HTD Timing Belt Pulley Bore Diameter 1/2 in For Belt Series HTD For Belt Width 20 mm For Use With POWERHOUSE(TM) HTD(R) Belts Material Steel Maximum Bore Diameter Not Applicable Number of Teeth 22 Outside Diameter 2.559 in Pitch 8 mm Pitch Diameter 2.206 in Bore Type Plain Face Width 1.125 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Black Oxide For Belt Trade Size HTD Hub Diameter 1 5/8 in