- Joined
- Nov 22, 2009
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- 11,601
I think he means the screws must be screwed in to a threaded mate to hold, while pins are just single pieces deformed on the end. With two components in the screw & nut, there is possibly a place for moisture to be trapped between them. Although I don't think this is the case for anything beyond the surface just under the screw head.
Possibly, but trapped moisture presents very little cause for concern if the threads are not reactive. Further, threads can be and often are treated with thread compound which (if properly selected and applied) can guard against moisture intrusion.