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The locknut is a common fastening locknut. In some important occasions, during the operation of mechanical equipment, the nut will loosen due to long service time. At this time, we will take some anti loosening measures to ensure the reliability of nut locking, and the locknut will come in handy. Nowadays, many locknuts are made of nylon, that is, a layer of nylon is embedded on the nut as anti loose material. Now let's take you to know how the lower locknut is locked.

Locking principle of locknut

There is a 30 degree wedge surface at the top of the traditional 60 degree tooth tip. This structure enables the bolt to obtain greater friction between the male and female threads after tightening with the nut, so it has a good anti loosening effect. There are four ways to prevent the loosening of locknuts, including friction locking, mechanical nut locking, rivet punching locking and structural locking. These locking 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 locknut is tightened is much greater than that of the ordinary standard nut, which has great anti loosening and anti vibration ability.  

Second, it has strong wear resistance and shear resistance: the 30 ° inclined plane at the bottom of the nut thread can make the nut locking force evenly distributed on the threads of all teeth. Because the pressing force on the thread surface of each tooth is evenly distributed, the nut can better solve the problems of thread wear and shear deformation.  

Third, good reusability: a large number of applications show that the locking force of the locknut remains unchanged after repeated tightening and disassembly, and the original locking effect can be maintained.  

It can be seen from this that the locknut has excellent locking characteristics. How to correctly use this nut is now introduced to you.

Installation, use and precautions of locknut:

The special locknut needs to be used with a kind of locking gasket. The special locknut is not a hexagonal nut, but a 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). These notches are not only the focus of the tightening tool, but also the clamping position of the locking pad bayonet.

Locknuts can only be used for rigid connections, not for flexible connections.

The connection of the locknut has directionality. It can only have the locking effect if it is screwed in in the correct direction. It is recommended to use the type with flange and flange face.  

In addition, the locknut requires a preset torque, and a relatively large installation torque is required during installation. In this process, it is very easy to "bite" or "lock", especially the stainless steel locknut. If it is locked, it can only be solved by breaking, such as cutting off bolts. Before installation, pay attention to lubricating the nut (apply wax or other resin relaxant) and reduce the installation torque and speed, which can effectively relieve the locking of the locknut.

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