What is the difference between a coach bolt and a coach screw?
A coach bolt, carriage bolt, or round head square neck bolt is a form of bolt used to fasten metal to 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. This makes the bolt self-locking when placed through a square hole in a metal strap, or a round hole in most wood. This allows the fastener to be installed with only a single tool, a spanner or wrench, working from one side. The head of a carriage bolt is usually a shallow dome. The squared section is of the same size as the diameter of the bolt shank, with a plain unthreaded shank.
Carriage bolts are extensively used in security fixings where the bolt must only be removable from one side. The smooth domed head prevents the coach bolt from being unlocked from the insecure side.