Midwest Fastener #4 External Tooth Lock Washer

The Midwest Fastener #4 External Tooth Lock Washer provides dependable locking action to keep threaded fasteners secure under heavy vibration. Designed with teeth extending along the outer perimeter, this washer bites into the mating surface and fastener head to resist loosening, ensuring a tight and reliable hold. Constructed from durable steel with a protective zinc finish, this external tooth lock washer offers enhanced resistance to corrosion and wear. Ideal for electrical, mechanical, and general fastening projects, it delivers long-lasting stability and performance.