DIN 6921 refers to a specific standard for hexagon flange bolts, which are characterized by their unique design that incorporates a flanged head. This type of bolt is widely utilized in various engineering and construction applications due to its ability to distribute load over a larger surface area, thereby enhancing the joint's stability and strength. The standard outlines the dimensions, mechanical properties, and material specifications necessary to ensure the reliability and performance of these fasteners in demanding environments. Hexagon flange bolts are particularly favored in situati