Retaining Ring Internal 2.5 mm Thk PK5 System of Measurement Metric Location Style Internal Thickness 2.5 mm Fits Shaft Diameter Not Applicable For Bore Diameter 78 mm Fits Groove Diameter 81 mm Fits Groove Width 2.65 mm Free Outside Diameter 82.5 mm Clearance Diameter 60.1 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