DIN 6921 is a technical standard that specifies the requirements for hexagon flange bolts with reduced shank. These bolts are commonly used in automotive and mechanical engineering applications, where a reliable and robust fastening solution is required. The standard covers the dimensions, materials, and mechanical properties of the bolts, ensuring that they meet specific performance criteria. By providing a comprehensive set of guidelines, DIN 6921 enables manufacturers and engineers to produce and use these bolts with confidence, knowing that they will deliver the strength and durability needed for demanding applications.