Shakeproof Lock Washers

Our shakeproof lock washers in A2 stainless steel are designed to prevent fasteners from loosening under vibration, movement, or dynamic loads. Available in both DIN 6798-A (external tooth) and DIN 6798-J (internal tooth) forms, these washers provide a secure, mechanical locking action by biting into the mating surface.

Commonly used with machine screws, bolts and threaded components, shakeproof washers are a simple and effective solution where reliability is critical. If you need enhanced corrosion resistance for marine or aggressive environments, A4 stainless steel options are available on request - just contact us via our live chat.

What Shakeproof Washers are Used for

Shakeproof washers are used to stop nuts and bolts from loosening due to vibration, rotation or thermal movement. The serrated teeth dig into the surface material and the underside of the fastener, creating friction and a locking effect.

Typical applications include:

  • Electrical assemblies and panels
  • Sheet metal fabrication
  • Automotive and mechanical equipment
  • HVAC systems and ductwork
  • General engineering and maintenance

Our standard stock is supplied in A2 stainless steel, offering good corrosion resistance for indoor and outdoor use. Where higher resistance is needed - such as marine or chemical environments - A4 stainless steel may be more suitable and can be sourced on request.

External tooth washers (DIN 6798-A) are often preferred where maximum grip is needed, while internal tooth washers (DIN 6798-J) are used where a neater finish or smaller outer diameter is required.

Standards and materials

This range includes washers manufactured to the following standards:

  • DIN 6798-A - External tooth shakeproof washers
  • DIN 6798-J - Internal tooth shakeproof washers

Both types are designed to work with metric fasteners and are widely used across UK and European applications.

How to choose the right shakeproof washer

Selecting the correct lock washer depends on the application and the fastener you are using.

  • Size - Match the washer to the bolt or screw diameter (for example, M6, M8, M10)
  • Type - Choose external tooth (DIN 6798-A) for maximum bite, or internal tooth (DIN 6798-J) where space or appearance matters
  • Material - A2 stainless steel suits most environments; consider A4 for harsher conditions
  • Surface material - Softer materials allow better tooth penetration and improved locking performance

In high-vibration or critical applications, shakeproof washers are often used alongside other locking methods depending on the level of security required.

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If you are unsure which shakeproof washer you need, or require A4 stainless steel variants, contact our human team via live chat for quick, practical advice.