Nyloc nut

Nylon Insert Lock Nut

A nyloc nut, also referred to as a nylon insert lock nut, polymer insert lock nut or elastic stop nut (see locking nuts), is a kind of nut that includes a nylon collar insert. These nuts are also referred to as "nylok" or "nylock".

The plastic insert is placed at the end of the nut and its inner diameter (ID) is slightly smaller than the major diameter of the screw. The insert deforms elastically over the threads of the screw, but threads are not cut into the nylon. The nylon insert locks the nut by applying a compressive force against the screw. Nyloc nuts retain their locking ability up to 250 °F (121 °C).^[1]

Trademark

"Nyloc" is a registered trade name of Forest Fasteners.^[2] In Australia "Nyloc" is a registered trade mark of Exafast Pty Ltd. There is also a "Nylok" trademark for a similar product (a Marmon/Berkshire Hathaway Company).

Related Fasteners

A nylon pellet nut is very similar to a nyloc nut except that it uses one or more smaller nylon inserts instead of a ring of nylon. They do not lock as strongly as nyloc nuts.^[1]

The nylock method of locking threads can also by applied to male fasteners (bolts). A small patch of nylon is added to the threaded shaft, and it has a similar effect.

Reuse safety

Authorities disagree on whether nyloc nuts should be reused. For example, Carroll Smith (Carroll Smith's Nuts, Bolts, Fasteners, and Plumbing Handbook) notes that the nylon insert is not damaged by installation and therefore they can be reused many times,^[1] and a Federal Aviation Administration Advisory Circular allows nuts to be reused if the prevailing torque is within specification.^[3] However, an Air Force Technical Order requires replacement of self-locking nuts in critical areas.^[4] Various specifications for aerospace-grade self-locking nuts require that the running torque be maintained after a number of cycles of assembly, but without preloading the fastener.^[5]

References

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