M3 External tooth lock washers (DIN 6798 A)

Serrated lock washers with outward-facing teeth for secure, vibration resistant fastening and electrical grounding in machinery, automotive and electronics assemblies.

Key Benefits & Features

• Serrated outer teeth resist loosening: The outward facing teeth bite into the bearing surface, anchoring the fastener and resisting rotation due to vibration.
• Stronger hold than internal styles: External tooth washers provide a more aggressive grip than internal tooth washers, offering better protection from vibration and superior torsional resistance.
• Shock and vibration damping: Flexed teeth absorb shock and vibration, maintaining tension and preventing slippage or loosening.
• Electrical grounding capability: Serrated edges cut through protective coatings (e.g., zinc oxide) to provide a conductive path for grounding.
• Durable materials: Typically manufactured from hardened spring steel or stainless steel to withstand dynamic loads.
• Wide size range: Supplied in various diameters and thicknesses to match metric or imperial fasteners.
• Easy to install: Simply place the washer under the bolt or nut; the external teeth engage when tightened to secure the assembly.

Use Cases

• Automotive and electrical assemblies where vibration and electrical grounding are critical
• Machinery, pumps and engines subject to dynamic loads
• Electronics enclosures and circuit boards requiring reliable grounding
• Securing fasteners in soft materials like aluminium, plastic or wood where extra grip is needed
• High torque applications in industrial equipment and construction

Compatibility / Fittings

• Match washer size to the nominal diameter of your bolt or screw (e.g., M8 washer with M8 bolt).
• Suitable for use under larger bolt heads or nuts; can be combined with a flat washer for additional load distribution.
• Compatible with metric and imperial fasteners in mechanical, electrical and automotive assemblies.

Installation & Tips

• Place the washer between the fastener head (or nut) and the mating surface with the teeth facing the surface.
• Use the correct size to ensure the teeth engage properly and distribute load evenly.
• Tighten the fastener to recommended torque to allow the teeth to bite into the material and create a secure mechanical lock.
• For grounding applications, ensure the surface is conductive so the teeth can pierce coatings and establish an electrical connection.
• Avoid reusing lock washers, as the teeth may lose their gripping effectiveness after removal.