Heavy Duty External Ring System of Measurement Inch Location Style External Thickness 0.05 in Fits Shaft Diameter 1/2 in For Bore Diameter Not Applicable Fits Groove Diameter 0.468 in Fits Groove Width 0.056 in Fits Groove Depth 0.016 in Free Inside Diameter 0.46 in Clearance Diameter 0.72 in Material Steel Material Grade/Class Not Graded Tensile Strength Not Applicable Ring Type External Heavy Duty Ring Thickness Tolerance +/-0.002 in Groove Width Tolerance +/-0.004/0.000 In.