What is a plain washer?

Introduction to flat washer:

Flat washers are usually thin parts of various shapes, which are used to reduce friction, prevent leakage, isolate, prevent loosening or disperse pressure. Many materials and structures have such components to perform various similar functions. Limited by the material and process of threaded fasteners, the bearing surface of fasteners such as bolts is small. Therefore, in order to reduce the compressive stress on the bearing surface and protect the surface of the connected parts, washers are used.

Definition of flat washer:

Flat washers are usually thin parts of various shapes, which are used to reduce friction, prevent leakage, isolate, prevent loosening or disperse pressure. Many materials and structures have such components to perform various similar functions. Limited by the material and process of threaded fasteners, the bearing surface of fasteners such as bolts is small. Therefore, in order to reduce the compressive stress on the bearing surface and protect the surface of the connected parts, washers are used.   in order to prevent the loosening of the connecting pair, anti loose spring washer, multi tooth lock washer, round nut stop washer and saddle shaped, wave shaped and conical elastic washer are used.

The flat washer is mainly used to reduce the pressure. When the tightening axial force of some parts is very large, it is easy to press the washer into a dish shape. At this time, it can be solved by using materials and improving the hardness.

The locking effect of spring washer is general, and the important parts shall be used or not used as much as possible, and the self-locking structure shall be adopted. For the spring washer used for high-speed tightening (pneumatic or electric), it is best to use the washer with surface phosphating treatment to improve its wear reduction performance, otherwise it is easy to burn or open the mouth due to friction and heating, and even damage the surface of the connected parts. Spring washer structure shall not be used for thin plate connection. According to statistics, spring washers are less and less used in cars.

Because the locking force is large and uniform, the connecting tooth shape in the tooth shaped elastic washer is more used in the automotive industry, while the spacer tooth type is less.