Sleeve Coupling Spacer Hub Coupling Size 8 Maximum Speed 4 500 RPM Maximum Torque 1 475 in-lb Outside Diameter 3 1/4 in Bore Type Round Keyed Hub Diameter 3 1/4 in Hub Material Cast Iron For Bushing Size Not Applicable Bore Diameter 1 1/8 in Length through Bore 2 3/32 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