Precautions for use of fasteners
When many people use fasteners, they generally think that fasteners are so insignificant that they

can be replaced with almost anything. What's the use of such accuracy. When using fasteners,

pay special attention to the following situations, which is the most easy mistake for most people.

1, Replace "fine" with "coarse"
In many machines with high safety and mechanical properties, there is a strong demand for them,

so most of them are fine tooth screws. However, during maintenance, it is inevitable that there will

be a lack of parts, so the maintenance personnel will use coarse teeth to replace fine teeth. As a

result, it can be imagined that the machine may not be able to run and is faced with falling apart.

2, Superimpose nuts to increase stability
Some people naively believe that if the nut is folded like equipment, a few more screws will be more

stable and can't be knocked off. However, the more nut rings are stacked, disturbing the load

distribution between threads, it will be easier to loosen.

3, The tighter the screw, the better.
"The fasteners are said to be tightened. Of course, the tighter the better." the screws are tightened

too tightly and directly rub away the teeth. The teeth are worn away. How rough is the surface? Can

the friction force be tightened when the friction force becomes smaller? Therefore, mechanical faults

will occur frequently.

4, The washer is too large to hinder
When there is a lack of suitable washer for maintenance, some maintenance workers will replace it with

a washer with a larger inner diameter, which will greatly reduce the contact area between the lower part

of the head and the washer, and what protective effect will it play.

5, False firmness
Sometimes, some staff take rusty ones instead because of lack of parts. The rusty iron is easy to be

damaged due to fatigue after a long time, resulting in thread thinning and equipment falling apart on

the spot. Therefore, before using fasteners, especially those with high requirements for safety and

stability, new screws must be used or impurities wrapped outside the teeth must be removed before

use.

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