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 17 mm Fits Groove Diameter 17.8 mm Fits Groove Width 1.1 mm Free Outside Diameter 18.3 mm Clearance Diameter 8.8 mm Material Steel Finish Plain Material Grade/Class Ungraded Ring Type Housing Ring Clearance Diameter Type Compressed Material Quality Standards DIN 472 Pack Size Small Pack