The connection prevention method of threaded fasteners is a big summary

The anti-loosening methods of threaded fastener connections are usually divided into three basic types:

Non-detachable anti-loose

This method is an anti-loosening method that uses welding, bonding or punching riveting to change the detachable threaded connection to the non-detachable threaded connection. It is a very reliable traditional anti-loosening method. The disadvantage is that threaded fasteners cannot be reused. And the operation is troublesome. It is often used in some important occasions that require anti-loose and high reliability without disassembly.

Anti-loosening of mechanical fixing parts.

Use mechanical fasteners to fix and pin between the threaded part and the connected part or between the threaded part and the threaded part to prevent loosening. The advantage of this method is that it is anti-loosing and reliable, and its anti-loosing reliability generally depends on the static strength or fatigue strength of the mechanical fixing parts (or the fasteners themselves, such as slotted nuts). Its disadvantage is that it increases the weight of the fastening connection, is troublesome to manufacture and install, and cannot be installed by motor, so the cost is higher. Because of its high reliability, it is still widely used in some important parts of mechanical products and aerospace products. (Guide: The three most commonly used methods for nut surface treatment)

Anti-loosening to increase friction.

This anti-loose method is the most widely used in the machinery manufacturing sector and the aerospace field. The purpose of preventing loosening can be achieved by increasing the friction between the threads or between the bolt (screw) head and the end face of the nut, or increasing the friction of both at the same time. This anti-loose method is less reliable than the previous two methods, but its biggest advantage is that it is not limited by the use of space, can be repeatedly assembled and disassembled many times, and can be assembled by motor, and some of the fasteners ( Such as nylon lock nuts, all-metal lock nuts), its anti-loosening reliability has reached a very high level.

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