Cap nut

Cap nut

A cap nut, or acorn nut, is a nut that is closed on one end and resembles an acorn. By tightening against the end of the bolt, it avoids compression of the part being fastened, and is commonly used to fasten parts that must be able to spin freely. It may also be used to cover the end of the bolt, either to prevent contact with the potentially damaging tip or for aesthetics.


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  • cap nut — A nut that is closed at the threaded end often with a dome. Also see double cap nut inner cap nut outer cap nut …   Dictionary of automotive terms

  • cap nut — noun A closed nut having a dome like cap over the back, protruding part of the engaged screw or bolt. Syn: acorn nut …   Wiktionary

  • cap nut — noun : box nut …   Useful english dictionary

  • double cap nut — (Budd mounting) A type of securing device which consists of an inner cap nut (sleeve nut) and an outer cap nut. It is the most common method for mounting disc wheels in dual …   Dictionary of automotive terms

  • inner cap nut — (sleeve nut) A securing device on a dual mounted disc wheel type where it threads directly on the stud and holds the inner wheel in place against the hub. Also see outer cap nut …   Dictionary of automotive terms

  • outer cap nut — A securing device on a dual mounted disc wheel type where it threads directly on the inner cap nut and holds the outer wheel in place against the hub …   Dictionary of automotive terms

  • nut — [1] A fastening device that is somewhat doughnut shaped with a number of flat surfaces on the outer rim and threads on the inner hole. Also see ball and nut ball worm and nut bolt and nut butterfly nut cap nut captive nut castellated nut castle… …   Dictionary of automotive terms

  • Nut (hardware) — A nut threaded onto a bolt A nut is a type of hardware fastener with a threaded hole. Nuts are almost always used opposite a mating bolt to fasten a stack of parts together. The two partners are kept together by a combination of their threads… …   Wikipedia

  • cap — [1] A protective round cover which is secured to something. [2] A covering over the bed of a truck. [3] The base of a light bulb which fits into a socket. [4] Cleaner air package system of reducing the amount of unburned hydrocarbons in the… …   Dictionary of automotive terms

  • cap screw — n. a kind of bolt used in a tapped hole, usually without a nut, as for fastening cylinder covers, etc …   English World dictionary

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