Discussing the Locking Function of the Locknut

As one of the hardware fasteners, locknuts have always been highly valued by many industries, not only because of their wide range of applications, but also because this anti-loosening type of nut can solve some problems of parts loosening to a certain extent. In addition, this locknut has the following special advantages:

Advantages of the locknut

• High-strength wear resistance and shear resistance. When tightening the internal threads of the locknut, the normal force generated when the locknut is tightened is much greater than that of a regular standard nut. It has great anti-loosening and anti-vibration capabilities.

• Superior anti-vibration performance. The 30° inclined surface on the thread bottom of the locknut enables the locking force of the nut to be evenly distributed among all teeth. Due to the even distribution of the compressive force on each tooth thread surface, the locknut can better solve the problems of thread wear and shear deformation.

• Repeatable use and secondary utilization of resources. After repeated tightening and disassembly, the performance remains stable, and the locking force does not decrease, maintaining the original locking effect.

The anti-loosening method of the locknut can be divided into multiple types

The locking function possessed by the locknut enables the nuts to have a good anti-loosening effect in practical applications. There are four anti-loosening methods when applied, as shown below:

• Riveting and punching anti-loosening. After tightening, methods such as punching, welding, and bonding are used to make the locking nut couple lose the characteristics of the moving couple and become a non-detachable connection.

• Friction anti-loosening. This is the most widely used anti-loosening method. This method produces a positive pressure between the locking nut pairs, which can generate frictional force that can prevent relative rotation.

• Structural anti-loosening. It is the anti-loosening method of the locking nut itself, namely the Tang locknut method.

• Mechanical anti-loosening. It directly restricts the relative rotation of the locking nut pair using the locking nut stopper.

Ningbo DT Fasteners strictly implements quality system standards. Each link from raw material processing to production is operated according to strict technical procedures, and is equipped with high-quality quality control personnel and complete testing equipment. In 2015, it successfully passed the quality system certification and was awarded the national export product management level one enterprise.