Motion Control Coupling Hub, Angular Misalignment 0.5 Degrees , Axial Motion 0.1 mm, Coupling Size MOST13, Outside Diameter 12.7 mm, Over-Standard Parallel Misalignment 1.27 mm, Parallel Misalignment 0.1 mm, Coupling Overall Length 15.9 mm, Hub Material Aluminum, Length through Bore 5.6 mm, System of Measurement Metric, Bore Diameter 3 mm, Maximum Speed 4,500 RPM, Bore Type Round, Shaft Locking Type Set Screw, Keyway Depth Not Applicable, Keyway Width Not Applicable