Rigid Shaft Coupling, Bore Diameter 1 1 3/8 in, Bore Diameter 2 1 3/8 in, Bore Type Round Keyed, Clearance Diameter 2.77 in, Coupling Construction One-Piece, Coupling Material Carbon Steel, Coupling Outside Diameter 2 1/2 in, Different Bore Sizes No, Keyway Depth 1 5/32 in, Keyway Depth 2 5/32 in, Minimum Bore Diameter 1 3/8 in, Keyway Width 1 5/16 in, Keyway Width 2 5/16 in, Maximum Bore Diameter 1 3/8 in, Maximum Speed 4,000 RPM, Maximum Torque 9,600 in-lb, Overall Length 3 5/8 in This product contains a chemical that is regulated under California Proposition 65. Warning: This product contains a chemical known to the State of California to cause cancer. Warning: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm. -