Inverted External Ring System of Measurement Inch Location Style External Thickness 0.035 in Fits Shaft Diameter 5/8 in For Bore Diameter Not Applicable Fits Groove Diameter 0.588 in Fits Groove Width 0.039 in Fits Groove Depth 0.018 in Free Inside Diameter 0.579 in Clearance Diameter 0.8 in Material Steel Finish Black Phosphate Material Grade/Class Not Graded Tensile Strength Not Applicable Ring Type External Inverted Ring Thickness Tolerance +/-0.002 in