What are the ways to prevent loosening of the outer hexagonal galvanized bolts?

2023/07/27

The outer hexagonal galvanized bolt can also be called the outer hexagonal galvanized screw, the outer hexagonal galvanized screw and the like. These names all have the same meaning, and they all describe hexagonal galvanized bolts. 1. Outer hexagonal galvanized bolts can generally be divided into three general bolts: A, B, and C. A and B bolts are special bolts, which are relatively less used. Class C is the general bolt, which is widely used. 2. External bolts Galvanized bolts Under normal circumstances, C-level general bolts are usually used in some temporary connections and connections that need to be disassembled. M16, M20, M24 general bolts are usually used in building construction. In addition, there are also some indiscriminately manufactured bolts with relatively large diameters, which are generally used in the field of mechanical engineering, and the main purpose is relatively unique. Friction and anti-loosening Friction and anti-loosening is the most commonly used method of anti-loosening, and it is a method that is used more. This method is created in the middle of the thread pair, which can suppress the sliding friction of the thread pair's relative rotation. The positive pressure changed by external force. The positive pressure is achieved by clamping the thread pair radially or simultaneously in two directions. Such as the use of lock nuts, ductile seals, double nuts and polyester insert locknuts, etc. This kind of anti-loosening method can be more convenient to disassemble the nut, but it will be affected by the environment, such as pressure, vibration and variable load, the bolt will loosen, resulting in the loss of pre-tightening force, and with the passage of time, the loss The pretightening force will become more and more sluggish, which will eventually cause the nut to loosen and the threaded connection to be invalid. Anti-loosening of mechanical equipment When dealing with critical connections, pins, stop washers, and strings of galvanized steel wire ropes are used. This type of anti-loosening method for mechanical equipment is more reliable. Long-term anti-loosening This method mainly adopts methods such as welding, riveting, and bonding. Most of the threaded standard parts need to be broken during disassembly and assembly, which cannot be reused.

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