How to solve the loose hex screw

There must be some problems during the use of the screw. For example, the phenomenon of loosening is more common. Maybe many people encounter this loosening. Basically, they can be tightened directly. However, this is also very common. It is easy to cause the next loosening, so our outer hexagonal screws are the same, but if we want to tighten it, we must first know what is the cause of the loosening. Let ’s find out below.

 
1. Friction prevention
This is a widely used anti-loosening method. This method creates a positive pressure between the thread pairs that does not separate from the external force, so as to produce a friction force that can restrain the relative rotation of the thread pairs. This positive pressure can be achieved by pressing the screw pair axially or simultaneously.
2. Mechanical anti-loosening
Use cotter pin, stop washer, string wire rope, etc. Mechanical anti-loosening methods are relatively reliable. To deal with important connections, mechanical anti-loosening methods should be used.
3, anti-loose
Spot welding, riveting, bonding, etc. In this method, the threaded fasteners are usually crushed during disassembly and cannot be reused.
4.Riveting and anti-loosening
After tightening, the punch point, welding, bonding and other methods are accepted to make the threaded pair lose the characteristics of the movable pair and the connection becomes inseparable. The disadvantage of this method is that the bolt can only be used once, and the disassembly is very difficult, and the bolt pair must be crushed to be disassembled.
5. Structure anti-loosening
The structural anti-loosing does not depend on manpower outside the circle, but only on its own structure. The structural loosening prevention method, namely the Down's screw loosening prevention method, is also a good method for preventing loosening, but it is not known to most people.

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