How Effective Is Serrated Washer?

The serrated washer is a type of friction-based bolt locking method.

Serrated lock washers increase the friction between the bolt head/nut and the mating surface. They do this by gripping into the mating surfaces. Serrated lock washers are installed between the bolt head/nut and the mating surface. The bolted joint is then tightened in the same way as an unsecured bolt. If the bolted joint experiences a loss of tension, the washer is no longer effective and must be replaced.

Single part serrated washers can damage painted/coated surfaces because they have a tendency to rotate with the fastener. This risks damaging the surface, cracking the paint/coating and causing corrosion.

This principle works best on softer materials, as it is easier for the serrations to dig into them.

Serrated Washers vs Wedge-Locking Washers

How do serrated washers compare to wedge-locking washers? Find out in the video below.

Which bolt locking product should I use?

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  • Pros and cons of the different bolt locking methods
  • Evaluation of different products
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