Flat washers are usually thin pieces of various shapes designed to reduce friction, prevent leakage, isolate, prevent loosening or distributing pressure.

These components are found in many materials and structures and are used to perform a variety of similar functions.

Restricted 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 on the bearing surface to protect the surface of the connected parts, gaskets are used.

In order to prevent the loosening of the connecting pair, anti-loose spring washers, multi-tooth lock washers, round nut stop washers and saddle, wave and cone elastic washers are used.

The main purpose

Flat gasket is mainly used to reduce the pressure, when some parts of the tightening axial force is very large, easy to make the gasket pressed into a dish, then can use materials and improve the hardness to solve.

Flat washer is the most common kind of fastener products, it is made of sheet metal stamping, the main application materials are carbon steel, stainless steel, copper.

Flat washer is used with bolts and nuts, used to increase the contact area of bolts, strengthen the friction force, but also play a certain role in leakproof, and can bear the pressure to disperse, prevent the connection of the matrix crushed.

Flat washers are round, the thickness of the standard can be obtained by the specific parameters.

According to the material of the flat washer, it marks the level of 11HV, 140HV, 200HV, 300HV and so on.

The larger the value of this parameter is, the harder the material is and the higher the pressure resistance coefficient is.

The HV parameter value of ordinary standard flat washer is 220HV. If you want higher performance, you need heat treatment.

For 200HV and 300HV grade should choose 45, 50, 60, 70 steel or 65Mn steel, can reach 200 ~ 300HV and 300 ~ 400HV technical requirements through heat treatment quenching and tempering.

Because according to the standard for 100HV, 140HV level of flat gasket can be made of low carbon steel.

General enterprises in the selection of materials are mostly Baosteel materials, easy to cold stamping.