External Tooth Lock Washers M4 Serrated Locking Washers, Carbon Steel Heavy Duty Fasteners Pack Of 100 For Screws, Bolts, Mechanical Equipment, Black Finish, Secure Hold And Vibration Resistance

M4 External Tooth Lock Washers in Carbon Steel, 100-Pack
✔️ M4 external tooth washer, ID 4mm, OD 8mm, 0.5mm thick

These external tooth lock washers are a bulk 100-piece pack designed to secure fasteners in vibration-prone equipment. They’re widely used for electrical connections in household and commercial appliances, automobiles, ships, home decor, industrial materials, mechanical operations, and electronics.

✅ 100 pcs per pack
✅ M4 size; ID 4mm / 0.16in, OD 8mm / 0.31in, thickness 0.5mm / 0.02in
✅ Carbon steel with black zinc finish for corrosion resistance
✅ Serrated teeth distribute pressure and fight loosening
✅ Quick installation with standard bolts and nuts

💡 What is an external tooth lock washer used for in mechanical assemblies? These handy items prevent fastener loosening in vibrating equipment.

- enhances retention in vibration-heavy setups
- bites into surfaces to distribute load and resist creep
- compatible with standard bolts and nuts like M4
- adds corrosion resistance with black finish