DIN 604 refers to a specific standard established by the Deutsches Institut für Normung (DIN), which is the German Institute for Standardization. This standard pertains to the specifications and dimensions of hexagon head bolts with a metric thread, ensuring uniformity and compatibility in various engineering and construction applications. The DIN 604 standard outlines critical parameters such as the bolt's diameter, length, and material properties, which are essential for ensuring the structural integrity and reliability of assemblies in mechanical and civil engineering projects. Adhering to this standard is crucial for manufacturers and engineers to maintain quality control and to facilitate the interchangeability of components across different applications and industries.