Spiral Retaining Ring 0.025 in Thk PK25 System of Measurement Inch Location Style Internal Thickness 0.025 in Fits Shaft Diameter Not Applicable For Bore Diameter 3/8 in Fits Groove Diameter 0.397 in Fits Groove Width 0.029 in Fits Groove Depth 0.011 in Free Outside Diameter 0.4 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