Rigid Shaft Coupling Bore Diameter 1 1/2 in Bore Diameter 2 3/8 in Bore Type Round Clearance Diameter 1.33 in Coupling Construction One-Piece Coupling Material Stainless Steel Coupling Outside Diameter 1 1/8 in Different Bore Sizes Yes Keyway Depth 1 Not Applicable Keyway Depth 2 Not Applicable Minimum Bore Diameter 3/8 in Keyway Width 1 Not Applicable Keyway Width 2 Not Applicable Maximum Bore Diameter 1/2 in Maximum Speed 4 000 RPM Maximum Torque 275 in-lb