If too many threads protrude past the nut, it could mean the bolt is too long, and you will be tightening the nut against the shank of the bolt instead of the pieces you are trying to tighten together.
It's the standard. Hardware is designed and built to be used in accordance to specific standards. Improper use, or failure to adhere to hardware standards can reduce the effectiveness of that hardware or even damage components.
ah scary, lots of these tips are outdated and incorrect in todays standards, eg; nyloc nuts are not to be re-used under any circumstance now days, where as this video suggests they can be re used and only if hand wining is possible, only then replace it. wild!!! no wonder crashes were so common back then.
Usually not for structural use. We usually use safety wire or cotter pins. The nylons we do use aren't re-used. Nylons also aren't used in areas that are subject to high temperatures
