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What are the five types of lock nuts?

Update:19-07-2021
Summary:

The first is to use two identical nuts to screw on the […]

The first 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 second type of lock nut is composed of two parts, each part has a staggered cam. Because the internal wedge design slope angle is greater than the nut angle of the bolt, this combination is tightly bitten into a whole, when vibration occurs When, the convex parts of the DISC-LOCK anti-loosening nut are staggered to each other, generating lifting tension, so as to achieve a perfect anti-loosing effect.
The third 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 notches 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 fourth 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. A lock nut with better quality on the market is inlaid with a small piece of copper that is consistent with the thread of the lock nut on the inner surface of the nut to prevent the radial jack screw from directly contacting the locked thread and damaging the latter . This kind of lock nut has gradually begun to be applied in the occasion of the shaft end locking of rotating parts, such as the anti-loosening of the bearing at the mounting end of the ball screw.
The fifth type is structural anti-loosening. Through the design improvement of the thread structure, a self-locking function is obtained without the help of other external factors. Therefore, its applicability is wider than the above-mentioned methods, and the requirements for the environment are also relatively more. Low, such as Spirax lock nut. There are many types of locknuts, such as nylon nuts and flange nuts. In short, this kind of locknut is used to prevent loosening. Twist the nut onto the screw, screw, bolt, etc., so that it won't come loose. They can be actively connected together, so that they are firm and stable to a high degree.

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