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A locknut, also known as a lock nut, locking nut, prevailing torque nut,〔.〕 stiff nut〔 or elastic stop nut, is a nut that resists loosening under vibrations and torque. Elastic stop nuts and prevailing torque nuts are of the particular type where some portion of the nut deforms elastically to provide a locking action. The first type used fiber instead of nylon and was invented in 1931.〔("Nut With Elastic Ring Can't Work Loose", April 1931, Popular Science ) bottom of page 67 drawing of how lock nuts work〕 Locknuts, jam nuts, lock washers, and thread-locking fluid are ways to prevent vibration from loosening a bolted joint. ==Types== There are various kinds of specialised lock nuts, including: * Castellated nut * Distorted thread locknut * *Centerlock nut * *Elliptical offset locknut * *Toplock nut * *Philidas nut * Interfering thread nut * *Tapered thread nut * Jam nut * Jet nut (K-nut)〔.〕 * Keps nut (K-nut or washer nut) with a free-spinning washer. In the locknut form, this is a star-type lock washer. * Plate nut * Polymer insert nut (Nyloc nut) * Security Lock Nut All steel reusable nut for high vibration and harsh environments. * Serrated face nut * Serrated flange nut * Speed nut (sheet metal nut or Tinnerman nut) * Split beam nut * Palnut 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「locknut」の詳細全文を読む スポンサード リンク
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