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washers
You can see a lot of washers used with bolts and nuts.
It's a thin flat one with a hole in the middle.
There is a hole in the middle, and the flat one is inserted between the object, the nut and the bolt.
Vibration can loosen the bolted joint, which can cause a big accident.
Washers act to prevent this loosening.
Because of this, it is used in all important industries such as shipbuilding and automobile industries.
There are many different types of washers, and the most common type of washer is a flat washer.
Springs washers: Increased friction of the thread prevents it from being loosened by vibration. Broken twisted shape in the middle
Wave washers: Combines the functions of the flat washer and the spring washer and also has a relaxation prevention function.
Square washers: Same as flat washer and square in shape
There are many other washers.
Washers material is used for carbon steel S45CM(SAE1045), S65CM(SAE1065), S70CM(SAE1070), S75CM(SAE1074).
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