Sleeve Coupling Spacer Hub Coupling Size 11 Maximum Speed 3 600 RPM Maximum Torque 18 000 in-lb Outside Diameter 5 1/4 in Bore Type Round Keyed Hub Diameter 5 1/4 in Hub Material Cast Iron For Bushing Size Not Applicable Bore Diameter 2 7/8 in Length through Bore 2 23/32 in System of Measurement Inch Hub Body Length Not Applicable Hub Type Spacer Hub Application Compressors Conveyors Motors Pumps Bore Tolerance +0.0005 in / +0.0020 in