Midwest Fastener 1/4 in. Internal Tooth Lock Washer

The Midwest Fastener 1/4 in. Internal Tooth Lock Washer is designed to prevent nuts, bolts, and screws from loosening under vibration and dynamic load. Featuring inward-facing teeth that bite into both the fastener head and mating surface, this lock washer provides a reliable, slip-resistant grip for heavy-duty fastening applications. Constructed from Grade 2 steel with a protective zinc finish, this washer delivers dependable strength and corrosion resistance. It is well-suited for electrical grounding, automotive assemblies, and general hardware fastening projects.