Locknut

Locknut

A locknut (lock nut or locking nut) is a nut that is used to stop some other nut or similar component from working loose for example at a certain frequency of vibrations.

Two ordinary nuts

For example, where a nut would otherwise loosen over time due to vibration, a second similar nut (the locknut) can be tightened against the first; this arrangement will not loosen even if the object being held by the first nut vibrates or even rotates.

A thin nut is first tightened down and a normal nut is screwed down on top of it. The thin nut is then slackened back, thus wedging the nut threads against opposite flanks of the bolt threads. This jams the nut in place.

Locknuts are also used when some part of a machine spins as they can allow the transmission of rotational force (torque) to a threaded axle: in the context of power transmission, locknuts are used to securely fasten gears and bearings to shafts or spindles.

pecialised locknuts

There are various kinds of specialised lock nuts, including:
* Castellated nut
* Center lock nut
* Jam nut
* Keps nut (K-nut, washer nut)
* Oval lock nut (Cleveloc)
* Polymer insert nut (Nyloc)
* Serrated face nut
* Split beam nut (Aerotight "stiff nut")
* Toplock nut
* Serrated flange nut
* T-nut
* Well nut


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Look at other dictionaries:

  • locknut — locknut, lock nut lock nut . a supplementary nut that is screwed down on a primary nut to prevent it from loosening; a check nut. [WordNet 1.5] …   The Collaborative International Dictionary of English

  • locknut — [läk′nut΄] n. 1. a thin nut screwed down hard on an ordinary nut to prevent the latter from working loose 2. a specially designed nut that locks itself when screwed down tight: also lock nut * * * lock·nut also lock nut (lŏkʹnŭt ) n …   Universalium

  • locknut — [läk′nut΄] n. 1. a thin nut screwed down hard on an ordinary nut to prevent the latter from working loose 2. a specially designed nut that locks itself when screwed down tight: also lock nut …   English World dictionary

  • locknut — noun Date: circa 1864 1. a nut screwed down hard on another to prevent it from slacking back 2. a nut so constructed that it locks itself when screwed tight against another part …   New Collegiate Dictionary

  • locknut — noun A second nut, screwed down onto another in order to prevent it slipping …   Wiktionary

  • locknut — n. thin nut which is screwed up tightly on another nut in order to prevent it from getting loose …   English contemporary dictionary

  • locknut — noun 1》 a nut screwed down on another to keep it tight. 2》 a nut designed so that, once tightened, it cannot be accidentally loosened …   English new terms dictionary

  • locknut — /ˈlɒknʌt/ (say loknut) noun 1. a supplementary nut screwed down upon another to prevent it from shaking loose. 2. a nut in which spontaneous motion is prevented by springs fitting between the threads, or by interlocking parts …  

  • locknut — A nut used in conjunction with a washer or a second nut to lock a mechanism in place, such as the nut found at the upper end of a headset and in front of the calipers on many caliper brakes. Also see center lock nut nylon lock nut …   Dictionary of automotive terms

  • locknut — noun supplementary nut that is screwed down on a primary nut to prevent it from loosening • Syn: ↑safety nut • Hypernyms: ↑nut …   Useful english dictionary

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