Retaining Ring External 4 mm Thk PK2 System of Measurement Metric Location Style External Thickness 4 mm Fits Shaft Diameter 125 mm For Bore Diameter Not Applicable Fits Groove Diameter 121 mm Fits Groove Width 4.15 mm Free Inside Diameter 118 mm Clearance Diameter 149 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