P 1930 Bg Spur Gears Literature Catalogs Brochures

P 1930 bg spur gears literature catalogs brochures

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Summary

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 7/21 www.bostongear.com 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
Style Without Keyway
A No. Hub See or Setscrew
of Pitch Page Catalog Item
Teeth Dia. Bore Dia. Proj. 323 Number Code
Face = .125”
48 Outside Dia. = Pitch Dia. + .042”
DIAMETRAL PITCH Overall Length = .125” + Hub Proj

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
FACE HUB 36 .750 G139 09344
PROJ. 40 .833 G140 09346
44 .917 G141 09348
48 1.000 G142 09350
54 1.125 G143 09352
PITCH HUB 60 1.250 G144 09354
BORE
DIA. DIA. 66 1.375 .250 .50 .25 G145 09356
72 1.500 G146 09358
84 1.750 G147 09360
96 2.000 G148 09362
OVERALL
100 2.083 G154 09364
LENGTH 120 2.500 G149 09366
.3125 .62 .31 D
144 3.000 G150 09368
192 4.000 G151 09370
32 Face = .062”
DIAMETRAL PITCH Outside Dia. = Pitch Dia. + .062”
STANDARD TOLERANCES BRASS
10 .312 – G96
DIMENSION TOLERANCE 09234
.125 –
14 .438 G98 09238
BORE All ±.0005
16 .500 G99 09240
20 .625 G101 09244
24 .750 .1875 – – G102 09246
28 .875 G103 09248
32 1.000 A G104 09250
40 1.250 – G106 G105 09252
.250 –
48 D.P. 32 D.P. 48 1.500 09254
48 D.P. 32 D.P. 64 2.000 G110 09256
80 2.500 .3125 – – G111 09258
96 3.000 G112 09260
112 3.500 G113 09262
128 4.000 .375 – – G114 09264
Face = .188”
8 .250 G159 09266
10 .312 G161 09268
REFERENCE PAGES 12 .375 .125 – – G163 09270
14 .438 G165 09272
Alterations — 322 15 .469 G166 09274
Lubrication — 322 16 .500 G167 09276
18 .562 G168 09278
Materials — 323 20 .625 G169 09280
22 .688 G170 09282
.1875 – – A
24 .750 G171 09284
26 .812 G172 09286
28 .875 G173 09288
30 .938 G174 09290
32 1.000 G175 09292
36 1.125 G176 09294
40 1.250 G177 09296
.250 – –
44 1.375 G178 09298
48 1.500 G179 09300
52 1.625 G180 09302
56 1.750 .3125 – – G181 09304
18 www.bostongear.com P-1930-BG 7/21
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.
of
Teeth
Pitch
Dia. Bore
Hub
Dia. Proj

See or Setscrew
Page Catalog Item
323 Number Code
Setscrew
Catalog Item
Number Code
A
Face = .188”
32 Outside Dia. = Pitch Dia. + .062”
DIAMETRAL PITCH Overall Length = .187” + Hub Proj

BRASS
64 2.000 .25 B G182 09306 – –
72 2.250 C G183 09308 – –
80 2.500 .62 G184 09310 – –
.3125
96 3.000 .31 D G185 09312 – –
112 3.500 G186 09314 – –
128 4.000 .75 G187 09316 – –
STEEL
16 .500 .1875 – – S3216 09572 – –
20 .625 S3220 09574 – –
.250 – –
22 .688 S3222 09576 – – FACE HUB
24 .750 .3125 – – S3224 09578 – – PROJ

28 .875 .375 – – S3228 09580 – –
32 1.000 .375 S3232 09582 – –
40 1.250 S3240 09584 – –
48 1.500 S3248 09586 – – PITCH HUB
BORE
56 1.750 .375 – – S3256 09588 – – DIA. DIA

64 2.000 S3264 09590 – –
80 2.500 S3280 09592 – –
96 3.000 S3296 09594 – –
16 .500 .39 – – H3216 09536 OVERALL
.1875 .31 – –
18 .562 .45 H3218 09538 LENGTH
20 .625 .52 A – – H3220 09540
.250 .31
22 .688 .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 STANDARD TOLERANCES
32 1.000 .75 .38 – – H3232 09552
40 1.250 – – H3240 09554 DIMENSION TOLERANCE
.88 .38
48 1.500 – – H3248 09556 BORE All ±.0005
56 1.750 – – H3256 09558
1.00 .38 – –
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 32
32 D.P

D.P. 24 D.P

24 D.P

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 G257 09206 – –
A
24 1.000 G258 09208 – – REFERENCE PAGES
30 1.250 .250 .62 .25 G259 09210 – –
36 1.500 G261 09212 – – Alterations — 322
42 1.750 .62 .25 G263 09214 – –
B Horsepower Ratings — 50
48 2.000 G264 09216 – –
54 2.250 .3125 G265 09218 – – Lubrication — 322
.69 .31 C Materials — 323
60 2.500 G266 09220 – –
66 2.750 G267 09222 – – Selection Procedure — 49
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 – –
P-1930-BG 7/21 www.bostongear.com 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
Style Without Keyway With Keyway
No. Hub See or Setscrew & Setscrew†
of Pitch Page Catalog Item Catalog Item
A Teeth

24
Dia. Bore Dia. Proj. 323 Number Code
Face = .250”
Number Code
Outside Dia. = Pitch Dia. + .083”
DIAMETRAL PITCH Overall Length = .250” + Hub Proj

STEEL
12 .500 – – S2412 09630 – –
.250
15 .625 – – S2415 09632 – –
16 .667 – – S2416 09634 – –
.3125
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 – –
FACE HUB 60 2.500 S2460 09650 – –
PROJ. 72 3.000 S2472 09652 – –
KEYWAY 12 .500 .36 – – H2412† 09596
14 .583 .250 .46 .31 A – – H2414† 09598
15 .625 .50 – – H2415‡ 09600
PITCH HUB 16 .667 .54 – – H2416‡ 09602
BORE
DIA. DIA. 18 .750 .3125 .62 .31 – – H2418‡ 09604
20 .833 .70 – – H2420 ‡ 09606
21 .875 .74 .31 – – H2421 ‡ 09608
24 1.000 .87 – – H2424‡ 09610
OVERALL 30 1.250 1.00 – – H2430‡ 09612
LENGTH 36 1.500 .375 1.12 – – H2436‡ 09614
.38
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 2.00 – – H2496‡ 09624
.500 .50
120 5.000 2.25 – – H24120‡ 09626
STANDARD TOLERANCES 144 6.000 2.25 – – H24144‡ 09628
Face = .375”
DIMENSION TOLERANCE 20 Outside Dia. = Pitch Dia. + .100”
BORE All ±.0005 DIAMETRAL PITCH Overall Length = .375” + Hub Proj

STEEL
11 .600* .46 NA11B 09662 NA11B-5/16** 46000
12 .600 .46 09664 NA12B-5/16** 46001
.3125 .38 NA12B
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
32
24 D.P

20 D.P

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

D.P. 16 .800 .375 .66 .38 NA16B 09672 NA16B-3/8†† 46005
18 .900 .74 NA18B 09674 NA18B-3/8†† 46006
.375 09676 NA20B-3/8†† 46007
20 1.000 .84 .38 NA20B
REFERENCE PAGES .500 – – NA20B-1/2†† 46008
.375 NA22B 09678 NA22B-3/8 †† 46009
22 1.100 .82 .38
Alterations — 322 .500 – – NA22B-1/2†† 46010
.375 09680 NA24-3/8†† 46011
Horsepower Ratings — 50, 51 24 1.200 .92 .38 NA24
.500 – – NA24-1/2†† 46012
Lubrication — 322 .375 NA25B 09682 NA25B-3/8 †† 46013
Materials — 323 25 1.250 .97 .38
.500 – – NA25B-1/2†† 46014
Selection Procedure — 49 .375 A NA28B 09684 NA28B-3/8†† 46015
28 1.400 1.12 .38
.500 – – NA28B-1/2†† 46016
*Special Pitch Diameter, used for calculating Center .375 NA30B 09686 NA30B-3/8 †† 46017
30 1.500 1.22 .38
Distance only, not Ratio. .500 – – NA30B-1/2†† 46018
.375 09688 NA32-3/8†† 46019
†H2412 & H2414 have #35 (.110) drilled hole through 32 1.600 1.32 .50 NA32
one wall, no keyway. .500 – – NA32-1/2†† 46020
.375 NA35 09690 NA35-3/8 †† 46021
35 1.750 1.47 .50
‡H2415-H24144 has one setscrew, no keyway. .500 – – NA35-1/2†† 46022
.375 09692 NA36-3/8†† 46023
**NA11B-5/16”-NA14B-5/16 bore has #35 (.110) drilled 36 1.800 1.52 .50 NA36
hole through one wall, no keyway. .500 – – NA36-1/2†† 46024
.375 NA40 09694 NA40-3/8†† 46025
††3/8” & 1/2” bores have one setscrew, no keyway. .500 NA40-1/2†† 46026
40 2.000 1.72 .50 – –
NA40-5/8” & NA40-3/4” bores have standard keyway .625 – – NA40-5/8 46027
at 90° to setscrew. See Page 323. .750 – – NA40-3/4 46028
48 2.400 1.33 NA48A 10208 – –
50 2.500 1.42 NA50A 10210 – –
.375 .50
60 3.000 1.92 NA60A 10212 – –
64 3.200 2.12 NA64A 10214 – –
20 www.bostongear.com P-1930-BG 7/21
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†
A
See
of Pitch Page Catalog Item Catalog Item
Teeth Dia. Bore Dia. Proj. 323 Number Code Number Code
Face = .375”
20 Outside Dia. = Pitch Dia. + .100”
DIAMETRAL PITCH Overall Length = .375” + Hub Proj

CAST IRON
70 3.500 .50 NA72 NA70 10216 – –
.375 1.25
72 3.600 10218 – –
B
80 4.000 NA80 10220 – –
84 4.200 NA84 10222 – –
90 4.500 .500 1.25 .50 NA90 10224 – –
C
96 4.800 NA96 10226 – –
100 5.000 NA100 10228 – –
112 5.600 NA112 10230 – –
120 6.000 NA120 10232 – –
.50 HUB
140 7.000 NA140 10234 – – FACE
1.50 D PROJ

144 7.200 .500 NA144 10236 – –
160 8.000 NA160 10238 – – KEYWAY
180 9.000 .62 NA180 10240 – –
200 10.000 2.25 NA200B 10242 – –
Face = .313” PITCH HUB
BORE
16 Outside Dia. = Pitch Dia. + .125” DIA. DIA

DIAMETRAL PITCH Overall Length = Face + Hub Proj

BRASS
8 .500 G226 09168 – – OVERALL
.1875 – –
9 .563 G227 09170 – – LENGTH
10 .625 G228 09172 – –
12 .750 G229 09174 – –
14 .875 A G230 09176 – –
.250 – –
16 1.000 G231 09178 – –
18 1.125 G232 09180 – –
20 1.250 G233 09182 – –
24 1.500 .3125 – – G235 09184 – – STANDARD TOLERANCES
28 1.750 – – G236 09186 – –
32 2.000 B G237 09188 – – DIMENSION TOLERANCE
40 2.500
.3125 .75 .31 G238 09190 – – BORE All ±.0005
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 20 D.P

20 D.P. 16 D.P

16 D.P

12 .750 .56 09706 NB12B-3/8† 46030
13 .813 .375 .44 NB12B
.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 REFERENCE PAGES
16 1.000 .500 .81 .44 NB16B 09714 NB16B-1/2† 46034
18 1.125 .94 NB18B 09716 NB18B-1/2† 46035 Alterations — 322
.500 09718 NB20B-1/2† 46036
20 1.250 .96 .44 NB20B Horsepower Ratings — 51, 52
.625 – – NB20B-5/8 46037
.500 NB22B 09720 NB22B-1/2† 46038
Lubrication — 322
22 1.375 1.08 .44 Materials — 323
.625 – – NB22B-5/8 46039
.500 NB24B 09722 NB24B-1/2† 46040 Selection Procedure — 49
24 1.500 .625 1.20 .44 A – – NB24B-5/8 46041
.750 – – NB24B-3/4 46042 *Special Pitch Diameter, used for calculating Center
.500 NB26B 09724 NB26B-1/2† 46043 Distance only, not Ratio

26 1.625 .625 1.33 .44 – – NB26B-5/8 46044 †3/8” and 1/2” bores have one setscrew, no keyway

.750 – – NB26B-3/4 40645
.500 NB28B 09726 NB28B-1/2† 46046 5/8” bore and larger have standard keyway at 90° to
28 .625 setscrew. See Page 323

.50 – – NB28B-5/8 46047
1.750 1.45
.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 7/21 www.bostongear.com 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
A No.
of
Teeth Dia. Bore
Hub See
Pitch Page Catalog Item
or Setscrew
Dia. Proj. 323 Number Code
and Setscrew†
Catalog
Number
Item
Code
Face = .500”
16 Outside Dia. = Pitch Dia. + .125”
DIAMETRAL PITCH 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
HUB 16 1.000 .81 .50 QBH16
FACE 09014 – –
PROJ. .375
20 1.250 1.06 QBH20 09018 – –
KEYWAY 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 – –
PITCH HUB 64 4.000 – – QB64 09006 – –
DIA. BORE DIA

CAST IRON
54 3.375 1.25 .50 NB54 10248 – –
56 3.500 .500 1.25 .50 B NB56 10250 – –
OVERALL
60 3.750 1.38 .62 NB60 10252 – –
LENGTH 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 1.50 .62 NB84 10260 – –
.625
96 6.000 1.50 NB96 10262 – –
112 7.000 1.50 NB112 10264 – –
STANDARD TOLERANCES 120 7.500 1.50 NB120 10266 – –
128 8.000 1.50 D NB128 10268 – –
DIMENSION TOLERANCE 144 9.000 1.75 NB144 10270 – –
BORE All ±.0005 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
16 D.P

16 D.P. 12
12 D.P

D.P. 12 1.000 .500 .75 .50 ND12B 09746 ND12B-1/2† 46061
13 1.083 .83 ND13B 09748 ND13B-1/2† 46062
14 1.167 .92 ND14B 09750 ND14B-1/2† 46063
REFERENCE PAGES 15 1.250 1.00 ND15B 09752 ND15B-5/8 46064
16 1.333 .625 .99 .50 ND16B 09754 ND16B-5/8 46065
Alterations — 322 18 1.500 1.15 ND18B 09756 ND18B-5/8 46066
.625 .50 ND20B
Horsepower Ratings — 52, 53 09758 ND20B-5/8 46067
20 1.667 1.32
.750 – – ND20B-3/4 46068
Lubrication — 322 .625 ND21B 09760 ND21B-5/8 46069
Materials — 323 21 1.750 .750 1.40 .50 – – ND21B-3/4 46070
Selection Procedure — 49 .875 A – – ND21B-7/8 46071
.625 ND22B 09762 ND22B-5/8 46072
22 .750 .50 – –
*Special Pitch Diameter, used for calculating Center ND22B-3/4 46073
1.833 1.49
Distance only, not Ratio. .875 – – ND22B-7/8 46074
1.000 – – ND22B-1 46075
†1/2” bore has one setscrew, no keyway

.625 ND24B 09764 ND24B-5/8 46076
5/8” bore and larger have standard keyway at 90° to 24 .750 .50 – – ND24B-3/4 46077
setscrew. See Page 323. 2.000 1.65
.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 – –
22 www.bostongear.com P-1930-BG 7/21
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
A
No. Hub See or Setscrew and Setscrew†
of Pitch Page Catalog Item Catalog Item
Teeth Dia. Bore Dia. Proj. 323 Number Code Number Code
Face = .750”
12 Outside Dia. = Pitch Dia. + .167”
DIAMETRAL PITCH 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 2.25 QDH30 09052 – –
.625
36 3.000 – – QD36 09026 – –
48 4.000 – – QD48 09030 – –
60 5.000 .750 – – QD60 09034 – –
CAST-IRON
FACE HUB
48 4.000 ND48 10284 – – PROJ

54 4.500 C ND54 10286 – –
60 5.000 .75 ND60 10288 – –
.750 1.75
64 5.333 ND64 10290 – –
72 6.000 ND72 10292 – –
84 7.000 ND84 10294 – – PITCH HUB
BORE
DIA. DIA

96 8.000 ND96 10296 – –
108 9.000 .750 2.00 D ND108 10298 – –
.75
112 9.333 ND112 10300 – –
120 10.000 ND120 10302 – –
144 12.000 .875 2.00 1.00 ND144 10304 – – OVERALL
LENGTH
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 STANDARD TOLERANCES
14 1.400 1.02 NF14B 09782 NF14B-5/8 46082 DIMENSION TOLERANCE
15 1.500 1.12 .62 NF15B 09784 NF15B-3/4 46083
.750 BORE All ±.0005
16 1.600 1.22 NF16B 09786 NF16B-3/4 46084
.750 .62 NF18B 09788 NF18B-3/4 46085
18 1.800 1.42
.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
12 D.P. 10 D.P

1.000 – – NF24B-1 46092 12 D.P. 10 D.P

25 2.500 .750 2.12 .62 NF25 09794 – –
28 2.800 1.81 NF28A 10310 – – REFERENCE PAGES
30 3.000 2.02 NF30A 10312 – –
32 3.200 .750 2.22 .88 NF32A 10314 – – Alterations — 322
35 3.500 2.52 NF35A 10316 – –
36 3.600 2.61 NF36A 10318 – – Horsepower Ratings — 53, 54
NON-METALLIC Lubrication — 322
Materials — 323
15 1.500 1.20 .62 QFH15 09062 – –
18 1.800 .625 1.50 QFH18 09066 – – Selection Procedure — 49
20 2.000 1.70 A QFH20 09068 – –
25 2.500 .750 2.20 .62 QFH25 09070 – – *Special Pitch Diameter, used for calculating Center
30 3.000 2.70 QFH30 09072 – – Distance only, not Ratio

†All gears have standard keyway at 90° to setscrew

See Page 323

P-1930-BG 7/21 www.bostongear.com 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
A No. Hub See or Setscrew and Setscrew†
of Pitch Page Catalog Item Catalog Item
Teeth Dia. Bore Dia. Proj. 323 Number Code Number Code
Face = 1.000”
10 Outside Dia. = Pitch Dia. + .200”
DIAMETRAL PITCH 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 – –
HUB
70 7.000 NF70 10338 – –
FACE PROJ. 72 7.200 NF72 10340 – –
80 8.000 NF80 10342 – –
KEYWAY 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 – –
PITCH HUB
DIA. BORE DIA. 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 – –
OVERALL
LENGTH 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
STANDARD TOLERANCES 11 1.500* 1.12 NH11B 09806 NH11B-3/4 46093
12 1.500 .750 1.12 .75 NH12B 09808 NH12B-3/4 46094
DIMENSION TOLERANCE 14 1.750 1.31 NH14B 09810 NH14B-3/4 46095
15 1.875 .875 1.43 .75 NH15B 09812 NH15B-7/8 46096
BORE All ±.0005
.875 NH16B 09814 NH16B-7/8 46097
16 2.000 1.56 .75
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
10D.P

10 D.P. 88 D.P

D.P. .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 – –
REFERENCE PAGES 28 3.500 .875 2.56 .88 NH28A 10370 – –
30 3.750 2.75 NH30A 10372 – –
Alterations — 322 32 4.000 1.000 3.00 .88 NH32A 10374 – –
Horsepower Ratings — 54, 55 NON-METALLIC
Lubrication — 322 16 2.000 .750 1.62 .75 QHH16 09082 – –
Materials — 323 18 2.250 1.88 QHH18 09084 – –
Selection Procedure — 49 20 2.500 2.12 A QHH20 09086 – –
24 3.000 .875 2.62 .75 QHH24 09088 – –
28 3.500 3.12 QHH28 09090 – –
*Special Pitch Diameter, used for calculating Center
Distance only, not Ratio

†All gears have standard keyway, at 90° to setscrew

See Page 323

24 www.bostongear.com P-1930-BG 7/21
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
A
No. Hub See or Setscrew and Setscrew†
of Pitch Page Catalog Item Catalog Item
Teeth Dia. Bore Dia. Proj. 323 Number Code Number Code
Face = 1.250”
8 Outside Dia. = Pitch Dia. + .250”
DIAMETRAL PITCH 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 – – FACE HUB
80 10.000 NH80 10396 – – PROJ

84 10.500 NH84 10398 – –
88 11.000 D NH88 10400 – –
96 12.000 1.125 NH96 10402 – –
3.00 1.12
112 14.000 NH112 10404 – – PITCH HUB
120 15.000 NH120 10406 – – BORE
DIA. DIA

128 16.000 NH128 10408 – –
144 18.000 NH144 10410 – –
160 20.000 1.125 3.25 1.25 NH160B 10412 – –
Face = 1.500” OVERALL
6 Outside Dia. = Pitch Dia + .333” LENGTH

DIAMETRAL PITCH Overall Length = 1.500” + Hub Proj

STEEL
11 2.000* 1.000 .88 NJ11B 09830 NJ11B-1 46108
1.46
12 2.000 NJ12B 09832 NJ12B-1 46109
1.000 NJ14B 09834 NJ14B-1 46110
14 2.333 1.125
1.79 .88
– – NJ14B-1-1/8 46111 STANDARD TOLERANCES
1.000 NJ15B 09836 NJ15B-1 46112
1.125 – – NJ15B-1-1/8 46113 DIMENSION TOLERANCE
15 2.500 1.96 .88
1.1875 – – NJ15B-1-3/16 46114 BORE All ±.0005
1.250 – – NJ15B-1-1/4 46115
1.000 NJ16B 09838 NJ16B-1 46116
1.125 – – NJ16B-1-1/8 46117
16 2.667 2.13 .88
1.1875 A – – NJ16B-1-3/16 46118
1.250 – – NJ16B-1-1/4 46119
1.000 NJ18B 09840 NJ18B-1 46120
1.125 – – NJ18B-1-1/8 46121
18 3.000 2.46 .88
1.1875 – – NJ18B-1-3/16 46122
1.250 – – NJ18B-1-1/4 46123 88 D.P

D.P. 6 D.P

6 D.P

1.000 NJ20 09842 NJ20-1 46124
1.125 – – NJ20-1-1/8 46125
20 3.333 2.79 .88
1.1875 – – NJ20-1-3/16 46126
1.250 – – NJ20-1-1/4 46127 REFERENCE PAGES
21 3.500 1.000 2.96 .88 NJ21B 09844 – –
24 4.000 3.00 NJ24A 10414 – – Alterations — 322
27 4.500 1.125 3.50 .88 NJ27A 10416 – – Horsepower Ratings — 55, 56
30 5.000 4.00 NJ30A 10418 – –
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 7/21 www.bostongear.com 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
Style Without Keyway
A No. Hub See or Setscrew
of Pitch Page Catalog Item
Teeth Dia. Bore Dia. Proj. 323 Number Code
Face = 1.500˝
6 Outside Dia. = Pitch Dia + .333˝
DIAMETRAL PITCH 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 NJ40 10426
C
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
HUB 72 12.000 1.25 D NJ72 10440
FACE
PROJ. 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
PITCH HUB 144 24.000 3.75 NJ144B 10452
BORE
DIA. DIA. Face = 1.750”
5 Outside Dia. = Pitch Dia. + .400”
DIAMETRAL PITCH Overall Length = 1.750” + Hub Proj

STEEL
OVERALL
LENGTH 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
STANDARD TOLERANCES CAST IRON
DIMENSION TOLERANCE 24 4.800 A NK24B 10454
BORE All ±.0005 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 NK60B 10470
70 14.000 D NK70B 10472
80 16.000 NK80B 10474
66D.P

D.P. 55D.P

D.P. 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 www.bostongear.com P-1930-BG 7/21

Spur Gears ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE Style Without Keyway With Keyway No. Hub See or Setscrew & Setscrew† of Pitch Page CatalogItemCatalog Item Teeth Dia. Bore Dia. Proj. 323 Number Code Number Code Face = …

Section Contents 18 www.bostongear.com1930G 721 A Spur Gears 48 D.P. 32 D.P. STANDARD TOLERANCES G96DIMENSIONTOLERANCE BORE All±.0005 48 and 32 Diametral Pitch (Brass) 14-1/2° Pressure Angle (will not operate with 20° spurs) REFERENCE PAGES Alterations — 322 Lubrication — 322 Materials — 323 48 D.P. 32 D.P. BORE HUB DIA. HUB …

P1930BG 721www.bostongear.com 307 I Engineering Information Spur Gears Gear Nomenclature (Continued) PITCH CIRCLE is the circle derived from a number of teeth and a specified diametral or circular pitch. Circle on which spacing or tooth profiles is established and from which the tooth proportions are constructed.

Boston Gear 1930G 721www.bostongear.com 13 Boston Gear nParallel Shaft Applications nReliability from Steel, Cast Iron and Brass nMore Cost Effective, Quieter Running and Corrosion-Resistant Operation from Non- Metallic Options nHigher Load Carrying Capacity with 20° PA (Pressure Angle) nHigher Contact Ratio for a Smoother,

P1930BG 721www.bostongear.com 333 I Index to Catalog Numbers 0-B(L)G* Chain Tensioners 302 0-H(U)G* Chain Tensioners 304 06000 Gear Gauge Set 62 06724* Thrust Washers 118 1 (A. AA) Ladder Chains 262 2 (1/2) Ladder Chains 262 2S(S)C12* Clamp Collars 2S(S)C25* Clamp Collars 117 3A-1/2* Adj. Shaft Supports 231

We can modify most stock gears to meet your requirements and ship it within 24 hours. The full range of modifications we can provide are shown below. With Boston Gear, stock gear modifications are quick and easy. Give us a call at 800-825-6544. Keyways and bores metric sizes. 4 www.bostongear.com1930G 721

1930G 721www.bostongear.com 5 Custom Gearing “Request For Quotation” Form FAX to800-387-0130. Or give us a call at 800-816-5608. Spur Helical Miter Bevel Worm Worm Gear No. of Teeth Pitch (DP, CP MOD) Pressure Angle Helix Angle Hand (LH, RH) Material Face Width Length Through Bore Hub Diameter Hub Projection Bore Diameter Keyway

Altra Industrial Motion 300 Granite Street, Suite 201 Braintree, MA 02184 Phone: 781-917-0600 Fax: 781-843-0709

Frequently Asked Questions

What are the ratings of a boston spur gear?

Boston Spur Gear ratings. METALLIC SPUR GEARS W = Tooth Load, Lbs. (along the Pitch Line) S = Safe Material Stress (static) Lbs. per Sq. In. (Table II) F = Face Width, In. Y = Tooth Form Factor (Table I) P = PDiametral Pitch D = cosPitch Diameter V = Pitch Line Velocity, Ft. per Min. = .262 x D x RPM

What is undercutting on 14 12 gears?

On 14-1/2°PA gears undercutting occurs where a number of teeth is less than 32 and for 20°PA less than 18. Since this condition becomes more severe as tooth numbers decrease,

What type of gears are spiral and helical gears?

spur and helical gears are of involute form. An involute is a curve that is traced by a point on a taut cord unwinding from a circle, which is called a BASECIRCLE. The involute is a form of spiral, the curvature of which becomes

Why does my pinion gear interfere with my internal spur gears?

In a similar manner INTERNAL Spur Gear teeth may interfere when the pinion gear is too near the size of its mating internal gear. The following may be used as a guide to assure prop-

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