Crescent Retaining Ring 0.042 in Thk PK50 System of Measurement Inch Location Style External Thickness 0.042 in Fits Shaft Diameter 3/4 in For Bore Diameter Not Applicable Fits Groove Diameter 0.676 in Fits Groove Width 0.046 in Fits Groove Depth 0.037 in Free Inside Diameter 0.665 in Free Outside Diameter 0.845 in Clearance Diameter 0.87 in Material Steel Finish Zinc Plated Material Grade/Class Ungraded Tensile Strength 150 000 psi Ring Type Crescent Retaining Ring