Why Can’t Stainless Steel Screws And Nuts Be Used Together?

We all know that only nuts are used for the machine screws, self tapping screws don’t require nuts. But why can’t stainless steel screws and nuts be used together?

If using stainless steel screws and nuts in low temperature pipe flange assembly. After a period of time, it’s very easy to seizure of the threads. This’s because after the tightening, the overall structure of the thread and the screw will be slightly deformed, resulting in tighter engagement.Or a long time, the screws and screw holes will have a fusion phenomenon. It is very difficult to remove the screws and nuts after this happens. More force will be needed to overcome the friction of the threaded connection and to overcome the energy generated by the deformation of the material and the destruction of intermolecular polymerization.

So how to split stainless steel screws and nuts do?

Replace the material. The material of the nut is changed to copper to avoid the phenomenon of fusion.
Apply some grease to the screw before turning the nut.
The use of anti-biting agents can prevent parts from corrosion, sintering, rust and wear at high temperatures.