Gearbelt Pulley Bore Diameter 1/2 in For Belt Series SilentSync For Belt Width 64 mm For Use With SilentSync Purple Belts Material Ductile Iron Number of Teeth 80 Outside Diameter 202.35 mm Pitch 8 mm Pitch Diameter 203.72 mm Bore Type Plain Face Width 65 mm Features Self-Tracking Design For Belt Trade Size P-80S Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 64 mm Material Fabrication Machined Maximum Operating Temperature 200 Degrees F