Carriage Bolts

A carriage bolt features a wide domed head, a square neck, and a partially threaded blunt shank meant to connect metal to wood or wood to other wood. Even though it features threads, the fastener is not screwed into the mating surface because the head is smooth and does not feature a drive style. The bolt is pushed into a pre-drilled hole in wood (with the aid of a hammer if necessary) with a washer just beneath the head and is secured on the other end with a nut. The threads allow the shank to grip into the wood or metal for extra stability.