E Style Retaining Ring 0.025 in Thk PK100 System of Measurement Inch Location Style External Thickness 0.025 in Fits Shaft Diameter 1/4 in For Bore Diameter Not Applicable Fits Groove Diameter 0.21 in Fits Groove Width 0.047 in Fits Groove Depth 0.02 in Free Inside Diameter 0.207 in Free Outside Diameter 0.527 in Clearance Diameter 0.54 in Material Steel Finish Black Phosphate Material Grade/Class Ungraded Tensile Strength 120 000 psi Ring Type E-Style Retaining Ring