Sleeve Coupling Spacer Flange Coupling Size 6 Maximum Speed 6 000 RPM Maximum Torque 585 in-lb Outside Diameter 4 in Bore Type Not Applicable Hub Diameter 2 1/2 in Hub Material Cast Iron For Bushing Size Not Applicable Bore Diameter Not Applicable Length through Bore 2 3/8 in System of Measurement Inch Hub Body Length 1 11/32 in Application Compressors Conveyors Motors Pumps Bore Tolerance Not Applicable