Retaining Ring External 1.2 mm Thk PK50 System of Measurement Metric Location Style External Thickness 1.2 mm Fits Shaft Diameter 20 mm For Bore Diameter 18.5 mm Fits Groove Diameter 19 mm Fits Groove Width 1.3 mm Fits Groove Depth 0.5 mm Free Inside Diameter 18.5 mm Material Steel Finish Black Phosphate Material Grade/Class Ungraded Tensile Strength 150 000 psi Ring Type External Retaining Ring Material Quality Standards DIN 471 Manufacturer Location Made in USA