Rigid Shaft Coupling, Bore Diameter 1 1 1/4 in, Bore Diameter 2 1 in, Bore Type Round, Clearance Diameter 2.29 in, Coupling Construction One-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 5,000 in-lb 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. -