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 90 Outside Diameter 227.82 mm Pitch 8 mm Pitch Diameter 229.19 mm Bore Type Plain Face Width 65 mm Features Self-Tracking Design For Belt Trade Size P-90S Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 65 mm Material Fabrication Machined Material Grade 4140