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Galvanized DIN 6921 Hex Flange Bolts - High Strength Fasteners from China Suppliers and Factory
| 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.
- 1 Power Transmission: It can not only transmit fastening force, but also transmit the power required by machines, equipment, etc.
- 2 Ensure Sealing: The use of flange hexagonal bolts can isolate the connection from external media and ensure the sealing of the device.
- 3 Higher Preload 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 (FAQ)
Q1
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, which improves connection stability and reduces the risk of loosening.
Q2
What materials are available for DIN 6921 flange hexagon bolts?
DIN 6921 flange hexagon bolts are available in two main material types: steel (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.
Q3
What thread sizes are available for DIN 6921 flange hexagon bolts?
DIN 6921 flange hexagon bolts are available in thread sizes ranging from M5 to M20, including M5, M6, M8, M10, M12, M14, M16, and M20. Both coarse thread and fine thread (Fine Teeth 1 and Fine Teeth 2) options are available depending on the size.
Q4
Why do flange hexagon bolts offer better anti-loosening performance?
Flange hexagon bolts have a higher "support area to stress area ratio" compared to ordinary bolts. This means the clamping force is distributed over a larger bearing surface, reducing surface pressure and significantly improving resistance to vibration-induced loosening.
Q5
What is the difference between Type A and Type B for the da dimension?
The da dimension refers to the maximum diameter of the unthreaded shank portion near the bolt head. Type A has a smaller maximum da value, while Type B has a slightly larger maximum da value. For example, for M5: Type A max is 5.7 mm and Type B max is 6.2 mm. The choice depends on the specific application and tolerance requirements.
Q6
What are the typical applications of galvanized DIN 6921 flange hexagon bolts?
Galvanized DIN 6921 flange hexagon bolts are widely used in automotive manufacturing, machinery assembly, structural steel connections, pipelines, and outdoor construction applications where corrosion resistance is required. The galvanized coating provides excellent protection against rust and oxidation in harsh environments.