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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 ]
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.
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.
ISO 2982-1:2013 Part 1: Dimensions for adapter sleeve assemblies and withdrawal sleeves; ISO 2982-2:2013 Part 2: Dimensions for locknuts and locking devices; ISO 2983:1975 Rolling bearings — Locknuts, wide series, and lockwashers with bent inner tab [Withdrawn without replacement]
Rolling bearings; single row radial contact ball bearings: Active: DIN 625-3: Rolling bearings; double row radial contact ball bearings: Active: DIN 625-4: Rolling bearings; radial contact groove ball bearings with flanged outer ring: Active: DIN 653: Knurled thumb screws, low type: Active: DIN 678-1: Envelopes – Part 1: Sizes: Active: DIN 678-2
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.
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