Ten Thousand Size Four Internal External Tooth Lock Washers Made From Premium Zinc Plated Steel To Lock Down Your Hardware And Keep The Wobble Out While Providing Big Time Electrical Grounding For Any Shop Or Handyman Project On The Back Forty

Size #4 Internal External Tooth Lock Washers Zinc Steel
✔️ Bulk Lot Of 10000 Size #4 Internal External Tooth Lock Washers

This substantial pack of size four internal external tooth lock washers secures fasteners against shaking and keeps hardware tight during heavy garage builds or outdoor job sites. The sharp serrated edges dig into softer mounting plates to stop bolts from slipping backward while creating a direct metal-to-metal contact path for reliable chassis electrical grounding.

✅ Inch measurement system for precise bolt sizing compatibility
✅ Clear zinc plated finish resists surface rust and corrosion
✅ Rockwell C40 to C50 hardness rating holds torque under stress
✅ Internal and external serrated design grips nuts and surfaces

💡 What makes internal external tooth lock washers ideal for electrical grounding and anti-vibration?

These serrated flange rings deliver a mechanical bite and direct copper contact that standard flat washers completely lack. - Twisted edges drive firmly into aluminum housings to kill fretting corrosion and quit bolt backing off permanently
- Outer teeth press straight against frame metal to bridge gap resistance for reliable signal grounding on equipment
- Spring temper steel maintains constant preload even when motor heat expands surrounding tube structures daily
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