Gearbelt Pulley Bore Diameter 1/2 in For Belt Series SilentSync For Belt Width 16 mm For Use With SilentSync Yellow Belts Material Ductile Iron Number of Teeth 75 Outside Diameter 189.62 mm Pitch 8 mm Pitch Diameter 190.99 mm Bore Type Plain Face Width 17 mm Features Self-Tracking Design For Belt Trade Size Y-75S Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 16 mm Material Fabrication Machined Maximum Operating Temperature 200 Degrees F