Your result

Locking Ability

2,5

Reusability

1

Worker safety

4

Initial cost

Medium

Lifetime cost

Medium

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

How did we calculate?

Are nylon insert lock nuts effective
against bolt loosening?

Locking nuts work to secure bolted joints by adding friction to the thread of the bolt. Different varieties of locking nut exist, those that utilize metal to create friction, such as the all metal nut, and those that incorporate a polymer in the design, such as the nylon insert nut. Locking nuts follow the same installation procedure as normal nuts. The nylon insert nut features an internal nylon washer or patch.

The addition of the non-metal component means that the nylon insert nut is more temperature and chemical sensitive. It also necessitates the use of a tool for installation, however, the revolution speed must be less than 150 RPM in order to avoid over heating the nylon insert.

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

Are you aware of the limitations of extreme temperatures?

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.

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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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