In practice, it is normal for standard bolts from stock to be fully galvanized, but for nuts and lock nuts to be galvanized as blanks and then tapped up to 0.4 mm oversize with the threads then lightly oiled. When assembled, the nut and the locknuts thread is protected by contact with the coating on the bolt. Even after many years of service, galvanized nuts and locknuts can readily be unfastened even though the threads have never been galvanized. The hotdip coating provides excellent corrosion protection of 100% on the edges and the outer surface of the nut and locknuts.
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