Your result

Locking ability

1 out of 5


Not Applicable

Worker safety

4 out of 5

Initial cost


Lifetime cost


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)
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Which bolt locking product should I use?

  • Pros & Cons of different bolt locking methods
  • A Guidance for Selection, to help you decide which product to use in your applications

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The biggest challenge for a bolted joint, causing it to lose preload and fail, is spontaneous loosening often caused by vibrationsThis Junker test shows all 5 nuts rotated loose! A steep decline in the graph indicates a failure. Read more about the Junker Test.

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