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The friction force between the expansion nut and the Binx nut can be converted into an excellent self-locking effect. There are two slots in the upper part of the nut. When the nut is tightened on the bolt, the thread of the bolt will screw into the slot in the cross section of the nut, and the thread will be gradually locked by the side wall of the nut to achieve the self-locking function. Exquisite production technology can make the torque type of locking elements consistent. The products are generally used in railway casting, rail transit, transmission system, mining equipment, highway, military oil extraction machinery, automobile industry, public facilities, subway engine, construction machinery, aerospace, drilling equipment, bridge generator, agricultural machinery, shipbuilding, metallurgy equipment, train compressor, medical machinery Signal system wind power generation.