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Helical spring washers can be seen everywhere，but foreign production of machine tools, robots, manipulators, chemical pumps and other high-end equipment can hardly see helical spring washers, is it foreign engineers in order to cut save costs?

Mechanical engineers like helical spring washers the most, the screw with helical spring washers has become the standard, if you ask them why they use the helical spring washers, they will look down on you, sneer at you, in fact, they should be looked down upon, how many mechanical engineers have seen the standard of the helical spring washers, and how many mechanical engineers have analyzed the force of the helical spring washers?

Helical spring washers should have been discarded long ago, and improper use will reduce the anti-loosening effect of fasteners, which is counterproductive.

In order to completely defeat these stubborn mechanical engineers, I performed a finite element analysis of the size 10 open spring washer, and the results were disastrous.

The tensile strength of the steel wire for making helical spring washers is up to 1078MPa, After applying a force of 500N, the strain is 3.89mm, but the maximum stress of the helical spring washer is as high as 3770MPa, which far exceeds the yield strength of the material, as shown in the figure below:

As a result, a force of 500 N was able to force the size 10 helical spring washer into a permanent deformation. And the M10 12.9 screw, the tightening torque is 69Nm, the preload is 30000N,500N the helical spring washer VS 30000N screw, it is not an order of magnitude at all, it is really whimsical to use them together.