Retaining Ring External 0.012 in Thk PK25 System of Measurement Inch Location Style External Thickness 0.012 in Fits Shaft Diameter 3/16 in For Bore Diameter 3/16 in Fits Groove Diameter Not Applicable Fits Groove Width Not Applicable Fits Groove Depth 0.25 in Free Inside Diameter 0.188 in Free Outside Diameter 0.656 in Clearance Diameter Not Applicable Material Steel Finish Zinc Plated Material Grade/Class SAE 1050 Tensile Strength Not Applicable