Carriage Bolts

carriage bolt, also known as a coach bolt or round head square neck bolt, is a type of threaded fastener designed for applications where a smooth and finished appearance is desired on the exposed side. Carriage bolts feature a round head with a flat top and a square or rectangular neck below the head. Here is a description of a carriage bolt in English:

A carriage bolt, commonly referred to as a coach bolt or round head square neck bolt, is a type of threaded fastener specifically designed for applications where a clean and finished appearance is desired on the exposed side. Carriage bolts have a distinctive round head with a flat top and a square or rectangular neck just below the head.

The round head of a carriage bolt typically has a smooth, domed shape with no external drive mechanism, such as a hex or slotted head. This design allows the bolt to sit flush or slightly countersunk into the surface when installed, providing an aesthetically pleasing finish.

The square or rectangular neck of a carriage bolt is designed to fit into a corresponding square or rectangular hole in the material being fastened. The square neck prevents the bolt from rotating during installation, making it easier to tighten the accompanying nut from the opposite side.

Carriage bolts are commonly used in woodworking, construction, and other applications where a secure and visually appealing connection is required. They are often used to fasten materials such as wood, where the exposed side needs to be free of protruding bolt heads and where a smooth finish is desired.

When installing a carriage bolt, a hole is typically drilled through the material to be fastened. The square or rectangular hole on the opposite side is then created to accommodate the bolt's neck. The carriage bolt is inserted through the hole, and a nut is tightened onto the threaded end to secure the materials together.

Carriage bolts are available in various sizes, materials, and finishes to suit different applications and environmental conditions. Common materials include steel, stainless steel, and brass, while finishes can range from plain zinc plating to galvanized or coated options to enhance corrosion resistance.

In summary, a carriage bolt, also known as a coach bolt or round head square neck bolt, is a threaded fastener designed for applications where a clean and finished appearance is desired on the exposed side. With its round head and square or rectangular neck, it provides a secure and aesthetically pleasing connection in woodworking, construction, and other applications where a smooth finish is essential.