Carriage bolts DIN 603, also known as coach bolts, are a type of fastener commonly used in woodworking and metal joining applications. These bolts have a square neck beneath a rounded head, which prevents them from turning when tightening the nut. The smooth, domed head gives a finished look to the assembly and provides a safer and more attractive finish compared to other types of bolts. Carriage bolts DIN 603 are typically made from steel with a zinc finish for corrosion resistance, making them suitable for outdoor applications as well. These bolts are easy to install and are commonly used in construction, furniture assembly, and other projects that require a secure and neat-looking fastening solution.