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Zinc Plated 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.  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.  The zinc plating on the bolt helps to slow down the process of rust formation but is not anti-corrosive.  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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