Gearbelt Pulley Bore Diameter 1/2 in For Belt Series SilentSync For Belt Width 64 mm For Use With SilentSync Purple Belts Material Steel Number of Teeth 64 Outside Diameter 161.61 mm Pitch 8 mm Pitch Diameter 162.98 mm Bore Type Plain Face Width 65 mm Features Self-Tracking Design For Belt Trade Size P-64S Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 65 mm Material Fabrication Machined Maximum Operating Temperature 200 Degrees F