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

What is a lock nut? There are also two kinds of lock nuts.

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

The other is a special lock nut, which needs to be used together with a lock washer.

The special lock nut is not a hexagonal nut, but a middle round nut. There are 6 notches on the circumference of the nut. The six notches are not only the focus point of the tightening tool, but also the insertion point of the lock washer bayonet. . The second anti-loose method is more reliable than the first, but the structure is relatively complicated. What is the difference between a lock nut and a self-locking nut The function of a self-locking nut is mainly to prevent loosening and anti-vibration. For special occasions. A lock nut and a self-locking nut are a concept, and a nut with a self-locking function is called a lock nut. Screw-in torque and screw-out torque have related standards, please refer to the mechanical design manual or national nut standards.