Stainless steel screws usually refer to steel screws with resistance to corrosion of air, water, acid, alkali, salt or other media.

According to the different composition of the alloy, respectively focus on rust resistance and acid resistance.

Although some steels have rust resistance, but not necessarily acid resistance, acid resistance steels are usually rust resistance.

So what is the reason for the fracture of stainless steel screws?

1,Quality of screws

2,Strength of screws

3,Pre-tightening torque of screws

4, the fatigue strength of the screw screw material is not qualified, heat treatment is not qualified, the product manufacturing process is not qualified, the stainless steel screw is not reasonable, the use of the environment is bad and so on have a direct impact.

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In the case of these prerequisites are standardized, the majority of stainless steel screw fracture is because of loosening and fracture.

Because the stainless steel screw loose interrupt the situation and fatigue fracture is roughly the same, we can always find the reason from the fatigue strength, in fact, the fatigue strength is so large that we can not imagine, stainless steel screws in the use of the process of fatigue strength.

The screw is damaged because of loosening:

After the loosening of threaded fasteners, huge kinetic energy MV2 will be generated. This huge kinetic energy directly acts on fasteners and equipment, causing fasteners to be damaged.

After the fasteners are damaged, the equipment can not work in the normal state, further leading to equipment damage.

Under the action of axial force of the fastener, the thread is broken, the bolt is pulled off.

In fasteners subjected to radial force, the bolts are cut off and the bolt holes are made into ellipses.

The key to solve the problem is to choose the thread anti-loosening method with excellent anti-loosening effect.

The loosening of screw fasteners has nothing to do with the fatigue strength of stainless steel screws: threaded fasteners only need one hundred times to loosen in the transverse vibration loosening experiment.

In fatigue strength tests, vibrations are repeated one million times.

In other words, the threaded fastener loosened at 1/10000 of its fatigue strength.

We only used 1/10000 of its maximum strength, so the threaded fastener loosened not because of the fatigue strength of the bolt.