Hexagon nuts are components used to tightly connect machinery and equipment, joining together with the same-sized nuts and screws via the internal threads. There are numerous types of nuts, commonly including GB, BS, ANSI, and JIS standards. Nuts are categorized by material, such as carbon steel, high-strength, stainless steel, and plastic steel.

Hex nuts are used with bolts and screws for connecting and securing machine parts. The 1-type universal nuts are widely applied, while C-grade nuts are used on machinery, equipment, or structures with rough surfaces and lower precision requirements; A-grade and B-grade nuts are used on machinery, equipment, or structures with smooth surfaces and higher precision requirements. The 2-type hex nuts have a thicker thickness M and are often used in situations that require frequent assembly and disassembly. Hex thin nuts have a thinner thickness M and are commonly used when the surface space of the connected parts is limited.