E Style Retaining Ring 0.025 in Thk PK100 System of Measurement Inch Location Style External Thickness 0.025 in Fits Shaft Diameter 5/16 in For Bore Diameter Not Applicable Fits Groove Diameter 0.25 in Fits Groove Width 0.029 in Fits Groove Depth 0.031 in Free Inside Diameter 0.243 in Free Outside Diameter 0.5 in Clearance Diameter 0.5 in Material Steel Finish Zinc Plated Material Grade/Class Ungraded Tensile Strength 120 000 psi Ring Type E-Style Retaining Ring