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Modified Stock Gearing - Boston Gear

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Spur <strong>Gear</strong>s<br />

Approximate Horsepower and Torque* Ratings<br />

For Class I Service (Service Factor = 1.0)<br />

12 DIAMETRAL PITCH STEEL 14 1 ⁄2° PRESSURE ANGLE 3/4" FACE REFERENCE PAGE 22.<br />

No. 25 RPM 50 RPM 100 RPM 200 RPM 300 RPM 600 RPM 900 RPM 1200 RPM 1800 RPM 3600 RPM<br />

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<br />

11 .05 119 .09 118 .18 116 .35 112 .51 108 .93 97 1.27 88.6 1.55 81.5 2.00 70 2.82 49.4<br />

12 .05 130 .10 129 .20 126 .38 120 .55 116 .99 104 1.35 94.4 1.64 86.3 2.10 73.6 2.92 51.1<br />

13 .06 149 .12 147 .23 144 .44 138 .63 132 1.12 118 1.51 106 1.83 96.3 2.33 81.6 3.19 55.9<br />

14 .07 169 .13 167 .26 163 .49 156 .71 149 1.25 131 1.68 118 2.03 107 2.56 89.6 3.46 60.6<br />

15 .07 189 .15 186 .29 181 .55 172 .78 164 1.37 144 1.83 128 2.20 116 2.76 96.6 3.69 64.6<br />

16 .08 209 .16 206 .32 200 .60 190 .86 180 1.50 157 1.99 139 2.38 125 2.96 103 3.91 68.5<br />

18 .10 249 .19 245 .38 237 .71 224 1.01 242 1.73 182 2.28 159 2.70 142 3.32 116 4.31 75.4<br />

20 .11 289 .23 284 .44 274 .82 257 1.15 215 1.95 205 2.54 178 2.99 157 3.64 127 4.65 81.4<br />

21 .12 310 .24 304 .47 293 .87 274 1.22 257 2.06 216 2.67 187 3.14 164 3.80 133 4.81 84.3<br />

22 .13 328 .26 322 .49 310 .92 288 1.28 270 2.15 226 2.78 195 3.25 171 3.92 137 4.93 86.2<br />

24 .14 365 .28 357 .54 343 1.01 317 1.41 296 2.33 245 2.98 209 3.47 182 4.14 145 5.14 90.0<br />

30 .19 483 .37 470 .71 447 1.29 407 1.78 373 2.85 299 3.57 250 4.09 215 4.78 167<br />

32 .21 529 .41 514 .77 488 1.40 442 1.92 403 3.05 320 3.80 266 4.32 227 5.02 176<br />

36 .24 605 .46 586 .88 552 1.57 495 2.13 448 3.33 349 4.09 286 4.62 243 5.31 186<br />

40 .27 682 .52 659 .98 617 1.74 547 2.34 492 3.59 377 4.37 306 4.90 257<br />

42 .28 715 .55 689 1.02 644 1.80 568 2.42 509 3.69 387 4.46 312 4.99 262<br />

A<br />

12 DIAMETRAL PITCH CAST IRON 14 1 ⁄2° PRESSURE ANGLE 3/4" FACE REFERENCE PAGE 23.<br />

No. 25 RPM 50 RPM 100 RPM 200 RPM 300 RPM 600 RPM 900 RPM 1200 RPM 1800 RPM 3600 RPM<br />

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<br />

48 .20 497 .38 477 .70 441 1.22 384 1.62 340 2.41 253 2.88 201 3.19 167<br />

54 .23 571 .43 545 .79 500 1.36 430 1.79 377 2.62 275 3.09 216 3.40 178<br />

60 .25 631 .48 600 .87 546 1.47 463 1.91 402 2.74 288 3.21 224<br />

64 .27 683 .51 647 .93 586 1.56 493 2.02 425 2.87 301 3.33 233<br />

72 .30 762 .57 718 1.02 644 1.69 533 2.17 455 3.01 316 3.46 242<br />

84 .36 896 .66 837 1.17 739 1.90 598 2.40 503 3.24 340<br />

96 .40 1014 .74 938 1.30 817 2.06 649 2.56 538 3.39 356<br />

108 .46 1148 .84 1054 1.44 906 2.24 706 2.76 579 3.58 376<br />

112 .47 1187 .86 1087 1.47 929 2.29 720 2.80 588 3.62 379<br />

120 .50 1264 .91 1150 1.55 975 2.37 748 2.89 607 3.69 387<br />

144 .59 1487 1.06 1333 1.75 1103 2.61 821 3.11 654 3.86 406<br />

168 .69 1745 1.22 1541 1.98 1248 2.87 905 3.38 710<br />

12 DIAMETRAL PITCH NON-METALLIC 14 1 ⁄2° PRESSURE ANGLE 3/4" FACE REFERENCE PAGE 23.<br />

No. 25 RPM 50 RPM 100 RPM 200 RPM 300 RPM 600 RPM 900 RPM 1200 RPM 1800 RPM 3600 RPM<br />

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<br />

15 .13 41 .20 42 .34 36 .45 31 .56 29 .72 25 1.15 20<br />

18 .19 60 .26 54 .43 45 .56 39 .68 36 .90 31 1.44 25<br />

21 .23 72 .31 65 .50 52 .66 46 .81 42 1.06 37 1.80 31<br />

24 .27 85 .36 76 .58 60 .76 53 .92 48 1.22 42 2.07 36<br />

30 .34 107 .44 92 .73 76 .95 66 1.14 60 1.56 54 2.64 46<br />

36 .40 126 .52 109 .82 86 1.13 79 1.36 71 1.83 64 3.18 56<br />

48 .51 161 .66 138 1.05 110 1.39 97 1.70 89 2.33 81<br />

60 .60 189 .80 168 1.29 135 1.72 120 2.13 112 2.95 103<br />

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.<br />

NOTE: 1. Ratings to right of heavy line are not recommended, as pitch line velocity exceeds 1000 feet per minute.<br />

They should be used for interpolation purposes only.<br />

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<br />

exceed 1000 FPM and are not subjected to shock loads.<br />

*Torque Ratings (Lb. Ins.).<br />

P-1930-BG 04/10 <strong>Boston</strong> <strong>Gear</strong> 800-825-6544 53

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