Other name: mother root, nut, nut.Use: locking joints or other external harness fittings.The working principle of the nut is the friction between the nut and the bolt.. However, the reliability of the load will be reduced. In some important occasions we will take some measures to ensure the reliability of the nut lock. Which is one of the anti - loose measures with the lock nut.There are three kinds of lock nuts:The first is to screw on the same bolt with two same nuts, and attach a tightening torque between the two nuts, making the bolt reliable.The second is a special anti - loose nut, and a need to use anti - loose gaskets. Special anti loose nut not hexagon nut, but a round nut, nut on the circumference of the opening in the three, four, six or eight gap (as the nut size and manufacturers of products series vary), the focal point of the notch is tightening tools and loose proof pad bayonet clip in place.The third is nut in the circular surface to the inner circular surface thread drilled through the threaded hole (usually two, on the outer circle surface of 90 distribution) to screw in small diameter countersunk head screws, the purpose is to the threaded exerts a centripetal force, prevent the locking nut is loose. The market sales of quality better lock nut in the nut inside the circle surface inlaid with with the lock nut thread copper pieces to avoid radial top screw directly and the locked thread contact and damaging the latter. The lock nut is gradually applied to the shaft end locking of the rotating movement parts, such as the anti loosing of the ball screw mounting end bearing..Second kinds of anti - loose methods are more reliable than the first one, but the structure is relatively complex. Third minutes compared with the first two, with the effect of the pine is better and the structure is more simple and beautiful and axial size smaller features.