Modified Stock Gearing - Boston Gear

Spur Gears
Approximate Horsepower and Torque* Ratings
For Class I Service (Service Factor = 1.0)
A
10 DIAMETRAL PITCH STEEL 20° PRESSURE ANGLE 1-1/4" FACE REFERENCE PAGE 44.
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
12 .14 363 .28 358 .55 349 1.06 333 1.51 318 2.66 280 3.57 250 4.30 226 5.40 189 7.27 127
14 .19 477 .37 469 .72 456 1.37 431 1.95 409 3.37 354 4.46 312 5.31 279 6.58 230 8.63 151
15 .21 533 .42 525 .81 509 1.52 479 2.16 453 3.70 389 4.87 341 5.78 303 7.10 249 9.22 161
16 .23 580 .45 571 .88 552 1.64 518 2.32 488 3.96 416 5.18 363 6.12 321 7.47 262 9.60 168
18 .27 679 .53 667 1.02 642 1.90 599 2.67 561 4.48 471 5.79 406 6.79 356 8.19 287 10.33 181
20 .31 784 .61 768 1.17 737 2.16 682 3.02 635 5.00 526 6.41 449 7.45 391 8.90 311 11.04 193
24 .39 983 .76 958 1.45 913 2.65 834 3.65 767 5.89 619 7.41 519 8.50 447 9.98 349
25 .41 1032 .80 1005 1.52 956 2.76 870 3.80 799 6.10 641 7.64 535 8.74 459 10.21 358
28 .47 1195 .92 1161 1.74 1097 3.14 990 4.29 901 6.76 710 8.37 586 9.50 499 10.99 385
30 .52 1300 1.00 1260 1.88 1187 3.38 1064 4.59 964 7.16 752 8.80 616 9.94 522 11.42 400
35 .64 1615 1.24 1558 2.31 1454 4.08 1284 5.47 1150 8.33 875 10.08 706 11.27 592
40 .75 1896 1.44 1820 2.67 1685 4.65 1467 6.18 1299 9.20 966 10.99 770 12.17 639
45 .87 2190 1.66 2092 3.05 1920 5.23 1649 6.88 1445 10.04 1054 11.85 830
48 .92 2328 1.76 2218 3.21 2026 5.48 1727 7.16 1504 10.33 1085 12.12 849
50 .96 2420 1.83 2301 3.32 2095 5.64 1777 7.34 1542 10.52 1105 12.29 861
10 DIAMETRAL PITCH CAST IRON 20° PRESSURE ANGLE 1-1/4" FACE REFERENCE PAGE 44.
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
55 .65 1638 1.23 1550 2.22 1400 3.72 1173 4.80 1009 6.77 711 7.84 549
60 .71 1778 1.33 1675 2.38 1501 3.94 1243 5.05 1061 7.01 737 8.06 564
70 .84 2114 1.57 1974 2.77 1743 4.48 1413 5.65 1187 7.65 803
80 .98 2462 1.81 2279 3.15 1984 5.00 1576 6.22 1307 8.23 865
90 1.09 2742 2.00 2517 3.43 2162 5.35 1686 6.58 1382 8.54 897
100 1.20 3016 2.18 2746 3.70 2329 5.67 1786 6.89 1448 8.80 924
120 1.45 3650 2.59 3271 4.30 2709 6.40 2016 7.64 1605 9.48 996
140 1.66 4177 2.93 3688 4.74 2989 6.88 2167 8.09 1699
160 1.91 4814 3.32 4191 5.28 3329 7.49 2359 8.69 1826
200 2.30 5802 3.90 4920 5.99 3773 8.17 2573
8 DIAMETRAL PITCH STEEL 20° PRESSURE ANGLE 1-1/2" FACE REFERENCE PAGE 45.
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
12 .27 678 .53 667 1.03 647 1.93 609 2.74 576 4.71 495 6.19 434 7.35 386 9.03 316 11.72 205
14 .35 890 .69 874 1.34 843 2.50 787 3.51 738 5.92 622 7.68 537 9.01 473 10.91 382 13.81 242
15 .39 996 .77 976 1.49 939 2.77 873 3.88 816 6.49 681 8.35 585 9.76 513 11.73 411 14.70 257
16 .43 1084 .84 1061 1.62 1018 2.99 943 4.18 877 6.92 727 8.85 620 10.30 541 12.30 431
18 .50 1268 .98 1238 1.88 1183 3.44 1086 4.77 1003 7.78 817 9.84 689 11.35 596 13.40 469
20 .58 1462 1.13 1424 2.15 1354 3.91 1233 5.39 1131 8.64 908 10.82 758 12.38 650 14.47 507
22 .66 1651 1.27 1604 2.41 1518 4.35 1371 5.95 1250 9.41 989 11.67 817 13.27 698 15.36 538
24 .73 1831 1.41 1775 2.65 1672 4.75 1498 6.46 1357 10.08 1059 12.39 868 14.00 735 16.08 563
28 .88 2224 1.70 2145 3.18 2003 5.61 1768 7.54 1583 11.47 1204 13.88 972 15.51 815
32 1.06 2664 2.03 2557 3.76 2367 6.54 2060 8.68 1824 12.92 1358 15.44 1081 17.10 898
36 1.22 3082 2.34 2944 4.29 2703 7.37 2321 9.68 2034 14.13 1484 16.68 1168
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 04/10