Keyless Bushing Flange Type Flanged For Bore Diameter 30 mm Keyless Bushing Type Multi-Screw Locking Assembly Material Steel Outside Diameter 51 mm Overall Width 37.4 mm System of Measurement Metric Finish Zinc Plated Hub Contact Pressure 8 674 psi Maximum Transmitted Torque 4 850 ft-lb Outside Diameter Tolerance +/-0.003