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Flat washer:definition,function,basic knowledge



The flat washer is mainly stamped out of iron plate, and the shape is generally a flat washer with a hole in the middle.


1. Increase the contact area between the screw and the machine.

2. Eliminate the damage to the surface of the machine when the spring pad is unloading the screw. When used, it must be a spring pad and a flat pad. The flat pad is next to the surface of the machine, and the spring pad is between the flat pad and the nut.

3. basic knowledge

The flat washer is mainly stamped out of iron plate, and the shape is generally a flat washer with a hole in the middle.

The size of this hole is generally determined according to customer requirements.

Flat washers are usually thin pieces of various shapes used to reduce friction, prevent leakage, isolate, prevent loosening, or distribute pressure. Many materials and structures have such components, which are used to perform various similar functions. Limited by the material and process of threaded fasteners, the supporting surface of bolts and other fasteners is not large, so in order to reduce the compressive stress of the pressure-bearing surface to protect the surface of the connected part, washers are used. In order to prevent the loosening of the connection pair, anti-loose spring washers, multi-tooth lock washers, round nut stop washers, and saddle, wave, and cone elastic washers are used.

Flat washers are mainly used to reduce the pressure. When some parts are tightened with a large axial force, the washers are easy to be pressed into a dish shape. At this time, materials can be used and the hardness can be improved to solve the problem.

The locking effect of the spring washer is general, and the important parts are used as little or not as possible, and the self-locking structure is adopted. For spring washers used for high-speed tightening (pneumatic or electric), it is best to use surface phosphated washers to improve their anti-wear performance, otherwise they will easily burn out or open due to friction and heat, or even damage the surface of the connected part. For the connection of thin plates, spring washer structure shall not be adopted. According to statistics, spring washers are used less and less in cars.

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