Keyless Bushing Flange Type Not Applicable For Bore Diameter 1/4 in Keyless Bushing Type Single Nut Locking Assembly Material Steel Outside Diameter 5/8 in Overall Width 0.75 in System of Measurement Inch Finish Oil Dipped Hub Contact Pressure 11 316 psi Maximum Transmitted Torque 125 ft-lb Outside Diameter Tolerance +/-0.0015