#4 Phosphor Bronze External Tooth Lock Washer

Manufactured from phosphor bronze, this #4 external tooth lock washer provides dependable resistance to loosening caused by vibration and movement while offering excellent corrosion resistance. The external teeth bite into the fastener head and mating surface to deliver strong locking action and enhanced electrical conductivity. Ideal for electrical, marine, and general‑purpose applications where durability, conductivity, and corrosion resistance are required.