Retaining Ring External 1.75 mm Thk PK25 System of Measurement Metric Location Style External Thickness 1.75 mm Fits Shaft Diameter 40 mm For Bore Diameter Not Applicable Fits Groove Diameter 37.5 mm Fits Groove Width 1.85 mm Free Inside Diameter 36.5 mm Clearance Diameter 52.6 mm Material Steel Finish Plain Material Grade/Class Ungraded Ring Type External Retaining Ring Clearance Diameter Type Expanded Material Quality Standards DIN 471 Pack Size Small Pack