Midwest Fastener 5/16 in. Internal Tooth Lock Washer

The Midwest Fastener 5/16 in. Internal Tooth Lock Washer is engineered to prevent nuts, bolts, and threaded fasteners from loosening when subjected to vibration and dynamic loads. Designed with inward-facing teeth, this lock washer bites securely into both the fastener head and mating surface to provide exceptional holding power in mechanical and assembly applications. Constructed from durable grade 2 steel with a corrosion-resistant zinc finish, this washer offers reliable strength and long-lasting service in automotive, industrial, and general hardware fastening projects.