4.00 4.31

72.0 92.2 102 110 125 141 170 198 211 228 254 280 322 360 373 397 420 653

.95 1.20 1.33 1.42 1.61 1.80 2.12 2.44 2.59 2.78 3.06 3.34 3.76 4.15 4.27 4.51 4.72 5.04

66.5 84.4 92.8 99.4 113 126 149 171 181 195 215 234 264 291 299 316 330 353

1.18 1.48 1.62 1.73 1.94 2.16 2.52 2.87 3.02 3.23 3.53 3.82 4.25 4.64 4.75 5.00

61.8 77.7 85.2 90.8 102 113 132 151 159 170 186 201 223 244 250 263

1.55 1.92 2.09 2.21 2.46 2.70 3.10 3.47 3.63 3.86 4.17 4.47 4.88

54.2 67.2 73.1 77.5 86.2 94.7 108 122 127 135 146 156 171

2.26 2.73 2.93 3.07 3.35 3.62 4.02 4.40 4.55 4.79 5.09 5.37

39.5 47.7 51.3 53.8 58.6 63.3 70.4 77.0 79.7 83.9 89.1 94.1

Ratings are based on strength calculation. Basic static strength rating, or for hand operation of above gears is approximately 3 times the 100 RPM rating. NOTE: Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute. They should be used for interpolation purposes only. *Torque Ratings (Lb. Ins.).

58

Boston Gear 800-825-6544

P-1930-BG

9/17

Spur Gears Approximate Horsepower and Torque* Ratings For Class I Service (Service Factor = 1.0) 16 DIAMETRAL PITCH CAST IRON 25 RPM

50 RPM

No. Teeth

H.P.

Torque

H.P.

96 128 144 160 192

.28 .38 .42 .47 .56

707 949 1057 1195 1406

.53 666 .70 879 .77 970 .86 1088 1.00 1260

Torque

100 RPM

50 RPM

No. Teeth

H.P.

Torque

12 13 14 15 16 18 20 21 24 28 30 36 42 48 54

.08 .09 .11 .12 .13 .15 .17 .19 .22 .26 .29 .37 .44 .52 .60

202 .16 200 233 .18 230 265 .21 262 297 .23 293 323 .25 319 379 .30 373 437 .34 429 468 .36 459 548 .43 537 667 .52 651 720 .56 707 928 .71 899 1112 .85 1073 1304 .99 1252 1505 1.14 1437

H.P.

Torque

.95 597 1.21 765 1.32 833 1.46 923 1.66 1044

50 RPM

1.57 1.93 2.06 2.25 2.46

300 RPM

3/4” FACE

600 RPM

H.P.

Torque

H.P.

Torque

H.P.

Torque

494 608 650 707 777

2.01 2.40 2.54 2.73 2.94

421 504 533 574 618

2.79 3.17 3.29 3.49 3.65

293 333 346 366 384

3.20 3.56

224 249

200 RPM

H.P. Torque H.P.

.31 196 .36 225 .41 256 .45 285 .49 310 .57 361 .66 415 .70 443 .82 515 .99 621 1.07 673 1.34 847 1.59 1001 1.84 1159 2.09 1319

100 RPM

Torque

.60 188 .68 215 .77 244 .86 271 .93 294 1.08 340 1.23 389 1.31 413 1.51 477 1.80 568 1.94 612 2.41 759 2.81 884 3.20 1009 3.60 1133

300 RPM

1800 RPM

3600 RPM

H.P.

H.P.

Torque

Torque

REFERENCE PAGE 43. 1800 RPM

3600 RPM

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

.86 .98 1.11 1.23 1.33 1.53 1.74 1.84 2.11 2.49 2.68 3.27 3.77 4.25 4.73

181 206 233 259 279 322 365 388 444 524 562 688 792 893 993

1.54 1.75 1.96 2.16 2.31 2.63 2.95 3.11 3.50 4.04 4.29 5.11 5.73 6.33 6.90

162 183 206 227 243 276 310 327 368 425 451 537 602 665 724

2.09 2.36 2.63 2.88 3.07 3.46 3.84 4.03 4.48 5.10 5.37 6.28 6.94 7.56 8.14

147 165 184 202 215 242 269 282 314 357 376 440 486 529 570

2.55 2.86 3.18 3.46 3.68 4.10 4.52 4.73 5.21 5.86 6.15 7.09 7.76 8.37

134 150 167 182 193 215 238 249 274 308 323 373 407 440

3.27 3.63 4.00 4.34 4.58 5.04 5.50 5.73 6.22 6.89 7.19 8.15

114 127 140 152 160 177 193 201 218 241 252 285

4.53 4.97 5.42 5.80 6.05 6.55 7.02 7.26 7.72

79.4 87.1 94.8 102 106 115 123 127 135

300 RPM

H.P.

Torque

H.P. Torque H.P.

Torque

H.P.

Torque

60 66 72 84 96 108 120 132 144 168 192 216

.40 .45 .48 .58 .65 .75 .82 .89 .97 1.13 1.27 1.41

998 1125 1221 1450 1641 1879 2068 2252 2433 2861 3209 3545

.75 .84 .91 1.07 1.21 1.37 1.49 1.61 1.73 2.00 2.22 2.42

949 1064 1150 1354 1519 1725 1882 2034 2181 2526 2794 3045

1.37 1.53 1.64 1.90 2.10 2.35 2.53 2.70 2.87 3.25 3.52 3.77

733 805 853 969 1050 1156 1224 1287 1344 1484 1573 1649

3.03 3.30 3.47 3.88 4.15 4.51 4.73 4.92 5.09 5.54 5.80 6.01

636 4.34 693 4.65 728 4.81 814 5.24 871 5.49 947 5.85 993 6.03 1033 6.19 1070 6.32 1164 1218 1263

H.P.

1200 RPM

1” FACE

600 RPM

Torque

900 RPM

Torque

Torque

H.P.

2.32 2.56 2.71 3.07 3.33 3.67 3.88 4.08 4.26 4.71 4.99 5.23

1200 RPM H.P.

H.P.

20° PRESSURE ANGLE 200 RPM

REFERENCE PAGE 43.

1” FACE

600 RPM

No. Teeth

864 961 1031 1196 1322 1482 1596 1704 1806 2047 2219 2375

900 RPM

Torque

20° PRESSURE ANGLE

100 RPM

12 DIAMETRAL PITCH CAST IRON 25 RPM

200 RPM

H.P. Torque H.P.

12 DIAMETRAL PITCH STEEL 25 RPM

20° PRESSURE ANGLE

900 RPM

Torque

H.P.

Torque

456 488 506 551 576 615 634 650 664

5.07 5.38 5.53

355 377 387

REFERENCE PAGE 44. 1200 RPM

1800 RPM

3600 RPM

H.P.

H.P.

H.P.

Torque

Torque

Torque

Ratings are based on strength calculation. Basic static strength rating, or for hand operation of above gears is approximately 3 times the 100 RPM rating. NOTE: Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute. They should be used for interpolation purposes only. *Torque Ratings (Lb. Ins.).

P-1930-BG

9/17

Boston Gear 800-825-6544

59

A

Spur Gears Approximate Horsepower and Torque* Ratings For Class I Service (Service Factor = 1.0) 10 DIAMETRAL PITCH STEEL

A

25 RPM

50 RPM

20° PRESSURE ANGLE

100 RPM

1200 RPM

1800 RPM

3600 RPM

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

12 14 15 16 18 20 24 25 28 30 35 40 45 48 50

.14 .19 .21 .23 .27 .31 .39 .41 .47 .52 .64 .75 .87 .92 .96

363 477 533 580 679 784 983 1032 1195 1300 1615 1896 2190 2328 2420

.28 .37 .42 .45 .53 .61 .76 .80 .92 1.00 1.24 1.44 1.66 1.76 1.83

358 469 525 571 667 768 958 1005 1161 1260 1558 1820 2092 2218 2301

.55 .72 .81 .88 1.02 1.17 1.45 1.52 1.74 1.88 2.31 2.67 3.05 3.21 3.32

333 431 479 518 599 682 834 870 990 1064 1284 1467 1649 1727 1777

1.51 1.95 2.16 2.32 2.67 3.02 3.65 3.80 4.29 4.59 5.47 6.18 6.88 7.16 7.34

318 409 453 488 561 635 767 799 901 964 1150 1299 1445 1504 1542

2.66 3.37 3.70 3.96 4.48 5.00 5.89 6.10 6.76 7.16 8.33 9.20 10.04 10.33 10.52

280 354 389 416 471 526 619 641 710 752 875 966 1054 1085 1105

3.57 4.46 4.87 5.18 5.79 6.41 7.41 7.64 8.37 8.80 10.08 10.99 11.85 12.12 12.29

250 312 341 363 406 449 519 535 586 616 706 770 830 849 861

4.30 5.31 5.78 6.12 6.79 7.45 8.50 8.74 9.50 9.94 11.27 12.17

226 279 303 321 356 391 447 459 499 522 592 639

5.40 6.58 7.10 7.47 8.19 8.90 9.98 10.21 10.99 11.42

189 230 249 262 287 311 349 358 385 400

7.27 8.63 9.22 9.60 10.33 11.04

127 151 161 168 181 193

1.06 1.37 1.52 1.64 1.90 2.16 2.65 2.76 3.14 3.38 4.08 4.65 5.23 5.48 5.64

10 DIAMETRAL PITCH CAST IRON 25 RPM

50 RPM

100 RPM

300 RPM

600 RPM

20° PRESSURE ANGLE 200 RPM

300 RPM

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

Torque

H.P.

Torque

55 60 70 80 90 100 120 140 160 200

.65 .71 .84 .98 1.09 1.20 1.45 1.66 1.91 2.30

1638 1778 2114 2462 2742 3016 3650 4177 4814 5802

1.23 1.33 1.57 1.81 2.00 2.18 2.59 2.93 3.32 3.90

1550 1675 1974 2279 2517 2746 3271 3688 4191 4920

2.22 2.38 2.77 3.15 3.43 3.70 4.30 4.74 5.28 5.99

1173 1243 1413 1576 1686 1786 2016 2167 2359 2573

4.80 5.05 5.65 6.22 6.58 6.89 7.64 8.09 8.69

1009 6.77 1061 7.01 1187 7.65 1307 8.23 1382 8.54 1448 8.80 1605 9.48 1699 1826

8 DIAMETRAL PITCH STEEL 25 RPM

50 RPM

3.72 3.94 4.48 5.00 5.35 5.67 6.40 6.88 7.49 8.17

1-1/4” FACE

600 RPM

No. Teeth

1400 1501 1743 1984 2162 2329 2709 2989 3329 3773

900 RPM

REFERENCE PAGE 44.

No. Teeth

349 456 509 552 642 737 913 956 1097 1187 1454 1685 1920 2026 2095

200 RPM

1-1/4” FACE

H.P.

H.P.

Torque

711 737 803 865 897 924 996

7.84 8.06

549 564

20° PRESSURE ANGLE

100 RPM

200 RPM

300 RPM

600 RPM

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

Torque

H.P.

Torque

H.P.

Torque

12 14 15 16 18 20 22 24 28 32 36

.27 .35 .39 .43 .50 .58 .66 .73 .88 1.06 1.22

678 890 996 1084 1268 1462 1651 1831 2224 2664 3082

.53 .69 .77 .84 .98 1.13 1.27 1.41 1.70 2.03 2.34

667 874 976 1061 1238 1424 1604 1775 2145 2557 2944

1.03 1.34 1.49 1.62 1.88 2.15 2.41 2.65 3.18 3.76 4.29

609 787 873 943 1086 1233 1371 1498 1768 2060 2321

2.74 3.51 3.88 4.18 4.77 5.39 5.95 6.46 7.54 8.68 9.68

576 738 816 877 1003 1131 1250 1357 1583 1824 2034

4.71 5.92 6.49 6.92 7.78 8.64 9.41 10.08 11.47 12.92 14.13

495 622 681 727 817 908 989 1059 1204 1358 1484

1.93 2.50 2.77 2.99 3.44 3.91 4.35 4.75 5.61 6.54 7.37

1200 RPM

1800 RPM

3600 RPM

H.P.

H.P.

H.P.

Torque

1-1/2” FACE

No. Teeth

647 843 939 1018 1183 1354 1518 1672 2003 2367 2703

900 RPM

Torque

REFERENCE PAGE 44.

900 RPM H.P.

Torque

6.19 434 7.68 537 8.35 585 8.85 620 9.84 689 10.82 758 11.67 817 12.39 868 13.88 972 15.44 1081 16.68 1168

Torque

Torque

REFERENCE PAGE 45.

1200 RPM

1800 RPM

3600 RPM

H.P.

Torque

H.P.

Torque

H.P.

7.35 9.01 9.76 10.30 11.35 12.38 13.27 14.00 15.51 17.10

386 473 513 541 596 650 698 735 815 898

9.03 10.91 11.73 12.30 13.40 14.47 15.36 16.08

316 382 411 431 469 507 538 563

Torque

11.72 205 13.81 242 14.70 257

Ratings are based on strength calculation. Basic static strength rating, or for hand operation of above gears is approximately 3 times the 100 RPM rating. NOTE: Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute. They should be used for interpolation purposes only. *Torque Ratings (Lb. Ins.).

60

Boston Gear 800-825-6544

P-1930-BG

9/17

Spur Gears Approximate Horsepower and Torque* Ratings For Class I Service (Service Factor = 1.0) 8 DIAMETRAL PITCH CAST IRON 25 RPM

50 RPM

100 RPM

20° PRESSURE ANGLE 200 RPM

300 RPM

600 RPM

No. Teeth

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

Torque

H.P.

Torque

H.P.

40 44 48 56 60 64 72 80 88 96 112 120 128

.84 .95 1.03 1.22 1.30 1.42 1.59 1.79 1.96 2.11 2.49 2.64 2.79

2111 2384 2587 3080 3283 3588 3997 4525 4929 5325 6266 6651 7028

1.59 1.79 1.93 2.28 2.42 2.64 2.91 3.27 3.53 3.79 4.39 4.63 4.85

2007 2256 2437 2876 3052 3322 3669 4119 4451 4772 5533 5830 6118

2.90 3.23 3.47 4.03 4.25 4.59 5.00 5.54 5.92 6.27 7.11 7.42 7.71

1550 1707 1809 2057 2146 2297 2458 2679 2816 2941 3250 3351 3444

6.40 6.99 7.35 8.23 8.53 9.07 9.59 10.34 10.76 11.15 12.13 12.43 12.69

1345 1469 1543 1729 1792 1905 2014 2173 2262 2341 2549 2610 2667

9.18 9.86 10.20 11.14 11.40 12.00 12.44 13.20 13.54 13.83

1928 2038 2184 2539 2676 2892 3151 3493 3729 3952 4483 4677 4860

6 DIAMETRAL PITCH STEEL 25 RPM

50 RPM

4.92 5.42 5.74 6.53 6.81 7.29 7.80 8.50 8.93 9.33 10.31 10.63 10.93

100 RPM

200 RPM

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

12 14 15 16 18 21 24 27 30

.63 .83 .93 1.01 1.18 1.46 1.70 1.98 2.25

1559 2097 2345 2551 2981 3671 4294 4986 5660

1.24 1.62 1.81 1.97 2.29 2.81 3.27 3.78 4.27

1565 2046 2284 2480 2889 3541 4122 4763 5381

2.38 3.10 3.45 3.73 4.32 5.25 6.05 6.94 7.77

50 RPM

H.P.

Torque

H.P.

Torque

33 36 42 48 54 60 66 72 84 96 108 120

1.53 1.71 2.04 2.38 2.74 3.01 3.38 3.65 4.30 4.82 5.47 5.97

3847 4316 5148 6009 6899 7591 8515 9200 10835 12152 13800 15059

2.89 3.23 3.81 4.41 5.02 5.48 6.10 6.54 7.59 8.39 9.40 10.13

3641 4066 4807 5563 6333 6910 7691 8245 9566 10579 11583 12770

100 RPM

300 RPM H.P.

200 RPM

3288 3644 4244 4843 5440 5860 6443 6827 7752 8404 9245 9793

8.74 9.58 10.91 12.21 13.46 14.26 15.44 16.12 17.83 18.90 20.37 21.20

900 RPM H.P.

Torque

REFERENCE PAGE 45. 1200 RPM

1800 RPM

3600 RPM

H.P.

H.P.

H.P.

Torque

Torque

Torque

964 10.72 751 1035 11.41 799 1072 11.72 821 1170 1198 1260 1307 1386 1422 1453

2” FACE

600 RPM

1200 RPM

1800 RPM

3600 RPM

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

1294 1647 1814 1945 2210 2613 2941 3241 3607

10.20 12.70 13.85 14.71 16.41 18.93 20.83 22.85 24.60

1072 1334 1455 1545 1724 1988 2188 2400 2584

13.06 16.02 17.35 18.30 20.18 22.91 24.88 26.98 28.75

915 1122 1215 1282 1413 1605 1743 1889 2013

15.19 18.42 19.85 20.85 22.79 25.61 27.56

798 967 1043 1095 1197 1345 1448

18.14 21.67 23.20 24.21 26.18

635 759 812 848 917

300 RPM

2” FACE

600 RPM

Torque

H.P.

Torque

H.P.

2755 3018 3439 3847 4243 4494 4864 5080 5620 5955 6420 6680

11.28 12.26 13.76 15.19 16.55 17.35 18.60 19.26 20.98 21.95 23.41

2370 2575 2891 3191 3477 3645 3907 4045 4407 4611 4917

15.90 17.02 18.62 20.09 21.48 22.14 23.39 23.90

900 RPM

REFERENCE PAGE 45 & 46.

Torque

20° PRESSURE ANGLE

H.P. Torque H.P.

5.22 5.78 6.73 7.68 8.63 9.30 10.22 10.83 12.30 13.33 14.67 15.54

Torque

1502 4.41 1391 6.16 1951 5.67 1786 7.84 2171 6.27 1977 8.64 2351 6.76 2129 9.26 2722 7.74 2440 10.52 3306 9.26 2919 12.44 3815 10.54 3322 14.00 4372 11.92 3755 15.66 4899 13.18 4155 17.17

6 DIAMETRAL PITCH CAST IRON 25 RPM

Torque

20° PRESSURE ANGLE

No. Teeth

No. Teeth

1-1/2” FACE

Torque

900 RPM H.P.

Torque

Torque

REFERENCE PAGE 46. 1200 RPM

1800 RPM

3600 RPM

H.P.

H.P.

H.P.

Torque

Torque

Torque

1670 18.42 1290 1788 19.56 1370 1955 2111 2256 2326 2457 2511

Ratings are based on strength calculation. Basic static strength rating, or for hand operation of above gears is approximately 3 times the 100 RPM rating. NOTE: Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute. They should be used for interpolation purposes only. *Torque Ratings (Lb. Ins.).

P-1930-BG

9/17

Boston Gear 800-825-6544

61

A

Spur Gears Approximate Horsepower and Torque* Ratings For Class I Service (Service Factor = 1.0) 5 DIAMETRAL PITCH STEEL

A

25 RPM

50 RPM

20° PRESSURE ANGLE

100 RPM

200 RPM

300 RPM

2-1/2” FACE

600 RPM

900 RPM

1800 RPM

3600 RPM

H.P.

H.P.

No. Teeth

H.P.

Torque

H.P.

Torque

H.P. Torque H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

Torque

H.P.

12 14 15 16 18 20

1.14 1.49 1.67 1.81 2.12 2.44

2865 3756 4198 4565 5332 6141

2.22 2.89 3.23 3.50 4.08 4.68

2794 3647 4069 4416 5138 5894

4.22 5.47 6.08 6.58 7.60 8.66

2431 3110 3435 3693 4216 4750

10.65 13.48 14.81 15.85 17.92 20.02

2237 2832 3112 3329 3766 4205

17.19 21.25 23.11 24.47 27.15 29.79

1805 2233 2427 2570 2852 3129

21.61 26.31 28.41 29.89 32.77 35.58

1513 1843 1990 2093 2295 2492

24.80 29.87 32.09 33.61 36.56 39.41

2662 3449 3833 4146 4789 5456

5 DIAMETRAL PITCH CAST IRON 25 RPM

50 RPM

No. Teeth

H.P.

Torque

H.P.

Torque

24 25 28 30 35 40 45 50 60 70 80 100 110 120 140 160 180

1.82 1.91 2.21 2.40 2.97 3.47 3.98 4.38 5.32 6.27 7.23 8.71 9.68 10.38 11.70 13.30 14.49

4599 4826 5571 6050 7477 8737 10040 11046 13399 15794 18229 21969 24409 26168 29508 33526 36534

3.48 3.64 4.18 4.52 5.54 6.42 7.31 7.98 9.53 11.06 12.59 14.78 16.22 17.19 18.97 21.13 22.61

4381 4588 5267 5700 6982 8087 9216 10056 12008 13945 15869 18630 20449 21669 23910 26631 28495

100 RPM

7.71 9.87 10.90 11.72 13.38 15.07

20° PRESSURE ANGLE 200 RPM

H.P. Torque H.P.

6.35 6.63 7.54 8.10 9.78 11.17 12.56 13.53 15.78 17.93 20.00 22.67 24.50 25.58 27.50 29.94 31.40

4002 4177 4750 5108 6164 7040 7916 8528 9944 11300 12605 14288 15439 16125 17334 18870 19787

Torque

10.82 3411 11.24 3542 12.60 3970 13.42 4230 15.85 4995 17.75 5593 19.59 6174 20.75 6540 23.48 7400 26.00 8192 28.34 8932 30.92 9745 32.88 10362 33.85 10666 35.49 11182 37.83 11921 38.97 12281

300 RPM

REFERENCE PAGE 46.

1200 RPM Torque

2-1/2” FACE

600 RPM

900 RPM

H.P.

Torque

H.P.

Torque

H.P.

Torque

14.15 14.64 16.23 17.18 19.98 22.08 24.09 25.25 28.05 30.58 32.92

2972 3075 3410 3609 4199 4639 5060 5304 5892 6425 6916

20.41 20.97 22.81 23.86 27.04 29.21 31.26 32.22 34.81

2144 2203 2396 2506 2840 3068 3284 3384 3657

23.95 24.51 26.37 27.41

1677 1716 1847 1920

Torque

Torque

1302 29.09 1019 1569 34.53 1209 1686 36.87 1291 1765 1920 2070

REFERENCE PAGE 46. 1200 RPM

1800 RPM

3600 RPM

H.P.

H.P.

H.P.

Torque

Torque

Torque

Ratings are based on strength calculation. Basic static strength rating, or for hand operation of above gears is approximately 3 times the 100 RPM rating. NOTE: Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute. They should be used for interpolation purposes only. *Torque Ratings (Lb. Ins.).

Gear Gauge Set 14-1/2° and 20° Pressure Angles

This handy, steel gear gauge set consists of 16 leaves — 24 gauges — to ­measure both 14-1/2° and 20° Pressure Angle tooth form, in diametral pitch sizes 64, 48, 32, 24, 20, 16, 12, 10, 8, 6, 5 and 4. Pitch sizes 8, 6, 5 and 4 both 14-1/2° and 20° are cut on individual leaves. Pitch sizes 64 through 10 inclusive, have both 14-1/2° and 20° Pressure Angles on a single leaf.

SOLD ONLY AS A COMPLETE SET ORDER BY CATALOG NUMBER OR ITEM CODE

62

Boston Gear 800-825-6544



Catalog Number

Item Code



Gear Gauge

06000

P-1930-BG

9/17