DIN 6921 refers to a specific standard set by the Deutsches Institut für Normung (DIN), which is the German national organization for standardization. This standard delineates the specifications for flange bolts, also known as hexagon flange bolts. These bolts are characterized by a hexagonal head and a flange just beneath the head, which acts as an integrated, non-spinning washer. This design feature distributes the clamping load over a larger area, providing a more secure and vibration-resistant fastening. The DIN 6921 standard specifies various attributes of these bolts, including dimensions, material, mechanical properties, and marking requirements. Compliance with this standard ensures that the bolts are suitable for a wide range of industrial applications, delivering reliability and performance by adhering to internationally recognized dimensions and qualities.

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