BS 1981 - 1991 Four-Sided Square Head Nut Assortment Kit M3 M4 M5 M6 M8 Square Nut
In some important occasions will take some anti-loose measures to ensure the reliability of the nut locking. The use of locking nut is one of the anti-loose measures. The working principle of the nut is that the friction between the nut and the bolt is used for self-locking. However, the reliability of this kind of self-locking will be reduced under dynamic load.