Keyless Bushing Flange Type Flanged For Bore Diameter 1 5/16 in Keyless Bushing Type Multi-Screw Locking Assembly Material Steel Outside Diameter 2 3/8 in Overall Width 1.969 in System of Measurement Inch Finish Zinc Plated Hub Contact Pressure 6 535 psi Maximum Transmitted Torque 598 ft-lb Outside Diameter Tolerance +/-0.003