Retaining Ring Internal 2 mm Thk PK25 System of Measurement Metric Location Style Internal Thickness 2 mm Fits Shaft Diameter Not Applicable For Bore Diameter 52 mm Fits Groove Diameter 55 mm Fits Groove Width 2.15 mm Free Outside Diameter 56.2 mm Clearance Diameter 37.9 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