Heavy Duty Retaining Ring 0.05 in Thk PK10 System of Measurement Inch Location Style External Thickness 0.05 in Fits Shaft Diameter 1/2 in For Bore Diameter Not Applicable Fits Groove Diameter 0.468 in Fits Groove Width 0.056 in Fits Groove Depth 0.016 in Free Inside Diameter 0.46 in Clearance Diameter 0.75 in Material Steel Finish Black Phosphate Material Grade/Class Ungraded Tensile Strength 150 000 psi Ring Type External Retaining Ring Clearance Diameter Type Expanded