Whenever you have to mount a pcb in place. Most of the time it is easier if we use the screws it on/in the enclosures.
There are standards for screws which are already available in the market. Which will reduce the BOM cost.
If you happen to calculate the screw dimensions based on the mechanical stresses. That would be the best. Since it gives you an optimum result in terms of material choice, strength and cost of the screw.
But in when you want to just mount the PCB on a plastic enclosure then you need to know the dimension in order to provide the provisions for the holes.
There are a few websites which will help in finding the appropriate size screw.
https://www.fasteners.eu/standards/ISO/
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