Description:Cat retaining rings are installed into machined grooves in housings/bores (internal) or on shafts (external) and are engineered for strength and longevity in a variety of applications.Attributes: • Material: Steel• Type: External Axial• Free Diameter: 52 mm (2.047 in)• Retaining rings meet or exceed, ANSI, ASTM and DIN requirements• Emissions controlApplication: Consult your owner's manual or contact your local Cat Dealer for more Information.