Nut (hardware)
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A nut is a type of fastener with a threaded hole. Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together. The two partners are kept together by a combination o
An M4 nut threaded onto an Allen key socket head screw
Nuts come in many sizes. This one is part of the Sydney Harbour Bridge.
Left to right: Wing, hex, hex flange, and slab weld nuts.
Left to right: Slotted, square (upper), T-nut (lower), cap (or acorn), nylon locking (top and side views), and castellated nuts.
Threaded insert
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A threaded insert, also known as a threaded bushing or insert nut, is a fastener element that is inserted into an object to add a threaded hole. They may be used to repair a stripped threaded hole, pr
A self-tapping insert
A helical insert. The straight radial piece is the driver tang which is used to grip the coil while driving it into place. It is broken off and is discarded after installation.
Rampa- or screw-in nut