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High-Strength Galvanized DIN 6921 Flange Hexagon Bolts - Quality China Suppliers & Factory for Industrial Applications
| 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
Q
What is a DIN 6921 flange hexagonal bolt?
A DIN 6921 flange hexagonal bolt is a type of fastener standardized under the German DIN 6921 specification. It features an integrated flange beneath the hexagonal head, which distributes the clamping load over a larger surface area, providing a more secure and stable connection compared to standard hex bolts.
Q
What materials are available for DIN 6921 flange bolts?
DIN 6921 flange hexagonal bolts are available in two main material types: steel (with strength classes 8.8, 10.9, and 12.9 per DIN ISO 898-1) and stainless steel (strength class A2-70 per DIN 267-11). Galvanized versions are also available for enhanced corrosion resistance.
Q
What thread sizes are available for DIN 6921 flange bolts?
DIN 6921 flange hexagonal bolts are available in a range of metric thread sizes including M5, M6, M8, M10, M12, M14, M16, and M20. Both coarse thread and fine thread options are available depending on the application requirements.
Q
What is the advantage of using a flange hexagonal bolt over a standard hex bolt?
Flange hexagonal bolts offer several advantages: they eliminate the need for a separate washer, distribute clamping force over a larger area, provide better anti-loosening performance due to a higher support area to stress area ratio, and can withstand higher preload forces than standard hex bolts.
Q
What does the galvanized coating on DIN 6921 bolts provide?
The galvanized coating on DIN 6921 flange hexagonal bolts provides a protective zinc layer that significantly enhances corrosion resistance. This makes them suitable for outdoor, marine, and other harsh environments where exposure to moisture and corrosive elements is a concern.
Q
What are the typical applications of DIN 6921 flange hexagonal bolts?
DIN 6921 flange hexagonal bolts are widely used in automotive assemblies, machinery manufacturing, pipeline flange connections, structural steel fabrication, and general industrial equipment where a reliable, high-strength, and vibration-resistant fastening solution is required.