Rigid Shaft Coupling Bore Diameter 1 1/4 in Bore Diameter 2 1/4 in Bore Type Round Clearance Diameter 0.74 in Coupling Construction One-Piece Coupling Material Carbon Steel Coupling Outside Diameter 11/16 in Different Bore Sizes No Keyway Depth 1 Not Applicable Keyway Depth 2 Not Applicable Minimum Bore Diameter Not Applicable Keyway Width 1 Not Applicable Keyway Width 2 Not Applicable Maximum Bore Diameter Not Applicable Maximum Speed 4 000 RPM Maximum Torque 25 in-lb