Internal Light Duty Spiral Ring System of Measurement Inch Location Style Internal Thickness 0.018 in Fits Shaft Diameter Not Applicable For Bore Diameter 1/2 in Fits Groove Diameter 0.528 in Fits Groove Width 0.022 in Fits Groove Depth 0.014 in Free Inside Diameter Not Applicable Free Outside Diameter 0.531 in Clearance Diameter Not Applicable Material Steel Finish Plain Material Grade/Class Not Graded Tensile Strength Not Applicable Ring Type Internal Light Duty Spiral Ring