Reinforced E-Style Ring 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 0.242 in Free Outside Diameter 0.588 in Clearance Diameter 0.61 in Material Steel Finish Black Phosphate Material Grade/Class Not Graded Tensile Strength Not Applicable Ring Type Reinforced E-Style Ring