Spiral Retaining Ring 0.035 in Thk PK25 System of Measurement Inch Location Style Internal Thickness 0.035 in Fits Shaft Diameter Not Applicable For Bore Diameter 1/2 in Fits Groove Diameter 0.461 in Fits Groove Width 0.029 in Fits Groove Depth 0.015 in Free Outside Diameter 0.538 in Material Steel Finish Plain Material Grade/Class Ungraded Tensile Strength 221 000 psi Ring Type Spiral Retaining Ring Material Quality Standards ANSI Pack Size Small Pack