What is the working principle of a locking nut?

Nut principle: The working principle of a nut is to use the frictional force between the nut and the bolt for self-locking. However, the reliability of this self-locking will decrease under dynamic loads. In some important occasions, we will take some anti loosening measures to ensure the reliability of nut locking. One of the anti loosening measures is to use a locking nut.
What is a lock nut? There are also two types of lock nuts
One method is to screw two identical nuts onto the same bolt and attach a tightening torque between the two nuts to ensure reliable bolt connection.
The other type is a specialized locking nut that needs to be used together with a locking washer.
The special anti loosening nut is not a hexagonal nut, but a round nut with 6 notches on the circumference of the nut. These six notches are not only the focus of tightening the tool, but also the clamping point of the anti loosening gasket. The second anti loosening method is more reliable than the first, but the structure is relatively complex. What is the difference between a locking nut and a self-locking nut? The main function of a self-locking nut is to prevent loosening and vibration. For special occasions. Locking nuts and self-locking nuts are the same concept, and nuts with self-locking function are called locking nuts. There are relevant standards for screwing in torque and screwing out torque, which can be referred to in the mechanical design manual or national nut standards.