4 ways to prevent the Heavy Hex Bolt from loosening:
1. Anti-loosening method, spot welding, riveting, bonding, etc. In this method, threaded fasteners are mostly crushed during disassembly and cannot be reused.
2. Friction anti-loosening method, this method generates a positive pressure between the thread pairs that do not change with the external force, so as to generate a friction force that can restrain the relative rotation of the thread pairs. This positive pressure can be achieved by pressing the thread pair axially or in both directions at the same time.
3. Riveting punching and anti-loosening method, the outer hexagon bolts are subjected to punching, welding, bonding, and other methods after tightening so that the threaded pair loses the characteristics of the movable pair and the connection becomes an inseparable connection. The disadvantage of this method is that the bolt can only be used once, the disassembly is very difficult, and the bolt pair must be crushed to be disassembled.
4. Mechanical anti-loosening method, using split pins, stop gaskets and string wire ropes, etc. The mechanical anti-loosening method is more reliable, and the mechanical anti-loosening method should be used for important connections.