Internal Medium Duty Spiral Ring System of Measurement Inch Location Style Internal Thickness 0.025 in Fits Shaft Diameter Not Applicable For Bore Diameter 1/2 in Fits Groove Diameter 0.526 in Fits Groove Width 0.03 in Fits Groove Depth 0.013 in Free Inside Diameter Not Applicable Free Outside Diameter 0.532 in Clearance Diameter Not Applicable Material Stainless Steel Material Grade/Class 18-8 Tensile Strength Not Applicable Ring Type Internal Med Duty Spiral Ring