Rigid Shaft Coupling Bore Diameter 1 7/8 in Bore Diameter 2 5/8 in Bore Type Round Clearance Diameter 1.94 in Coupling Construction Two-Piece Coupling Material Carbon Steel Coupling Outside Diameter 1 5/8 in Different Bore Sizes Yes Keyway Depth 1 Not Applicable Keyway Depth 2 Not Applicable Minimum Bore Diameter 5/8 in Keyway Width 1 Not Applicable Keyway Width 2 Not Applicable Maximum Bore Diameter 7/8 in Maximum Speed 4 000 RPM Maximum Torque 1 540 in-lb