Coach bolts, also known as carriage bolts, are a type of fastener designed for use with wood.
They have a domed or countersunk head and a square section underneath that prevents the bolt from turning when tightening a nut. Coach bolts are commonly used in applications where a smooth finish is desired on the surface being bolted, as the head of the bolt sits flush with the material. These bolts are often used in woodworking, construction, and other applications where a strong and secure connection is needed.
