DIN 6921 Bolts

DIN 6921 Bolts

DIN Standards are invented for a variety of components including industrial fasteners as DIN 6921 Hex Flange Bolts. DIN 6921 Flange Bolts are manufactured from stainless austenitic steels of a2 grade and a4 (acid-resistant), also made of different materials including carbon steel, stainless steel and non-ferrous metals. DIN 6921 Bolts are available in a wide range of sizes, shapes and materials.

Following are the specification of DIN 6921 Bolts:

din 6921
din 6921 bolts


  • DIN 6921 Bolts are available with a flat flange or a flange with locking teeth.
  • Flange can be made with incisions or without incisions.
  • Consist of a rod with full or incomplete metric thread and a hexagon head with a flange on the side of the rod.
  • Complies with ISO 8102 International Standard, EN 1665, EN 14219.
  • Strength Class 5.8, 8.8 and 10.9.
  • The Bolt is installed in the mounting hole, where the nut is tightened from the reverse side.


  • The presence of threads helps to prevent the bolts from loosening when exposed to vibration due to high frictional force between the flange and the attachment element.
  • A smooth flange increases the area of the clamping surface of elements.
  • Ensure the durability and strength of detachable threaded connections.
  • Provide reliable protection against unscrewing operations.


  • Used together with nuts and washers to connect and fasten parts and structures.
  • Used for mounting, joining, fixing structural elements and equipment together with nuts of appropriate thread size.
  • Capable of safely withstanding a great tightening force.
  • Recommended to create detachable connections in engineering, construction, instrumentation and in other industries.
  • Used for assembly works of complex and simple mechanisms, structure, pipelines and sanitary devices.

Dimension specification of DIN 6921 Bolts

Dimension M5 M6 M8 M10 M12 M16
k 5.4 6.6 8.1 9.2 11.5 14.4
s 8 10 13 15 16 21
dc 11.58 14.2 18 22.3 26.6 35
b1) 16 18 22 26 30 38
b2) 28 32 36 44
b3) 57
We manufacture DIN 6921 Bolts as per Custom Specification and export in Germany, Spain, Netherlands, Portugal, UK and other European Countries. For more Information, Please Contact Us or Inquiry Now.