DIN 6921 refers to a specific standard established by the Deutsches Institut für Normung (DIN), which outlines the requirements and specifications for hexagon head screws with a flange and a metric thread. This standard is crucial for ensuring the quality and reliability of fasteners used in various engineering and construction applications. The DIN 6921 standard provides detailed information regarding the dimensions, mechanical properties, and material specifications necessary for the production of these screws, thereby facilitating compatibility and interchangeability in assembly processes. Adhering to this standard is essential for manufacturers and engineers to ensure that the components meet the necessary safety and performance criteria in their respective applications.