Gearbelt Pulley Bore Diameter 1/2 in For Belt Series SilentSync For Belt Width 16 mm For Use With SilentSync Yellow Belts Material Steel Number of Teeth 28 Outside Diameter 69.93 mm Pitch 8 mm Pitch Diameter 71.3 mm Bore Type Plain Face Width 17 mm Features Self-Tracking Design For Belt Trade Size Y-28S Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 16 mm Material Fabrication Machined Maximum Operating Temperature 200 Degrees F