Why can't stainless steel screws and nuts be used together?

When we assemble two objects, we use stainless steel screws and nuts to secure them, so once the time is up, you will find that the screws and nuts will bite.
This is caused by the structural deformation of the threads of stainless steel screws and bolts after tightening.
In addition, over a long period of time, the screws and screw holes will merge, making it difficult to remove the screws and nuts in the future, so it is not recommended to assemble two or more products at the same time. Stainless steel screws and nuts.