Retaining Ring Internal 1 mm Thk PK50 System of Measurement Metric Location Style Internal Thickness 1 mm Fits Shaft Diameter Not Applicable For Bore Diameter 18 mm Fits Groove Diameter 19 mm Fits Groove Width 1.1 mm Fits Groove Depth 0.5 mm Free Outside Diameter 19.5 mm Material Steel Finish Black Phosphate Material Grade/Class Ungraded Tensile Strength 150 000 psi Ring Type Housing Ring Material Quality Standards DIN 472 Manufacturer Location Made in USA