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Hot Dipped Galvanized Carriage Bolt: The carriage bolt has a round head with a square neck under the head, see photo below, and is made from low or medium carbon steel with a hot galvanized finish applied. The square neck is designed to keep the bolt from turning as a nut is tightened. Most commonly used for connecting wood structures, the carriage bolt does not typically need to have a tensile strength rating higher than Grade 2. Hot dipped galvanized carriage bolts provide anti-corrosive protection to the fastener, and is typically used with treated lumber installations. The length of a carriage bolt is determined by measuring from under the head of the bolt to the base of the threads.
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