Midwest Fastener #4 Internal Tooth Lock Washer

The Midwest Fastener #4 Internal Tooth Lock Washer is designed to prevent fasteners from loosening due to vibration, shock, or movement. Featuring internal teeth that grip both the fastener head and the mating surface, it provides a secure and reliable hold in a variety of hardware and fastening applications. Constructed from durable steel with a corrosion-resistant zinc finish, this internal tooth lock washer delivers dependable strength and lasting performance for mechanical, automotive, and household projects.