Standard Bore Sizes for
Torque Transmission Pulleys | | Nominal Bore Size | Bore Tolerances | | 1/4" | .2505 / .2515 | | 5/16" | .313 / .314 | | 3/8" | .3755 / .3765 | | 1/2" | .5005 / .5015 | | 5/8" | .6255 / .6265 | | 3/4" | .7505 / .7515 |
Other bore sizes and metric bore sizes available upon request at an additional surcharge. |  | Standard Keyways and Setscrews
for Pulleys | | Bore | Keyway* | Setscrew | | 5/16" | 3/32" | 10-24 | | 3/8" | 1/8" | 10-24 | | 1/2" | 1/8" | 10-24 | | 5/8" | 3/16" | 10-24 | | 3/4" | 3/16" | 10-24 | | All 8mm Pulleys | 1/4-20 |
*Other keyways are available upon requestAll setscrews are knurled cup point. Please specify if another size or type of setscrew is required. Metric setscrews are also available. All setscrews are placed directly over the keyway. If two setscrews are ordered, the second setscrew is 90º clockwise from the first one, unless otherwise specified. |
