High Load Capacity Flat Metal Washers DIN 125 USS SAE Standard M3-M104 Size

The flat pad, which is mainly punched out with an iron plate, is generally a flat washer with a hole in the middle. This hole size specification is generally based on customer requirements.
Flat washers are usually thin pieces of various shapes to reduce friction, prevent leaks, isolate, prevent loosening, or distribute pressure. This material is used in many materials and structures to perform a variety of similar functions. Due to the limitations of the material and process of the threaded fasteners, the bearing surfaces of the fasteners such as the bolts are not large, so that the surface of the parts to be joined is protected to reduce the compressive stress of the bearing surface, and washers are used. In order to prevent loosening of the connection pair, loose-proof spring washers and multi-tooth lock washers, round nut stop washers and saddle-shaped, corrugated, conical elastic washers are used.
Flat washers are mainly used to reduce the pressure. When some parts are tightened with large axial forces, the washers are easily pressed into a dish shape. In this case, the material can be changed and the hardness can be improved.

According to flat washer performance level, recommended materials are used:
For the 100HV class available with ST12, ST13 and Q235, Q215, Q195, etc., the surface hardness can reach about 110HV;
For the 140HV class with optional 08F, 08Al and 10, 10F, etc., the surface hardness can reach about 140HV;
For the 200HV and 300HV grades, 45, 50, 60, 70 or 65Mn steels should be used. They can be quenched and tempered by heat treatment to 200-300HV and 300-400HV technical requirements.