DIN 558 is a standard that specifies the dimensions and technical requirements for hexagon head screws with thread lengths up to 10 times the nominal diameter. This standard ensures that these screws have the necessary strength and durability for various applications. It provides detailed guidelines for the thread size, pitch, length, and other important dimensions, ensuring compatibility and interchangeability between different manufacturers. By adhering to DIN 558, manufacturers can produce high-quality hexagon head screws that meet the industry standards and provide reliable fastening solutions for a wide range of industries and applications.