| Minimum Recommended Sheave Outside Diameter for General Purpose Electric Motors | |||||
| Motor | Motor RPM | ||||
| HP | 695 | 870 | 1160 | 1750 | 3450 |
| 1/2 | 2.5 | 2.2 | |||
| 3/4 | 2.5 | 2.4 | 2.2 | ||
| 1 | 2.5 | 2.4 | 2.4 | 2.2 | |
| 1 1/2 | 3.0 | 2.4 | 2.4 | 2.4 | 2.2 |
| 2 | 3.0 | 3.0 | 2.4 | 2.4 | 2.4 |
| 3 | 3.8 | 3.0 | 3.0 | 2.4 | 2.4 |
| 5 | 4.5 | 3.8 | 3.0 | 3.0 | 2.4 |
| 7 1/2 | 4.5 | 4.5 | 3.8 | 3.0 | 3.0 |
| 10 | 5.2 | 4.4 | 4.4 | 3.8 | 3.0 |
| 15 | 6.0 | 5.2 | 4.4 | 4.4 | 3.8 |
| 20 | 6.8 | 6.0 | 5.2 | 4.4 | 4.4 |
| 25 | 8.2 | 6.8 | 6.0 | 4.4 | 4.4 |
| 30 | 9.0 | 6.8 | 6.8 | 5.2 | |
| 40 | 10.0 | 8.2 | 6.8 | 6.0 | |
| 50 | 10.0 | 8.4 | 8.2 | 6.8 | |
| 60 | 11.0 | 10.0 | 8.2 | 7.4 | |
| 75 | 13.0 | 10.0 | 10.0 | 8.6 | |
| 100 | 15.0 | 12.0 | 10.0 | 8.6 | |
| 125 | 18.0 | 15.0 | 12.0 | 10.5 | |
| 150 | 20.0 | 18.0 | 13.0 | 10.5 | |
| 200 | 22.0 | 22.0 | 13.2 | ||
| 250 | 22.0 | ||||
| 300 | 27.0 | Diameters are in inches. | |||
| Data above is from NEMA Standard MG-1-14.42 & MG-1-14.43 and a composite of data from electric motor manufacturers where the NEMA standards above do not address. Please note that for a given motor horsepower, the total belt pull is dependent on the sheave diameter. The smaller the sheave diameter the greater the belt pull and resultant bearing load. For any special duty Electric Motors please contact the manufacturer of the motor. | |||||