Nuts, adj.: what you must be to attempt this job.
Nuts used in DIY
The standard nut
Most commonly used with roofing bolts
Has 2 wings. Designed for tightening by hand
Nylon lock or nylock nuts
The ring of nylon creates friction, preventing the nut coming undone by itself.
Has spikes and Fits into a hole in wood. Tightening the bolt pulls the spikes into the wood.
aka Chicago bolt. A hollow bolt, into which screws a solid bolt. Used to fix kitchen cabinets together.
Flange spreads load somewhat like a washer. Ribbing on the flange is intended to discourage the nut from coming loose.
Decorative bright polished chrome dome on the topside of the nut. Used where the nut will be in plain view.
There are several other types not usually used in DIY, but available if needed.
The tool driven portion of the nut shears off when tight, leaving a nut that can not be undone with any type of nut driver. A high security nut.
Used with a drilled bolt and split pin. Prevents nut coming undone. Used on cars in areas such as wheel bearings.
A nut that fixes to a hole in sheet metal. Its riveted in place.
Presses into a hole in metal. Has a ribbed outer edge.
A metal cage holds the nut in place next to a square hole in sheet metal.