Plain washers are usually thin pieces of various shapes to reduce friction, prevent leakage, isolate, prevent loose or diffuse pressure. There are many materials and structures that are used to perform similar functions. The material and process limitation of threaded fastener, the supporting surface of Bolt and other fasteners is not large, so the surface of the connecting piece is protected by the compressive stress of the pressure surface, which adopts the washer. In order to prevent loose connection vice, loose Spring washer and multi toothed locking washer, round nut stop washer and saddle, waveform, conical elastic washer are used.
Plain washers are mainly used to reduce the pressure, when some parts tighten the axial force is very large, easy to make the washer into disc shape, then can use material and improve hardness to solve.
The locking effect of spring washer is generally, the important part is used as little or no use, and the self-locking structure is adopted. For high speed tightening (pneumatic or electric) spring washers, preferably with surface phosphating treatment washers, improve their grinding performance, otherwise easy to rub heat and burn or mouth, even damaged the surface of the connector. The spring washer structure should not be used for the thin plate connection. According to statistics, spring washers are used in the car less and fewer.
The connecting tooth shape in the tooth-shaped elastic washer is used more in the automotive industry because of the large locking force and uniform, and the interval tooth type is less.
For spring washers, elastic washers, according to GB, general can choose GB699-1999 "high quality carbon structural steel" in 60, 70 steel and 65Mn steel.