Your result

Locking Ability

3

Reusability

0

Worker safety

2

Initial cost

High

Lifetime cost

Medium

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

How did we calculate?

Are tab washers effective
against bolt loosening?


Tab washers are a mechanical locking solution that secure bolted joints using a physical barrier. The washer itself is a thin piece of metal usually rectangular or circular. The tab washer is installed between the bolt head/nut and the mating surface, and the bolted joint is tightened like a regular bolt. Once the bolt has been tightened, the tab section of the washer is knocked up around the bolt head/nut to lock it in place and prevent any rotation.

The locking function of the washer is normally good, however, numerous cases of badly installed, thus inefficient, tab washers have been reported by large MROs and asset owners. The major disadvantage is the complex assembly method. 

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

Ever experienced hand injuries working with tab washers?

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 rotated 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.

Talk about bolting challenges with us!

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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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