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A carriage bolt, also known as a coach bolt, is a type of fastener that is widely used for applications where a smooth and finished appearance is desired on one side of the joint. It is characterized by its distinctive domed or rounded head and a square or ribbed shoulder directly beneath the head.

The head of a carriage bolt is typically larger and flatter than that of a standard hex bolt, providing a smooth surface and a finished appearance when installed. The square or ribbed shoulder beneath the head is designed to prevent the bolt from rotating during installation, providing added stability and security.

Carriage bolts are usually made from steel, stainless steel, or brass, offering strength and durability for a wide range of applications. They are available in various sizes, lengths, and diameters to accommodate different requirements.

One of the unique features of carriage bolts is that they are often used with a corresponding square hole in the material being fastened. This square hole prevents the bolt from spinning, making it easier to tighten the nut on the opposite side. This feature is particularly useful when working with wood or soft materials.

Carriage bolts are commonly used in woodworking, construction, and furniture assembly. They are often utilized in applications such as fastening wooden beams, attaching brackets, or securing metal or wooden components where a flush and aesthetically pleasing appearance is desired.

Overall, carriage bolts provide a secure and visually appealing fastening solution, making them popular for applications where both functionality and aesthetics matter.