Motion Control Coupling Hub, Angular Misalignment 0.5 Degrees , Axial Motion 0.004 in, Coupling Size OST16, Outside Diameter 1 in, Over-Standard Parallel Misalignment 0.1 in, Parallel Misalignment 0.008 in, Coupling Overall Length 1.125 in, Hub Material Aluminum, Length through Bore 0.39 in, System of Measurement Inch, Bore Diameter 1/4 in, Maximum Speed 4,500 RPM, Bore Type Round, Shaft Locking Type Set Screw, Keyway Depth Not Applicable, Keyway Width Not Applicable 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. -