Washer, 5/8 Int Lock 138557

The Genuine Navistar International 5/8 Inch Internal Tooth Lock Washer (138557) is a fastening component designed to prevent loosening of bolted joints under vibration. It provides secure locking by biting into the mating surfaces, maintaining tension and stability in assemblies. This washer is commonly used in heavy-duty truck and commercial vehicle applications requiring reliable locking solutions.