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Other than historical accuracy, why would threaded rod be "frowned upon?"Will the stud police show up with a search warrant?"Sir, keep your hands where we can see them and remove that cylinder head."
I hate it when you buy a bolt and it is threaded the entire length of its shank. Where did these people come from? A bolt should only be threaded for 2 1/2 times the diameter of the bolt, the plain part of the shank is there for a good reason
I think most people buy the screws and cut them to the length required which if it were a bolt may remove too much thread.