Need to mount a standard freewheel on a 1/2" jackshaft? This is the part you're looking for.
This clear-anodized aluminum freewheel adapter accepts standard screw-on freewheels, for high-torque electric drives, we like the White Industries ENO 16T freewheels.
Thread size: 1.37 x 24 tpi
Bore: 1/2"
Weight: 45g
Includes two setscrews.