DIN 7990 specifies the technical requirements for high-strength hexagon head bolts with large widths across flats and reduced shank. These bolts are designed for use in steel structures and are capable of carrying heavy loads. The standard covers dimensions, materials, mechanical properties, and markings for these bolts. By providing clear guidelines for the production and use of these specialized fasteners, DIN 7990 ensures the safety and reliability of steel structures in various industries such as construction, automotive, and machinery. The standard plays a crucial role in facilitating the interchangeability and compatibility of these bolts, making it an essential reference for manufacturers, engineers, and professionals working with heavy-duty steel assemblies.