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How to prevent loosening of locknuts?

Update:26-07-2021
Summary:

Anti-loosening nut is a common type of tightening anti- […]

Anti-loosening nut is a common type of tightening anti-loosening nut. In some important occasions, in the operation of mechanical equipment, the nut will loosen due to long use time. At this time, we will take some anti-loosing measures to ensure that the nut is locked. The reliability of the locknut comes in handy. Many of the current locknuts are made of nylon, that is, a layer of nylon is embedded on the nut to make the locknut. Below, we will show you how to prevent loosening of the lower lock nut.
Anti-loosening nut is a common type of tightening anti-loosening nut. In some important occasions, in the operation of mechanical equipment, the nut will loosen due to long use time. At this time, we will take some anti-loosing measures to ensure that the nut is locked. The reliability of the locknut comes in handy. Many of the current locknuts are made of nylon, that is, a layer of nylon is embedded on the nut to make the locknut. Below, we will show you how to prevent loosening of the lower lock nut.
Anti-loosening principle of the anti-loosening nut: There is a 30-degree wedge surface at the top of the traditional 60-degree tooth tip. This structure allows the male and female threads to obtain greater friction between the male and female threads after the bolt is tightened with the nut. So there is a good anti-loose effect. There are four ways to prevent loosening of the anti-loosening nut: friction anti-loosening, mechanical nut anti-loosening, riveting anti-loosening, and structural anti-loosening. These several anti-loose methods can be found in detail on the Internet, so I won't explain them here.
Three advantages of locknuts:
First, superior anti-vibration performance: the normal force generated when the anti-loosening nut is tightened is much greater than that of the ordinary standard nut, and it has great anti-loosing and anti-vibration ability.
Second, strong wear resistance and shear resistance: the 30° inclined surface of the nut thread bottom can make the nut locking force evenly distributed on all the threads of each tooth. Since the compression force on the thread surface of each tooth is evenly distributed, so Nuts can better solve the problems of thread wear and shear deformation.
Third, good reusable performance: Extensive use shows that after repeated tightening and disassembly of the locknut, its locking force is still not reduced, and the original locking effect can be maintained.
It can be seen that the anti-loosening nut has excellent anti-loosing characteristics. How to use this kind of nut correctly, now I will introduce to you.
Precautions for installation and use of locknut:
A special lock nut needs to be used together with a lock washer. The special lock nut is not a hexagonal nut, but a 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 insertion place of the locking gasket of the anti-loosening gasket.
Locknuts can only be used for rigid connections, not flexible connections.
The connection of the anti-loosening nut is directional, and the anti-loosening effect can only be achieved by screwing in the correct direction. It is recommended to use the type with flange and flange surface.

In addition, the locknut requires a preset torque, and a relatively large installation torque is required during installation. During this process, it is very easy to "seize" or "lock up", especially for stainless steel locknuts. If it is locked, it can only be solved by breaking, such as cutting off the bolt. Before installation, pay attention to lubricating the nuts (wax, or other resin loosening agents), reduce the installation torque and speed, which can effectively alleviate the locking of the locknut.

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