Rigid Shaft Coupling Bore Diameter 1 1 1/4 in Bore Diameter 2 1 in Bore Type Round Clearance Diameter 2.31 in Coupling Construction Two-Piece Coupling Material Carbon Steel Coupling Outside Diameter 2 1/16 in Different Bore Sizes Yes Keyway Depth 1 Not Applicable Keyway Depth 2 Not Applicable Minimum Bore Diameter 1 in Keyway Width 1 Not Applicable Keyway Width 2 Not Applicable Maximum Bore Diameter 1 1/4 in Maximum Speed 4 000 RPM Maximum Torque 2 470 in-lb