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.

Nuts are parts that closely connect mechanical equipment. Nuts and bolts of the same specification can only be connected together through the inner thread. For example, M4-P0.7 nuts can only be connected with M4-P0.7 series bolts (in nuts, M4 refers to the inner diameter of the nut is about 4mm, and 0.7 refers to the distance between two threads is 0.7mm); American products are the same. For example, 1/4-20 nut can only be matched with 1/4-20 screw (1/4 refers to the inner diameter of the nut is about 0.25 inch, and 20 refers to 20 teeth in each inch).