Rigid Shaft Coupling Bore Diameter 1 1 3/8 in Bore Diameter 2 1 3/8 in Bore Type Round Clearance Diameter 2.5 in Coupling Construction One-Piece Coupling Material Carbon Steel Coupling Outside Diameter 2 1/2 in Different Bore Sizes No Keyway Depth 1 Not Applicable Keyway Depth 2 Not Applicable Minimum Bore Diameter 1 3/8 in Keyway Width 1 Not Applicable Keyway Width 2 Not Applicable Maximum Bore Diameter 1 3/8 in Maximum Speed 1 800 RPM Maximum Torque 1 375 in-lb