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:


Characteristics:
- 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.
Advantages:
- 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.
Application:
- 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 |
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