Sleeve Coupling Flange Coupling Size 6 Maximum Speed 6 000 RPM Maximum Torque 585 in-lb Outside Diameter 4 in Bore Type Round Keyed Hub Diameter 2 1/2 in Hub Material Cast Iron For Bushing Size Not Applicable Bore Diameter 1 3/8 in Length through Bore 1 5/16 in System of Measurement Inch Hub Body Length 9/16 in Hub Type Flange Hub Application Compressors Conveyors Motors Pumps Bore Tolerance +0.0005 in / +0.0015 in