What is a self-locking nut?

A locknut, also known as a lock nut, locking nut, self-locking nut, prevailing torque nut, stiff nut or elastic stop nut, is a nut that resists loosening under vibrations and torque.Self-locking nuts are nuts that can lock themselves by friction. Ordinary nuts will loosen themselves due to vibration and other reasons during use. To prevent this phenomenon, self-locking nuts were invented. The main function of self-locking nuts is to prevent loosening and vibration. They are used in special occasions. Their working principle is generally self-locking by friction. Self-locking nuts are classified by function into types such as embedded nylon rings, necked ends, and metal anti-loosening devices. They all belong to effective torque anti-loosening nuts.

Self-locking nuts generally rely on friction. The principle is that the embossed teeth are pressed into the preset holes of the sheet metal. Generally, the diameter of the preset holes is slightly smaller than that of the rivet nuts. The nut is connected to the locking mechanism. When the nut is tightened, the locking mechanism locks the ruler body and the ruler frame cannot move freely, achieving the purpose of locking; when the nut is loosened, the locking mechanism disengages the ruler body and the ruler frame moves along the ruler body.

High-strength self-locking nuts for ships and bridges can convert friction into expansion force between the bolt and the slot nut to achieve an excellent self-locking effect. There are two narrow slots on the upper part of the ESL nut. When the nut is tightened on the bolt, the thread of the bolt will be screwed into the narrow slot on 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. The exquisite production process can make the torque type of the locking element consistent. The products are generally used in railway casting, rail transportation, transmission systems, mining equipment, highways, military, oil production machinery, automotive industry, public facilities, subways, engines, construction machinery, aerospace, drilling equipment, bridges, generators, agricultural machinery, shipbuilding industry, metallurgical equipment, trains, compressors, medical machinery, signal systems, wind power generation.