The end of the bolt is threaded to accommodate the nut, while the shank fits within the wood. The square neck fits with square holes and notches that are cut into ironwork, which prevents the bolt from turning after it’s tightened in place. One of the most notable features of the carriage bolt is its square neck, which is positioned directly below the head and before the unthreaded portion of the shaft-also called the shank. It also prevents the bolt from being manipulated from the exterior. In addition to creating a smooth, unobtrusive profile, the head shape helps to broaden the bearing surface and eliminates the need for a washer. Today, they are applied to many wood-based structures that have metal hardware.Ĭarriage bolts have a dome or mushroom-shaped head. They derive their names from their use on the frames of carriages. The following information will explain their uses and features and clarify what makes each bolt distinct for specific structural needs.Ĭarriage bolts, which are also called coach bolts, can be used in some metal-to-metal connections, but they are mainly used to fasten metal parts to wood. There is, however, some overlap, which is shown in bolts that are designed to work with wood.įasteners like timber bolts, plough bolts, and carriage bolts have special features that make them uniquely suited to installation in wood. Those heavier structural materials are more commonly associated with fasteners like bolts and anchors. Such options work reliably in wood, as it’s a relatively soft material compared to concrete, steel, iron, and brick. In wood-to-wood connections, nails and screws are some of the most common types of fasteners that hold a structure together.
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