Product Description:
DIN6921 Hexagon Head Flange bolt is a type of hexagon head bolt
with a built-in flange. This design combines the easy operation
characteristics of hexagon bolts with the anti-slip fastening
advantages of flange structures. The bolt can achieve stable
connections without the need for additional gaskets.
Features:
Core Structure
The bolt head is a standard hexagonal shape, compatible with tools
such as wrenches, making it easy to quickly tighten and
disassemble. The lower part of the head is integrally formed with a
ring-shaped flange surface, some of which have anti slip serrations
to enhance the locking effect. The rod is designed with full or
half threads according to the connection requirements to ensure
effective engagement with the nut.
Other standards: German DIN 931/933, American ANSI B18.2.1, etc.
Core Strengths
1. Increase the contact area of the flange surface to evenly
distribute pressure and reduce damage to the surface of the
connecting parts.
2. The serrated flange surface can produce mechanical locking
effect, and its anti-vibration and anti-loosening effect far
exceeds that of ordinary bolts, making it suitable for dynamic
working conditions.
3. The integrated flange design eliminates the step of separately
installing gaskets, simplifies the assembly process, and improves
construction efficiency.
Technical Parameters:
| Screw Thread | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M20 |
| P | Pitch | Coarse thread | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 |
| Fine thread-1 | / | / | 1 | 1.25 | 1.5 | 1.5 | 1.5 | 1.5 |
| Fine thread-2 | / | / | / | 1 | 1.25 | / | / | / |
| b | L≤125 | 16 | 18 | 22 | 26 | 30 | 34 | 38 | 46 |
| 125＜L≤200 | / | / | 28 | 32 | 36 | 40 | 44 | 52 |
| L＞200 | / | / | / | / | / | / | 57 | 65 |
| c | min | 1 | 1.1 | 1.2 | 1.5 | 1.8 | 2.1 | 2.4 | 3 |
| da | Form A | max | 5.7 | 6.8 | 9.2 | 11.2 | 13.7 | 15.7 | 17.7 | 22.4 |
| Form B | max | 6.2 | 7.4 | 10 | 12.6 | 15.2 | 17.7 | 20.7 | 25.7 |
| dc | max | 11.8 | 14.2 | 18 | 22.3 | 26.6 | 30.5 | 35 | 43 |
| ds | max | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 20 |
| min | 4.82 | 5.82 | 7.78 | 9.78 | 11.73 | 13.73 | 15.73 | 19.67 |
| du | max | 5.5 | 6.6 | 9 | 11 | 13.5 | 15.5 | 17.5 | 22 |
| dw | min | 9.8 | 12.2 | 15.8 | 19.6 | 23.8 | 27.6 | 31.9 | 39.9 |
| e | min | 8.71 | 10.95 | 14.26 | 16.5 | 17.62 | 19.86 | 23.15 | 29.87 |
| f | max | 1.4 | 2 | 2 | 2 | 3 | 3 | 3 | 4 |
| k | max | 5.4 | 6.6 | 8.1 | 9.2 | 11.5 | 12.8 | 14.4 | 17.1 |
| k1 | min | 2 | 2.5 | 3.2 | 3.6 | 4.6 | 5.1 | 5.8 | 6.8 |
| r1 | min | 0.25 | 0.4 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | 0.8 |
| r2 | max | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | 0.9 | 1 | 1.2 |
| r3 | min | 0.1 | 0.1 | 0.15 | 0.2 | 0.25 | 0.3 | 0.35 | 0.4 |
| r4 | ≈ | 3 | 3.4 | 4.3 | 4.3 | 6.4 | 6.4 | 6.4 | 8.5 |
| s | max=nominal size | 8 | 10 | 13 | 15 | 16 | 18 | 21 | 27 |
| min | 7.78 | 9.78 | 12.73 | 14.73 | 15.73 | 17.73 | 20.67 | 26.67 |
| t | max | 0.15 | 0.2 | 0.25 | 0.3 | 0.35 | 0.45 | 0.5 | 0.65 |
| min | 0.05 | 0.05 | 0.1 | 0.15 | 0.15 | 0.2 | 0.25 | 0.3 |
Applications:
Typical application areas
Widely used in various industries, including automobiles,
machinery, construction, home appliances, and pipeline engineering.
For instance, it is utilized for securing automotive chassis and
engine components, as well as for linking the shell and bracket of
mechanical equipment. Additionally, it is employed for sealing and
fastening pipeline flanges, as well as for the internal structure
assembly of household appliances like washing machines and air
conditioners.
