Your result

Locking Ability

3

Reusability

1

Worker safety

4

Initial cost

Medium

Lifetime cost

Medium

SCALE:    0 = Not Applicable.   1 = Unsuitable.   5 = Excellent.

How did we calculate?

Are serrated washers effective
against bolt loosening?

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.  

Read the full version in the eBook "Why do bolts loosen?"
(A comparison between common bolt securing options)
Scroll down to access the ebook.

Spend a lot of time checking your bolts and nuts are still tight?

The biggest challenge for a bolted joint, causing it to lose preload and fail, is spontaneous loosening. Vibrations are everywhere.


This video shows all 5 nuts rotated loose.
A steep decline in the graph indicates a failure.

This Junker test shows all 5 nuts rotate loose! 

(The Junker test is the most severe vibration test for bolted connections. The bolted joint is exposed to transverse movements underneath the bolt head or nut, while the clamping force is continuously measured.) 
The effectiveness of different locking methods can easily be compared.

 

 

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Which bolt locking product should I use?

See how different bolt locking products perform.

What you will find in the eBook:

  • Pros and cons of the different bolt locking methods
  • Evaluation of different products
  • A print-friendly Guidance for Selection, to help you decide which product to use in your applications

 

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