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 56 Outside Diameter 141.24 mm Pitch 8 mm Pitch Diameter 142.61 mm Bore Type Plain Face Width 65 mm Features Self-Tracking Design For Belt Trade Size P-56S Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 65 mm Material Fabrication Machined Material Grade 4140