What Are Carriage Bolts?

Carriage bolts, also known as coach bolts, are a type of threaded fastener commonly used in woodworking and metalworking applications. They are designed with a distinctive domed or rounded head and a square section directly beneath the head. This square section is designed to prevent the bolt from turning when it is being tightened, making carriage bolts ideal for applications where the bolt needs to remain stationary while the nut is being turned.

Key characteristics of carriage bolts include:

Head Shape: Carriage bolts have a rounded or domed head, often with a smooth, flat top. This design provides a decorative appearance when used in visible areas.

Square Neck: The square section beneath the head of the bolt is intended to fit into a corresponding square hole in the material being fastened. This prevents the bolt from rotating as the nut is tightened.

Threaded Shaft: The threaded portion of the bolt extends from the square neck to the end of the bolt. This threaded section allows a nut to be fastened onto the bolt to secure two pieces of material together.

Carriage bolts are commonly used in woodworking projects, such as furniture assembly, as well as in construction and structural applications where a strong, secure connection is needed. They are often used with a washer and a nut to create a tight joint. The square neck prevents the bolt from spinning in the hole, making installation easier, especially in situations where access to the back of the fastened material is limited.

To install a carriage bolt, a hole is typically drilled through the materials being joined, and the square neck of the bolt is inserted into the hole. Then, a washer is placed over the threaded end of the bolt, and a nut is threaded onto the bolt and tightened. As the nut is tightened, the square neck of the bolt pulls against the inside surface of the hole, preventing the bolt from turning.

Carriage bolts come in various sizes, materials, and finishes to suit different applications and aesthetic preferences. When selecting carriage bolts, consider factors such as the size of the bolt, the thickness of the materials being joined, and the load-bearing requirements of the connection.

Xinchi Fastener Company is a trustworthy fastener company, especially in furniture nuts. And we are the designated fastener supplier to“STAPLE”. As a trusted fastener supplier,  Xinchi Fastener Company can offer a wide range of high-quality fasteners, including T nuts, screws, bolts, rivets, washers, etc. If you want to know more about fasteners or want to wholesale fasteners, please feel free to contact us. And then our experienced and expert service team will reply to you as soon as possible.