Rigid Shaft Coupling Bore Diameter 1 1 1/4 in Bore Diameter 2 1 1/4 in Bore Type Round Clearance Diameter 2.25 in Coupling Construction One-Piece Coupling Material Carbon Steel Coupling Outside Diameter 2 1/4 in Different Bore Sizes No Keyway Depth 1 Not Applicable Keyway Depth 2 Not Applicable Minimum Bore Diameter 1 1/4 in Keyway Width 1 Not Applicable Keyway Width 2 Not Applicable Maximum Bore Diameter 1 1/4 in Maximum Speed 3 500 RPM Maximum Torque 1 250 in-lb