What is the difference between a carriage bolt and a coach bolt?

There are significant differences in design and use between a carriage bolt and a coach bolt.

In terms of design, a carriage bolt usually has a rounded head with a flat or slightly raised portion, which allows it to fit snugly on the surface of the material, prevent loosening, and is easy to install and remove. A coach bolt, also known as a square head bolt, has a more square head design, which may provide additional stability in some specific application scenarios, especially when it is necessary to prevent the bolt from rotating.

In terms of use, a carriage bolt is widely used in wood structure construction, furniture making, and metal structures that require stable connections due to its stability and ease of use. A coach bolt may be used in some specific industrial or mechanical fields, especially in situations where high-strength connections or special fastening requirements are required.

Although both carriage bolts and coach bolts are common connection elements, they have their own characteristics in design and use and are suitable for different application scenarios. When choosing, you need to make comprehensive considerations based on specific needs and usage environment.