Carriage bolts DIN 603 are designed for use in wood-to-metal fastening applications and are characterized by their oval-shaped head and square neck, which helps to prevent the bolt from turning as the nut is tightened. These bolts are commonly used in construction and woodworking projects, thanks to their smooth, low-profile head that provides a clean finished appearance. The square neck also makes them easy to install and remove, as it helps to hold the bolt in place while the nut is tightened. Overall, carriage bolts DIN 603 are a reliable and versatile fastening solution for a wide range of applications.