The head of a carriage bolt is usually a shallow dome. This allows the fastener to be installed with only a single tool, a spanner or wrench, working from one side. This makes the bolt self-locking when placed through a square hole in a metal strap, or a round hole in most wood. It is distinguished from other bolts by its shallow mushroom head and that the shank cross-section of the bolt is circular for most of its length, as usual, but the portion immediately beneath the head is formed into a square section. A carriage bolt, coach bolt or round head square neck bolt is a form of bolt used to fasten metal to wood.
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