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What are lock nuts and self-locking nuts

Update:30-09-2021
Summary:

The working principle of the lock nut is self-locking b […]

The working principle of the lock 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 self-locking nut?
The function of the self-locking nut is mainly to prevent loosening and 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.
What is a lock nut?
There are generally two types 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, It needs to be used with a kind of anti-loose gasket. The special lock nut is not a hexagonal nut, but a middle round nut. There are 6 notches on the circumference of the nut. These six notches are not only the focus of the tightening tool, but also the locking of the lock washer bayonet. Place. The second anti-loose method is more reliable than the first, but the structure is relatively complicated.
In some important occasions, we will take some anti-loosening measures to ensure the reliability of the nut locking. The use of lock nuts is one of the anti-loosening measures. 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.

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