Crescent Retaining Ring 0.035 in Thk PK100 System of Measurement Inch Location Style External Thickness 0.035 in Fits Shaft Diameter 1/2 in For Bore Diameter Not Applicable Fits Groove Diameter 0.45 in Fits Groove Width 0.039 in Fits Groove Depth 0.025 in Free Inside Diameter 0.441 in Free Outside Diameter 0.581 in Clearance Diameter 0.6 in Material Steel Finish Zinc Plated Material Grade/Class Ungraded Tensile Strength 120 000 psi Ring Type Crescent Retaining Ring