Retaining Ring,Internal,0.035 In. Thk,PK50, System of Measurement Not Applicable, Location Style Internal, Thickness 0.035 in, Fits Shaft Diameter Not Applicable, For Bore Diameter 1/2 in, Fits Groove Diameter 0.53 in, Fits Groove Width 0.039 in, Fits Groove Depth Not Applicable, Free Inside Diameter Not Applicable, Free Outside Diameter 0.548 in, Clearance Diameter 0.5 in, Material Steel, Finish Plain, Material Grade/Class Ungraded, Tensile Strength Not Applicable, Ring Type Retaining Ring