External tooth lock washers: 5/16 in ID, 11/16 in OD
✔️ Heavy-duty zinc-plated steel, Grade 2/A307, 100-pack

These external tooth lock washers bite into the surface to lock fasteners in place, delivering reliable vibration resistance for home, farm, automotive, and DIY projects.

✅ Inner diameter: 5/16 in
✅ Outer diameter: 11/16 in
✅ Thickness: 1/16 in
✅ Material: Steel
✅ Finish: Zinc
✅ Hardness: Grade 2/A307
✅ Style: External Tooth
✅ Pack: 100

💡 What is an external tooth lock washer used for in DIY projects?

These handy washers help prevent fastener loosening in vibrating setups.

- Handy for automotive, machinery, and farm gear - Improves lock-up under vibration for bolted joints - Works with 5/16 in ID and 11/16 in OD hardware - Zinc-plated steel resists rust in workshops and outdoor setups