M4 Type J Internal Tooth Lock Washer, Stainless Steel A2 (18‑8)

Manufactured from A2 (18‑8) stainless steel, this M4 Type J internal tooth lock washer is designed to resist loosening caused by vibration and movement in metric assemblies. The internal teeth bite into the underside of the fastener head and mating surface, providing secure locking action while maintaining a low‑profile fit. Excellent corrosion resistance makes it ideal for precision, electronic, industrial, and general‑purpose metric applications requiring reliable fastening and durability.