The working principle of the root is to use the friction between nuts and bolts for self-locking. However, in the case of dynamic load, the reliability of such self-locking is reduced. In some important occasions we will take some anti-loose measures to ensure the reliability of root lock. Root mother is one of the anti - pine measures.

The anti-loosening effect of root mother is mainly determined by the interaction between nut and bolt meshing thread. At present, there are many ways to increase the interaction force between meshing threads, such as the screw structure improvement of the stiffening of the nylon nut, the surface treatment of the thread, etc.