When it comes to screws and bolts, one of the inevitable things that would happen would be for the bolts to lose its threads, brought about by either constant wear and tear, loosening and tightening, as well as rusting due to exposure to open air, as well as water with plenty of dissolved oxygen. The former two would cause the threads of the bolt or screw to grow thinner, and therefore not fit properly or tightly in the hole. The latter, or the exposure to rust, on the other hand, would call for rethreading as the rust would cause the threads to be shallower, as rust may possibly get thicker as time goes by.
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