Hexagonal nuts are used in conjunction with bolts and screws to connect and fasten parts. Among them, type I hexagonal nuts are the most widely used. Grade C nuts are used for machines, equipment or structures with rough surface and low precision requirements. Grade A and B nuts are used for machines, equipment or structures with relatively smooth surface and high precision requirements. Type II hexagonal nuts are thicker in thickness m and are often used in occasions where assembly and disassembly are often required. The thickness of hexagonal thin nut m is thinner, which is mostly used when the surface space of the connecting parts is limited.
1.Hexagon nut – widely used, characterized by large tightening force, the disadvantage is that there should be enough operating space in the installation, which can use flexible wrench, open wrench or glasses wrench.
2. Round head hex socket nut – the most widely used in all screws, because its tightening force is relatively large,it can be operated by inner hexagon wrench, installation is very convenient, almost used in various structures, the appearance is more beautiful and neat, the disadvantage is that the tightening force is slightly lower than the outer hexagon, in addition, repeated use is easy to damage it,so that, causes the impossibility of disassembly.
3. pan head hex socket nut- their mechanical properties are the same as the above. They are mostly used in furniture. Their main function is to increase the contact surface with wooden materials and the ornamental appearance.
4. Hex socket nut without head -it’s necessary for special structures, such as the structure that needs the supporting force, or places where round heads need to be hidden.
5. countersunk hex socket nut – mostly used in power machinery, the main function is the same as the inner hexagons.
6. Nylon locking nuts – Nylon rubber ring inlaid in hex nut to prevent loosening of threads, which can be used in strong power machinery.
7. Flange nuts – mainly play the role of increasing the contact surface with the workpiece, operated
8. hex nut – the most widely used, but also one of the most common fasteners.