Plate nut
Encyclopedia
A plate nut, also known as a nut plate, is a stamped
Stamping (metalworking)
Stamping includes a variety of sheet-metal forming manufacturing processes, such as punching using a machine press or stamping press, blanking, embossing, bending, flanging, and coining. This could be a single stage operation where every stroke of the press produce the desired form on the sheet...

 sheet metal
Sheet metal
Sheet metal is simply metal formed into thin and flat pieces. It is one of the fundamental forms used in metalworking, and can be cut and bent into a variety of different shapes. Countless everyday objects are constructed of the material...

 nut
Nut (hardware)
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' friction, a slight stretch of the bolt, and compression of the parts...

 that is rivet
Rivet
A rivet is a permanent mechanical fastener. Before being installed a rivet consists of a smooth cylindrical shaft with a head on one end. The end opposite the head is called the buck-tail. On installation the rivet is placed in a punched or pre-drilled hole, and the tail is upset, or bucked A rivet...

ed to a workpiece. They have a long tube that is internally threaded and a plate with two clearance holes for rivets. They were originally developed for the aerospace industry, but are now also common in automotive racing.
These nuts are made up of variety of soft and hard materials.The choice of material depends on environment to which nut is subjected.Soft materials like copper or brass are used when nut is used in electrical application.Hard materials are used when nut is subjected to high stress environment.Sometimes stainless steel or nickel plated nuts are used in order to increase corrosion resistance.

Locknut
Locknut
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...

 types are available, which utilize a nylon locking element, much like a nyloc nut
Nyloc nut
A nyloc nut, also known nylon insert lock nut, polymer insert lock nut or elastic stop nut , is a kind of nut that includes a nylon collar insert. The insert is placed at the end of the nut and its inner diameter is slightly smaller than the major diameter of the screw...

.These lock nuts are used when nut is subjected to constant changes in environment or to vibrations.The nylon insert expands and stops vibrations of nut and acts as a locking arrangement. Other types have a floating nut or replaceable locking elements.
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