Gearbelt Pulley Bore Diameter 1 in For Belt Series SilentSync For Belt Width 70 mm For Use With SilentSync Orange Belts Material Cast Iron Number of Teeth 90 Outside Diameter 398.29 mm Pitch 14 mm Pitch Diameter 401.08 mm Bore Type Plain Face Width 72 mm Features Self-Tracking Design For Belt Trade Size O-90S Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 72 mm Material Fabrication Machined Maximum Operating Temperature 200 Degrees F