O-RING (Hyundai HNC00021)

A damaged retaining ring can allow assembled components to separate under load, leading to mechanical failure. This aftermarket replacement part references Hyundai as the OE maker and cross-references part number HNC00021. The retaining ring functions as a mechanical fastener that seats in a groove to secure a shaft or bore assembly. A common failure consequence is that a worn or missing ring permits axial movement, which can cause misalignment or disengagement of adjacent parts. In a typical usage context, these rings are installed during reassembly after bearing or seal replacement. Verify the serial number or application, then call (562) 693-7748. The part is an O-ring type retaining ring, not a standard O-ring seal.

Part number variants: HNC00021, hnc00021