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What is the difference between locknut and other nuts?

Update:06-04-2021
Summary:

Locknuts include non-metallic nested nuts, embedded ste […]

Locknuts include non-metallic nested nuts, embedded steel sheet nuts, embedded spring steel wire nuts, flange indentation nuts, flat nuts, etc. Non-metallic nested nut: This kind of nut has no anti-loose property, only some anti-drop property. It clamps the bolt by the tension of the nylon ring.
Spring wire nut (that is, wire thread insert): There are two parts inside the nut. The pitch of the spring is different from the pitch of the thread. The inner diameter of the spring is small, and it has a little anti-falling property.
Lock nut purpose: to lock the outer joint of the harness or other pipe fittings. 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. There are also three types of lock nuts: the first 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 second type 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 3, 4, 6 or 8 gaps on the circumference of the nut (depending on the size of the nut and the product series of the manufacturer). Several notches are not only the focus of the tightening tool, but also the entry point of the locking washer. The third type is to drill through threaded holes from the outer surface of the nut to the inner thread surface (usually two, distributed at 90 on the outer surface), which are used to screw in small diameter countersunk screws for the purpose of threading Apply a centripetal force to prevent the lock nut from loosening.

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