washerless, adj.
/wosh"euhr, waw"sheuhr/, n.
1. a person or thing that washes.
3. a flat ring or perforated piece of leather, rubber, metal, etc., used to give tightness to a joint, to prevent leakage, to distribute pressure, etc., as under the head of a nut or bolt.
[1275-1325; ME; see WASH, -ER1]

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▪ machine part
 machine component that is used in conjunction with a screw fastener such as a bolt and nut and that usually serves either to keep the screw from loosening or to distribute the load from the nut or bolt head over a larger area. For load distribution, thin flat rings of soft steel are usual.

      To prevent loosening, several other types of washers are used. All act as springs to compensate for any increase in the distance between the head of a bolt and the nut, or between the head of a screw and the object being clamped. In addition to the spring action, some of these washers have teeth that bite into the workpiece and the screwhead and provide a locking action. They are called tooth or shakeproof lock washers and have teeth that are bent and twisted out of the plane of the washer face.

      The conical washer has spring action, but the only locking action is provided by friction. The helical spring washer is one of the most commonly used lock washers.

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Universalium. 2010.

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Look at other dictionaries:

  • Washer — Wash er, n. [AS. w[ae]scere.] 1. One who, or that which, washes. [1913 Webster] 2. A ring of metal, leather, or other material, or a perforated plate, used for various purposes, as around a bolt or screw to form a seat for the head or nut, or… …   The Collaborative International Dictionary of English

  • washer — flat ring for sealing joints or holding nuts, mid 14c., generally considered an agent noun of WASH (Cf. wash) (v.), but the sense connection is difficult, and the noun may derive instead from the ancestor of Fr. vis screw, vise …   Etymology dictionary

  • washer — ► NOUN 1) a person or device that washes. 2) a small flat ring fixed between a nut and bolt to spread the pressure or between two joining surfaces to act as a spacer or seal …   English terms dictionary

  • washer — [wôsh′ər] n. 1. a person who washes 2. a flat disk or ring of metal, leather, rubber, etc., used variously to make a seat for the head of a bolt or for a nut or faucet valve, to lock a nut in place, to provide a bearing surface, to serve as a… …   English World dictionary

  • washer — A flat disc with a hole in the center. It may be made of metal, rubber, plastic, or leather. It is often placed under a nut to even out pressure and prevent damage to the part on which it rests. See bridge washer crush washer cup washer dish… …   Dictionary of automotive terms

  • washer — (Roget s IV) n. 1. [A flat ring] Syn. disk, seat, packing, collar, lock washer, shim, bushing, patent washer; see also part 2 . 2. [A machine for washing] Syn. automatic dishwasher, washing machine, laundry machine, electric washer, gasoline… …   English dictionary for students

  • Washer — Philippe Washer Philippe Washer Pays représenté(s) …   Wikipédia en Français

  • Washer — The word washer may refer to one of the following: *Washing machine *Washer (hardware) *Headlamp washers. *Mal Washer, an Australian politician …   Wikipedia

  • washer — [[t]wɒ̱ʃə(r)[/t]] washers 1) N COUNT A washer is a thin flat ring of metal or rubber which is placed over a bolt before the nut is screwed on. 2) N COUNT A washer is the same as a washing machine. [INFORMAL] …   English dictionary

  • washer — UK [ˈwɒʃə(r)] / US [ˈwɑʃər] noun [countable] Word forms washer : singular washer plural washers 1) a small flat ring used for filling the space between two metal parts, for example between a surface and the top of a screw 2) informal a washing… …   English dictionary

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