Tooth vs. Split Lock Washer
Two classic anti-loosening washers with different jobs: teeth bite and conduct, splits push back.
| Feature | Tooth Lock Washer | Split Lock Washer |
|---|---|---|
| How it works | Teeth bite into both faces | Helical split pushes apart |
| Electrical grounding | Good — cuts through coatings | Poor |
| Surface damage | Scars the part | Light marking |
| Vibration record | Marginal once tight | Marginal once tight |
| Best for | Grounding, appliances | General light locking |
Verdict
Neither is a real lock. Use tooth washers where you need electrical bonding, split washers for cheap insurance on light joints — and a lock nut for anything critical.