ASSY RING-PISTON (Hyundai HN1A9121090)

HN1A9121090: A worn retaining ring can allow a piston assembly to separate under load, leading to sudden mechanical failure. This aftermarket replacement part references Hyundai as the OE maker and cross-references part number HN1A9121090. The retaining ring functions as a mechanical fastener that secures the piston within its bore. A failed retaining ring may cause the piston to shift, resulting in loss of compression or internal damage. During operation, the ring must maintain its grip despite vibration and thermal cycling. The item ships at approximately 0.15 POUNDS. Verify the serial number or application, then call (562) 693-7748.

Part number variants: HN1A9121090, hn1a9121090