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2. Locknut - Wikipedia

   en.wikipedia.org/wiki/Locknut

   A locknut, also known as a lock nut, locking nut, self-locking nut, prevailing torque nut, [1] stiff nut [1] or elastic stop nut, [2] is a nut that resists loosening under vibrations and torque. Prevailing torque nuts have some portion of the nut that deforms elastically to provide a locking action. [ 2 ]

3. Security locknut - Wikipedia

   en.wikipedia.org/wiki/Security_locknut

   A security locknut [1] is a type of industrial fastener composed of two steel threaded parts: a nut body and an elliptical spring steel lock ring. Security locknuts are fastened onto a mating bolt to form a bolted joint. Forces of friction (with elastic deformation), a stretching of the bolt, and compression hold the bolted joint firmly together.

4. Nut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Nut_(hardware)

   In applications where vibration or rotation may work a nut loose, various locking mechanisms may be employed: lock washers, jam nuts, eccentric double nuts, [1] specialist adhesive thread-locking fluid such as Loctite, safety pins or lockwire in conjunction with castellated nuts, nylon inserts , or slightly oval-shaped threads.

5. Width across flats - Wikipedia

   en.wikipedia.org/wiki/Width_across_flats

   Fastener terminology of hex nuts: d: Nominal thread diameter k: Wrench size (width across flats) h: Thickness e: Width across corners = Width across flats is the distance between two parallel surfaces on the head of a screw, bolt or nut. The width across flats will define the size of the spanner or wrench needed.

6. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   A fastener comprising a mated pair of screw and post (binding barrel), which are a machine screw and a nut that is barrel-shaped. The nut has a flange and a protruding boss that is internally threaded. The bolt (mated pair, screw and post) sits within the components being fastened, and the flange provides the bearing surface.

7. Jam nut - Wikipedia

   en.wikipedia.org/wiki/Jam_nut

   Standard nut employed as a jam nut against another standard nut. A jam nut is a low profile type of nut, typically half as tall as a standard nut. It is commonly used as a type of locknut, where it is "jammed" up against a standard nut to lock the two in place. It is also used in situations where a standard nut would not fit.