E Style Retaining Ring 0.042 in Thk PK100 System of Measurement Inch Location Style External Thickness 0.042 in Fits Shaft Diameter 1/2 in For Bore Diameter Not Applicable Fits Groove Diameter 0.303 in Fits Groove Width 0.06 in Fits Groove Depth 0.036 in Free Inside Diameter 0.392 in Free Outside Diameter 0.8 in Clearance Diameter 0.82 in Material Steel Finish Black Phosphate Material Grade/Class Ungraded Tensile Strength 150 000 psi Ring Type E-Style Retaining Ring