#3 Internal Tooth Lock Washer, Stainless Steel 400 Series

Manufactured from 400‑series stainless steel, this #3 internal tooth lock washer is designed to help prevent loosening caused by vibration and movement. The internal teeth bite into the underside of the fastener head and the mating surface to provide reliable locking action while maintaining a low‑profile appearance. Suitable for automotive, electrical, and general‑purpose inch‑series applications where secure fastening and moderate corrosion resistance are required.