Coach Bolts (Box)Product Information Coach Bolts are strong, durable fasteners commonly used in wood and timber construction. With a smooth, domed head and a square or hexagonal neck that prevents the bolt from turning when tightened, coach bolts provide a secure and stable fastening solution. Made from high quality steel, these bolts are designed to resist corrosion and are often used in outdoor or heavy duty applications such as decking, fencing, and furniture