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Galvanized DIN 6921 Hexagon Flange Bolts - China Suppliers Factory for High Strength Connections
| Thread specifications d |
M5 | M6 | M8 | M10 | M12 | M14 | M16 | M20 | ||
| P | Pitch | Coarse teeth | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 |
| Fine Teeth 1 | / | / | 1 | 1.25 | 1.5 | 1.5 | 1.5 | 1.5 | ||
| Fine Teeth 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 | Type A | Max | 5.7 | 6.8 | 9.2 | 11.2 | 13.7 | 15.7 | 17.7 | 22.4 |
| Type 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=Public | 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 | ||
| Thread length b | - | - | - | - | - | - | - | - | ||
|
1. e Min. = 1.12 x S Min. 2. Material: a) Steel, strength class (material): 8.8, 10.9, 12.9 — DIN ISO 898-1 b) Stainless steel, strength class (material): A2-70 — DIN 267-11 |
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Key Functions of Flange Hexagonal Bolts
- 🔗 Stable Connection: The flange hexagonal bolt has a large tightening force, which can firmly connect the flange and the connected components, ensuring the stability of the connection.
- ⚙️ Power Transmission: It can not only transmit fastening force, but also transmit the power required by machines, equipment, etc.
- 🛡️ Ensure Sealing: The use of flange hexagonal bolts can isolate the connection from external media and ensure the sealing of the device.
- 💪 Higher Preload Force Capacity: Due to its "support area to stress area ratio" being greater than that of ordinary bolts, flange hexagonal bolts can withstand higher preload force and have better anti-loosening performance.
Frequently Asked Questions
What is a DIN 6921 flange hexagon bolt?
A DIN 6921 flange hexagon bolt is a standardized fastener featuring an integrated flange beneath the bolt head. The flange acts as a built-in washer, distributing the clamping load over a larger surface area and improving the stability and reliability of the connection.
What thread sizes are available for DIN 6921 flange bolts?
DIN 6921 flange hexagon bolts are available in a range of metric thread sizes including M5, M6, M8, M10, M12, M14, M16, and M20, with both coarse and fine thread pitch options depending on the application.
What materials are DIN 6921 flange bolts made from?
These bolts are manufactured in steel with strength classes 8.8, 10.9, and 12.9 per DIN ISO 898-1, as well as stainless steel with strength class A2-70 per DIN 267-11. Galvanized versions are also available for enhanced corrosion resistance.
What is the advantage of galvanized flange hexagon bolts?
Galvanizing provides a zinc coating that protects the steel bolt from rust and corrosion, making galvanized DIN 6921 flange bolts ideal for outdoor, marine, or high-humidity environments where long-term durability is required.
How do flange hexagon bolts differ from standard hexagon bolts?
Unlike standard hexagon bolts that require a separate washer, flange hexagon bolts have an integrated flanged bearing surface under the head. This increases the support area-to-stress area ratio, enabling a higher preload force and better resistance to loosening under vibration.
What industries commonly use DIN 6921 flange hexagon bolts?
DIN 6921 flange hexagon bolts are widely used in automotive manufacturing, machinery assembly, structural steel construction, pipeline systems, and industrial equipment where secure, vibration-resistant fastening and reliable sealing are essential.