What is the working principle of the locking nut?

Nut principle: The working principle of the nut is to use the friction between the nut and the bolt for self-locking. However, the reliability of this self-locking will be reduced under dynamic load. In some important occasions, we will take some anti-loosening measures to ensure the reliability of the nut locking. Among them, the use of locking nuts is one of the anti-loosening measures.

What is a locking nut? There are also two types of locking nuts.

One is to use two identical nuts to screw on the same bolt, and add a tightening torque between the two nuts to make the bolt connection reliable.

The other is a special anti-loosening nut, which needs to be used with an anti-loosening gasket.

The special anti-loosening nut is not a hexagonal nut, but a medium round nut with 6 notches on the circumference of the nut. These six notches are both the focus of the tightening tool and the card-in place of the anti-loosening gasket. The second anti-loosening method is more reliable than the first one, but the structure is relatively complex. What is the difference between locking nuts and self-locking nuts? The main function of self-locking nuts is to prevent loosening and vibration. Used in special occasions. Locking nuts and self-locking nuts are the same concept. Nuts with self-locking function are called locking nuts. There are relevant standards for screw-in torque and screw-out torque. You can refer to the mechanical design manual or national nut standards.