Your result

Locking Ability

1

Reusability

0

Worker safety

4

Initial cost

Low

Lifetime cost

High

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

How did we calculate?

Are split ring washers effective
against bolt loosening?

Split ring washers use friction to prevent bolted joints from loosening. They feature a ring that has been split and twisted - creating two sharp edges. These washers are installed between the bolt head/nut and mating surface, the bolted joint is then tightened in the same way as an unsecured bolt. When the nut is tightened, the washer flattens down, pushing the sharp edges into the mating surface.

Any locking ability works best on softer materials as it is easier for the edges to dig into them. It is ineffective at locking bolted joints experiencing higher levels of dynamic loads. It is also ineffective when the bolted joint requires lubrication, which promotes sliding and rotation of the bolt.

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 contact surfaces being damaged by the washer?

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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