Nuts are a type of fastener with a threaded hole. Nuts are almost always used in conjunction with a mating bolt to fasten two or more parts together. The two partners are kept together by a combination of their threadsí friction, a slight stretching of the bolt, and compression of the parts to be held together.

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Coupling Nuts
Hexagonal Nuts Locknuts

Flange Nuts
Flange Nuts are nuts that have a wide flange at one end that acts as an integrated, non-spinning washer. This serves to distribute the pressure of the nut over the part being secured, reducing the chance of damage to the part and making it less likely to loosen as a result of an uneven fastening surface.

Hexagonal Nuts
Hexagonal Nuts are the most common hexagonal fastener with internal threads that screws on to the shank of a bolt or a hex cap screw.

Locknuts are nuts that resist loosening under vibrations and toque. 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.