Gearbelt Pulley Bore Diameter 1 in For Belt Series SilentSync For Belt Width 70 mm For Use With SilentSync Orange Belts Material Steel Number of Teeth 43 Outside Diameter 188.83 mm Pitch 14 mm Pitch Diameter 191.63 mm Bore Type Plain Face Width 72 mm Features Self-Tracking Design For Belt Trade Size O-43S Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 72 mm Material Fabrication Machined Maximum Operating Temperature 200 Degrees F