Sleeve Coupling Spacer Hub Coupling Size 6 Maximum Speed 6 000 RPM Maximum Torque 585 in-lb Outside Diameter 2 1/2 in Bore Type Round Hub Diameter 2 1/2 in Hub Material Cast Iron For Bushing Size Not Applicable Bore Diameter 5/8 in Length through Bore 1 7/32 in System of Measurement Inch Hub Body Length Not Applicable Hub Type Spacer Hub Application Compressors Conveyors Motors Pumps Bore Tolerance +0.0005 in / +0.0015 in