Modified Stock Gearing - Boston Gear

Spur Gears
Approximate Horsepower and Torque* Ratings
For Class I Service (Service Factor = 1.0)
A
16 DIAMETRAL PITCH STEEL 14 1 ⁄2° PRESSURE ANGLE 1/2" FACE REFERENCE PAGE 21 & 22.
No. 25 RPM 50 RPM 100 RPM 200 RPM 300 RPM 600 RPM 900 RPM 1200 RPM 1800 RPM 3600 RPM
Teeth 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 .02 44.9 .04 44.5 .07 43.9 .14 42.7 .20 41.5 .36 38.3 .51 35.6 .63 33.2 .84 29.4 1.24 21.7
12 .02 48.9 .04 48.5 .08 47.8 .15 46.3 .21 44.9 .39 41.2 .54 38.1 .67 35.4 .89 31 1.29 22.6
13 .02 56.1 .04 55.6 .09 54.7 .17 52.9 .24 51.2 .44 46.7 .61 42.9 .76 39.7 .99 34.6 1.42 24.9
14 .03 63.8 .05 63.2 .10 62 .19 59.8 .28 57.8 .50 52.4 .68 47.9 .84 44.2 1.09 38.2 1.55 27.1
15 .03 71.1 .06 70.3 .11 68.9 .21 66.4 .30 63.9 .55 57.6 .75 52.5 .92 48.1 1.18 41.3 1.66 29.0
16 .03 78.7 .06 77.8 .12 76.2 .23 73.1 .33 70.3 .60 63 .82 57.1 .99 52.2 1.27 44.5 1.77 30.9
18 .04 93.8 .07 99.6 .14 90.5 .27 86.5 .39 82.8 .70 73.4 .94 65.9 1.14 59.8 1.44 50.4 1.96 34.3
20 .04 109 .09 107 .17 105 .32 99 .45 94.9 .79 83.2 1.06 74.1 1.27 66.7 1.59 55.7 2.13 37.2
22 .05 124 .10 122 .19 118 .36 112 .51 106 .88 92.3 1.16 81.5 1.39 72.9 1.72 60.3 2.27 39.7
24 .05 138 .11 135 .21 131 .39 124 .56 117 .96 100 1.26 88 1.49 78.3 1.83 64.2 2.38 41.7
26 .06 154 .12 151 .23 146 .43 137 .61 129 1.04 110 1.36 95.4 1.61 84.4 1.96 68.6 2.51 43.9
28 .07 168 .13 165 .25 160 .47 149 .66 140 1.12 118 1.45 102 1.71 89.6 2.06 72.3 2.62 45.8
30 .07 182 .14 179 .27 172 .51 160 .71 149 1.19 125 1.53 107 1.79 93.8 2.15 75.1 2.69 47.1
32 .08 200 .16 196 .30 188 .55 174 .77 162 1.28 134 1.63 114 1.90 99.7 2.27 79.4 2.81 49.3
36 .09 228 .18 223 .34 213 .62 196 .86 181 1.40 147 1.77 124 2.05 107 2.42 84.6
40 .10 258 .20 251 .38 239 .69 217 .95 200 1.52 160 1.91 134 2.18 115 2.55 89.4
48 .12 314 .24 304 .45 286 .81 257 1.11 232 1.73 181 2.12 149 2.40 126 2.76 96.5
16 DIAMETRAL PITCH CAST IRON 14 1 ⁄2° PRESSURE ANGLE 1/2" FACE REFERENCE PAGE 22.
No. 25 RPM 50 RPM 100 RPM 200 RPM 300 RPM 600 RPM 900 RPM 1200 RPM 1800 RPM 3600 RPM
Teeth 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
54 .09 217 .17 209 .31 196 .55 173 .74 156 1.13 119 1.38 96.6 1.54 81.1
56 .09 224 .17 216 .32 202 .57 178 .76 160 1.16 121 1.40 98.1 1.57 82.2
60 .10 239 .18 231 .34 214 .60 188 .80 167 1.20 126 1.44 100 1.60 84.2
64 .10 260 .20 249 .37 231 .64 201 .85 178 1.26 132 1.50 105 1.67 87.5
72 .12 290 .22 277 .40 255 .69 219 .91 192 1.33 140 1.57 110
80 .13 327 .25 311 .45 283 .76 240 .99 208 1.42 149 1.66 116
84 .14 342 .26 325 .47 294 .79 248 1.02 214 1.45 152 1.69 118
96 .15 388 .29 365 .52 327 .86 271 1.10 231 1.53 161 1.76 123
112 .18 455 .34 425 .60 376 .97 304 1.22 256 1.65 173
120 .19 486 .36 452 .63 396 1.01 318 1.26 265 1.69 177
128 .20 516 .38 477 .66 415 1.05 330 1.30 274 1.72 181
144 .23 574 .42 527 .72 453 1.12 353 1.38 289 1.79 188
160 .26 648 .47 590 .79 500 1.22 384 1.48 311 1.89 198
192 .307 762 .54 683 .90 566 1.34 421 1.60 335
16 DIAMETRAL PITCH NON-METALLIC 14 1 ⁄2° PRESSURE ANGLE 1/2" FACE REFERENCE PAGE 22.
No. 25 RPM 50 RPM 100 RPM 200 RPM 300 RPM 600 RPM 900 RPM 1200 RPM 1800 RPM 3600 RPM
Teeth 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 .06 19 .09 19 .15 16 .20 14 .25 13 .32 11 .56 9
20 .09 28 .12 30 .20 21 .26 18 .32 17 .42 15 .69 12
24 .11 34 .15 31 .24 25 .31 22 .38 20 .50 17 .82 14
32 .14 44 .19 40 .31 32 .40 28 .49 26 .65 23 1.12 20
40 .18 57 .24 50 .38 40 .49 34 .62 32 .82 29 1.41 25
48 .21 63 .28 58 .44 46 .60 40 .72 37 .96 33 1.65 29
64 .26 82 .34 71 .54 57 .72 50 .88 46 1.20 42
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 04/10