4 common Hex Nut classifications and their advantages:

1. Ordinary external hexagon: It is widely used, and is characterized by a relatively large tightening force. The disadvantage is that there must be enough operating space during installation. During installation, you can use an adjustable wrench, an open-end wrench, or a glasses wrench. The above wrenches all require a large amount of Operating space.

2. Cylindrical head hexagon socket: It is the most widely used of all screws because it has a relatively large tightening force and can be operated with a hexagon wrench. It is very convenient to install and is used in almost all kinds of structures. The appearance is more beautiful and neat. The tightening force is slightly lower than the outer hexagon, and it is easy to damage the inner hexagon after repeated use and cannot be disassembled.

3. Pan head inner hexagon: rarely used mechanically, the mechanical properties are the same as above, mostly used in furniture, the main function is to increase the contact surface with wooden materials and increase the ornamental appearance of the appearance.

4. Headless inner hexagon: It must be used in some structures, such as the top wire structure that requires a large jacking force, or where the cylindrical head needs to be hidden.