Caterpillar 5P-1979 O-Ring

The Caterpillar 5P-1979 O-Ring is a nitrile Buna-N seal (NBR) hardened to 75A, measuring 132.72 mm in inner diameter with a 5.33 mm cross-section, designed to deliver a precise, crush-resistant seal in CAT hydraulic interfaces and fluid-handling assemblies. Listed by Cat Parts Store as 5P-1979, this O-ring is intended for use in Caterpillar equipment where a compatible nitrile elastomer is specified for sealing mating surfaces in hydraulic systems, avoiding leaks under standard operating conditions and helping maintain system integrity. The verified specifications for this exact part include 132.72 mm ID, 5.33 mm cross-section, and NBR material at 75A hardness, with the Cat designation ensuring a precise replacement fit when servicing CAT machinery that requires this specific part number.