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Galvanized DIN 6921 Flange Hexagon Bolts from China Suppliers - High Strength Factory Direct Connection Solutions
| 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
A flange hexagonal bolt is a fastener used to connect components, and its main functions include:
- 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 type of fastener standardized under the German DIN 6921 specification. It features an integrated flange beneath the bolt head that distributes the clamping load over a larger surface area, reducing the risk of loosening and eliminating the need for a separate washer.
Q2
What thread sizes are available for DIN 6921 flange hexagon 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 requirements.
Q3
What materials are used for galvanized DIN 6921 flange hexagon bolts?
These bolts are typically manufactured from steel (strength classes 8.8, 10.9, and 12.9 per DIN ISO 898-1) or stainless steel (strength class A2-70 per DIN 267-11). The galvanized finish provides additional corrosion resistance for use in outdoor or harsh environments.
Q4
What are the advantages of using flange hexagon bolts over standard hexagon bolts?
Flange hexagon bolts offer several advantages: they distribute clamping force over a wider area due to the integrated flange, provide better anti-loosening performance, can withstand higher preload forces thanks to a greater support area to stress area ratio, and remove the need for a separate washer, simplifying assembly.
Q5
What is the difference between Type A and Type B flange hexagon bolts in DIN 6921?
The distinction between Type A and Type B in DIN 6921 refers to the maximum diameter of the bolt shank transition (da). Type B has a slightly larger maximum da value compared to Type A across all thread sizes, which affects the bearing surface and fit in certain applications.
Q6
How does galvanizing improve the performance of DIN 6921 flange hexagon bolts?
Galvanizing applies a protective zinc coating to the surface of the bolt, significantly enhancing its corrosion resistance. This makes galvanized DIN 6921 flange hexagon bolts ideal for use in outdoor structures, construction, automotive, and industrial applications where exposure to moisture, chemicals, or extreme weather conditions is expected.