Practically every engineering product with any degree of complexity uses threaded fasteners. A key advantage of threaded fasteners over the majority of other joining methods is that they can be dis-assembled and re-used. This feature is often the reason why threaded fasteners are used in preference to other joining methods and they often play a vital role in maintaining a product's structural integrity. However, they are also a significant source of problems in machinery and other assemblies. The reasons for such problems are due, in part, to them unintentionally self-loosening.

Fasteners coming loose is a common problem across many industries. We can complete an assessment of a fastener’s self loosening characteristics using a transverse vibration test machine (often referred to as a Junker machine and the the test performed, a Junker Vibration Test). The fastener preload decay graphs produced can allow an assessment to be made of a fastener’s resistance to self-loosening. The test can be performed on the locking mechanism forming part of a nut (such as with nylon insert nuts), on a bolt (such as bolts with a nylon coated patch on the bolt) or a washer (such as a helical spring lock washer).

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