O-RING (CAT CT21306-61520)

CT21306-61520: A worn retaining ring can allow components to separate during operation, leading to sudden mechanical failure. This aftermarket replacement part references CAT as the OE maker and cross-references part number CT21306-61520. The retaining ring functions as a mechanical fastener that holds assembled parts in position within a groove. A common failure consequence is that a broken or missing ring permits axial movement, which can cause misalignment or detachment of connected elements. In a typical usage context, retaining rings are installed in grooves to secure bearings, shafts, or pins under load. The item ships at approximately 0.004 pounds. Verify the serial number or application, then call (562) 693-7748.

Part number variants: CT21306-61520, ct21306-61520, CT2130661520, ct2130661520