DIN 6921 is a standard that lays out the specifications for hexagon flange bolts with an integral washer. These bolts are designed for use in high-stress and high-temperature applications, making them a critical component in various industries such as automotive, construction, and machinery. The standard provides detailed requirements for the dimensions, materials, and mechanical properties of these bolts, ensuring their reliability and performance in demanding conditions. By adhering to the specifications outlined in DIN 6921, manufacturers can produce bolts that meet the highest quality and safety standards, thus contributing to the overall durability and stability of the products and structures in which they are used.