Your result

Locking Ability




Worker safety


Initial cost


Lifetime cost


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

How did we calculate?

Are locking wires effective
against bolt loosening?

Locking wire, also known as safety wire, is a mechanical locking method. It is imperative that the wire is installed so that tension in the wire only allows the bolt head/nut to turn in the direction of tightening. The tension of each section of the wire must also be locked in place so as not to be affected by the accidental loosening of another bolt head/nut in the series. 

Although this method provides reasonable loosening resistance, it is time-consuming to assemble and the bolt head/nut must be drilled to create the holes for the locking wire - increasing the cost again. The only way to remove the locking wire is to cut it away – meaning that it cannot be reused and a new piece must be installed every time the bolted joint is maintained.

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

Do you waste valuable time installing locking wire?

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 locking wire rotated loose.
A steep decline in the graph indicates a failure.

This Junker test shows all 5 locking wires 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.



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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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