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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 />

A<br />

6 DIAMETRAL PITCH CAST IRON 14 1 ⁄2° PRESSURE ANGLE 1-1/2" FACE REFERENCE PAGE 26.<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 />

32 .98 2470 1.86 2341 3.36 2120 5.66 1783 7.32 1539 10.38 1090 12.06 844<br />

33 1.01 2543 1.91 2406 3.45 2173 5.78 1821 7.46 1567 10.51 1104<br />

36 1.12 2813 2.10 2650 3.77 2375 6.24 1967 7.99 1678 11.09 1165<br />

40 1.25 3163 2.35 2962 4.17 2628 6.80 2144 8.62 1811 11.76 1235<br />

42 1.31 3310 2.45 3090 4.33 2728 7.02 2211 8.85 1858 11.97 1257<br />

48 1.51 3814 2.80 3530 4.88 3073 7.75 2441 9.64 2025 12.75 1339<br />

54 1.73 4364 3.18 4005 5.46 3440 8.52 2683 10.47 2199 13.59 1427<br />

60 1.90 4801 3.47 4371 5.88 3706 9.02 2842 10.97 2305 14.00 1471<br />

64 2.05 5177 3.72 4688 6.26 3944 9.50 2993 11.48 2411 14.50 1523<br />

66 2.11 5322 3.81 4807 6.39 4027 9.65 3040 11.62 2442 14.62 1536<br />

72 2.28 5750 4.09 5153 6.77 4267 10.08 3175 12.03 2528 14.94 1569<br />

84 2.66 6695 4.69 5912 7.60 4790 11.02 3473 12.96 2724<br />

96 2.98 7510 5.19 6538 8.24 5193 11.68 3680 13.56 2849<br />

108 3.35 8436 5.75 7246 8.97 5652 12.45 3924 14.31 3006<br />

120 3.65 9205 6.19 7806 9.50 5987 12.96 4083<br />

144 4.23 10664 7.01 8831 10.43 6571 13.79 4347<br />

5 DIAMETRAL PITCH STEEL 14 1 ⁄2° PRESSURE ANGLE 1-3/4" FACE REFERENCE PAGE 26.<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 .63 1583 1.23 1546 2.35 1479 4.31 1360 5.99 1258 9.79 1028 12.41 869 14.33 753 16.96 594<br />

12 .68 1723 1.33 1680 2.54 1600 4.64 1462 6.40 1345 10.33 1085 12.99 910 14.91 783 17.49 613<br />

14 .89 2241 1.73 2176 3.26 2057 5.89 1855 8.04 1689 12.68 1332 15.70 1099 17.82 936 20.60 721<br />

15 .99 2491 1.92 2415 3.61 2275 6.47 2039 8.79 1847 13.71 1441 16.86 1181 19.05 1000 21.88 766<br />

16 1.09 2754 2.11 2664 3.97 2501 7.07 2227 9.56 2008 14.76 1550 18.03 1262 20.27 1065<br />

18 1.30 3275 2.50 3156 4.67 2942 8.22 2590 11.01 2313 16.68 1752 20.13 1410 22.46 1179<br />

20 1.50 3793 2.89 3640 5.35 3370 9.31 2934 12.36 2597 18.40 1933 21.98 1539 24.34 1279<br />

5 DIAMETRAL PITCH CAST IRON 14 1 ⁄2° PRESSURE ANGLE 1-3/4" FACE REFERENCE PAGE 26.<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 />

24 1.13 2859 2.16 2723 3.95 2487 6.73 2120 8.79 1847 12.69 1333 14.88 1042<br />

25 1.20 3034 2.29 2885 4.17 2626 7.07 2227 9.20 1933 13.19 1385 15.41 1079<br />

30 1.49 3752 2.80 3534 5.03 3168 8.32 2623 10.66 2238 14.80 1554 17.00 1191<br />

35 1.80 4548 3.37 4246 5.95 3749 9.64 3038 12.15 2554 16.44 1727<br />

40 2.08 5242 3.85 4852 6.70 4224 10.65 3356 13.25 2783 17.53 1841<br />

45 2.36 5947 4.33 5459 7.44 4689 11.60 3657 14.27 2997 18.52 1945<br />

50 2.60 6543 4.73 5956 8.01 5051 12.29 3874 14.95 3142 19.08 2005<br />

55 2.90 7321 5.25 6612 8.79 5539 13.27 4182 15.99 3359 20.11 2112<br />

60 3.14 7910 5.62 7089 9.31 5870 13.86 4368 16.56 3478 20.55 2159<br />

70 3.65 9213 6.45 8135 10.46 6592 15.16 4779 17.84 3748<br />

80 4.17 10514 7.26 9153 11.54 7270 16.35 5152 18.99 3989<br />

100 5.03 12671 8.52 10745 13.08 8241 17.84 5620<br />

4 DIAMETRAL PITCH STEEL 14 1 ⁄2° PRESSURE ANGLE 2" FACE REFERENCE PAGE 27.<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 1.11 2810 2.17 2730 4.10 2584 7.41 2334 10.13 2128 16.01 1682 19.86 1391 22.57 1185 26.14 915<br />

12 1.21 3057 2.35 2963 4.43 2792 7.94 2502 10.79 2266 16.83 1768 20.69 1449 23.37 1228 26.85 940<br />

14 1.58 3971 3.04 3831 5.67 3577 10.02 3158 13.46 2827 20.48 2151 24.79 1736 27.70 1455<br />

15 1.75 4414 3.37 4247 6.26 3948 10.98 3461 14.67 3081 22.06 2318 26.52 1857 29.50 1550<br />

16 1.93 4876 3.71 4680 6.87 4332 11.97 3772 15.90 3339 23.66 2485 28.26 1979 31.30 1644<br />

18 2.30 5794 4.39 5535 8.06 5080 13.85 4364 18.20 3824 26.56 2790 31.35 2196<br />

20 2.66 6703 5.06 6373 9.21 5802 15.61 4920 20.33 4271 29.13 3060 34.04 2384<br />

22 3.01 7579 5.69 7173 10.28 6478 17.22 5427 22.23 4670 31.33 3291 36.29 2541<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: 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 />

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

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

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