DIN 558 is a standard that specifies the dimensions and technical requirements for hexagon head screws with thread lengths up to 100 mm. This standard ensures that these screws have a consistent design and can be easily interchanged across different applications. The DIN 558 standard covers various aspects such as the thread size, pitch, length, and the dimensions of the hexagon head. By adhering to this standard, manufacturers can ensure that their hexagon head screws meet the necessary quality and compatibility criteria, providing users with reliable and standardized fastening solutions.