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3J6899 - SELF LOCKING NUT Fits Caterpillar (Fits CAT) !!!FREE SHIPPING! model-M8200SDTNC One New Aftermarket Replacement C80One New Aftermarket Replacement Self Locking Nut for Caterpillar (Cat) Construction Equipment This 2 1 4" 12 self locking hex nut is a heavy duty fastener used in hydraulic cylinder and steering cylinder applications on Caterpillar (Cat) construction equipment. The self locking design prevents loosening under vibration and load, making it a critical hardware component in demanding off road machine assemblies. Specifications Thread Size: 2 1 4" 12