3/8" External Tooth Lock Washer, Stainless Steel 400 Series

Manufactured from 400‑series stainless steel, this 3/8" external tooth lock washer is designed to resist loosening caused by vibration and movement. The external teeth bite into the fastener head and mating surface to deliver strong locking action and improved electrical grounding. Suitable for automotive, electrical, and general‑purpose inch‑series applications where reliable locking performance and moderate corrosion resistance are required.