Nuts are nuts, which are screwed together with bolts or screws to play a fastening role. One element that must be used in all production and manufacturing machinery is divided into carbon steel, stainless steel, non-ferrous metals (such as copper) and other types according to different materials.

The nut specification table unifies all kinds of nuts in detail, and subdivides some specifications of nuts with the table. There are many kinds of nuts, but also nuts of different materials. Each type of nut has different specifications, and each screw has its own mechanical properties and functions.