Spiral Retaining Ring 0.035 in Thk PK25 System of Measurement Inch Location Style External Thickness 0.035 in Fits Shaft Diameter 1/2 in For Bore Diameter Not Applicable Fits Groove Diameter 0.039 in Fits Groove Width 0.588 in Fits Groove Depth 0.019 in Free Inside Diameter 0.583 in Material Steel Finish Plain Material Grade/Class Ungraded Tensile Strength 221 000 psi Ring Type Spiral Retaining Ring Material Quality Standards ANSI Manufacturer Location Made in USA