Jam nut

Jam nut

A jam nut is a type of locking nut that avoids compression of the part being fastened. It is commonly used to fasten parts that must be able to spin freely, such as bearings. It looks like a thin hex nut, but half as tall. It is threaded inside of and tightened against a full-thickness nut. This puts opposing tension on a localized segment of the screw thread, preventing either loosening or tightening of the pair.


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  • Jam nut — Jam Jam, n. [Prob. fr. jam, v.; but cf. also Ar. jamad ice, jelly, j[=a]mid congealed, jamd congelation, ice.] A preserve of fruit boiled with sugar and water; also called {jelly}; as, raspberry jam; currant jam; grape jam. [1913 Webster] {Jam… …   The Collaborative International Dictionary of English

  • Jam nut — Nut Nut (n[u^]t), n. [OE. nute, note, AS. hnutu; akin to D. noot, G. nuss, OHG. nuz, Icel. hnot, Sw. n[ o]t, Dan. n[ o]d.] [1913 Webster] 1. (Bot.) The fruit of certain trees and shrubs (as of the almond, walnut, hickory, beech, filbert, etc.),… …   The Collaborative International Dictionary of English

  • jam nut — [1] A second nut on a screw or bolt which locks against the first nut (i.e., jams against it) so that the nut won t come loose. [2] A self locking nut …   Dictionary of automotive terms

  • jam nut. — See lock nut (def. 2). [1860 65] * * * …   Universalium

  • jam nut. — See lock nut (def. 2). [1860 65] …   Useful english dictionary

  • jam nut — noun Etymology: jam (II) : locknut 1 …   Useful english dictionary

  • Jam — Jam, n. [Prob. fr. jam, v.; but cf. also Ar. jamad ice, jelly, j[=a]mid congealed, jamd congelation, ice.] A preserve of fruit boiled with sugar and water; also called {jelly}; as, raspberry jam; currant jam; grape jam. [1913 Webster] {Jam nut}.… …   The Collaborative International Dictionary of English

  • Jam weld — Jam Jam, n. [Prob. fr. jam, v.; but cf. also Ar. jamad ice, jelly, j[=a]mid congealed, jamd congelation, ice.] A preserve of fruit boiled with sugar and water; also called {jelly}; as, raspberry jam; currant jam; grape jam. [1913 Webster] {Jam… …   The Collaborative International Dictionary of English

  • Nut — (n[u^]t), n. [OE. nute, note, AS. hnutu; akin to D. noot, G. nuss, OHG. nuz, Icel. hnot, Sw. n[ o]t, Dan. n[ o]d.] [1913 Webster] 1. (Bot.) The fruit of certain trees and shrubs (as of the almond, walnut, hickory, beech, filbert, etc.),… …   The Collaborative International Dictionary of English

  • Nut buoy — Nut Nut (n[u^]t), n. [OE. nute, note, AS. hnutu; akin to D. noot, G. nuss, OHG. nuz, Icel. hnot, Sw. n[ o]t, Dan. n[ o]d.] [1913 Webster] 1. (Bot.) The fruit of certain trees and shrubs (as of the almond, walnut, hickory, beech, filbert, etc.),… …   The Collaborative International Dictionary of English

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