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How do the locking nut works

How do the locking nut works

locking nut what the working principle is to use the friction between the nut and the bolt for self-locking.
In the dynamic load, the reliability of the self-locking between the nut and the bolt will be reduced, and we need to take some anti-loosening measures to strengthen the reliability of the nut locking. The most common method is to use a lock nut

What type of locking nuts

Nylon insert locking nut

Din 985 nylon lock nut is a kind of high-vibration and anti-loosening fastener parts. It is used in conjunction with bolts. A nylon washer is embedded in the upper end of the thread. There are blue, white, or gray washers. It can be applied to all kinds of machinery with temperatures from -50 to 100 degrees Celsius.

Application areas include mining machinery, automobile transportation machinery, agricultural machinery, textile machinery, and electrical products.

The anti-loose performance is much higher than that of ordinary nuts, and the anti-loose life is ten times longer. The use of nylon lock nuts can prevent major accidents caused by loose fasteners, especially mining machinery.

locking nut din 985

All metal locking nut

DIN 980V locking nut, relying on the deformation of the top thread of the nut itself, has the function of locking and preventing loosening. Common forms are three-point extrusion on the end face, elliptical extrusion, and side extrusion.

locking nut din 980v

DIN 980M locking nut, relying on the deformation of the metal locking piece embedded in the nut, the locking ring plays a locking role.

locking nut din 980m

The working principle of Nylon insert lock nut

During the installation of the DIN 985 lock nut, the screw thread of the bolt is squeezed with the nylon embedded in the nut to completely deform the nylon washer. After installation, the nylon and the thread are completely squeezed and contacted, and the squeezed nylon produces an impact on the bolt. The large resilience makes the bolts not easy to loosen. Can play an effective role in preventing loosening.

The working principle of all metal lock nuts

Working principle of DIN 980v lock nut

Through die stamping, the thread of the nut itself has about 3 teeth deformed. After deformation, the inner diameter of the nut thread is slightly smaller than the outer diameter of the bolt thread. After the nut is tightened, the friction between the threads is much greater than that of ordinary threads, which can effectively prevent loosening.

The most intuitive feeling is that the force that will be used when the nut is installed is getting bigger and bigger.

locking nut

Working principle of DIN 980m lock nut

The nut is embedded with a heat-treated metal sheet. The inner diameter of the metal sheet is slightly smaller than the outer diameter of the bolt thread. After the nut is tightened, the metal sheet stops the bolt thread, which can effectively prevent loosening and shock resistance.

Advantages of locknuts

First, superior seismic performance: When the thread is tightened, the crest thread of the bolt tightly enters the 30° wedge-shaped slope of the nut to be clamped, and the normal force exerted on the wedge-shaped slope is related to the axis of the bolt. The included angle is 60° instead of 30°. Therefore, 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, strong wear resistance and shear resistance: the 30° inclined surface of the nut thread bottom can evenly distribute the nut locking force on all the threads of each tooth. Since the compression force on the thread surface of each tooth is evenly distributed, so The locknut 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.

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