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Galvanized DIN 6921 Hex Flange Bolts from China Suppliers - Reliable 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 × 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
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Provide 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.
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Power Transmission It can not only transmit fastening force, but also transmit the power required by machines, equipment, etc.
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Ensure Sealing The use of flange hexagonal bolts can isolate the connection from external media and ensure the sealing of the device.
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Capable of Withstanding Higher Preload Force 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 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 under vibration.
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, with both coarse and fine thread pitch options depending on the size.
Q
What materials and strength classes are these bolts available in?
DIN 6921 flange 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 in strength class A2-70 per DIN 267-11. Galvanized versions are also available for enhanced corrosion resistance.
Q
Why do flange hexagonal bolts offer better anti-loosening performance?
Flange hexagonal bolts have a higher "support area to stress area ratio" compared to standard hex bolts. This means the clamping force is distributed over a wider surface, reducing pressure concentration and providing superior resistance to loosening caused by vibration or dynamic loads.
Q
What are the typical applications of DIN 6921 flange bolts?
These bolts are widely used in automotive, machinery, construction, and industrial equipment where secure and sealed connections are required. Their integrated flange makes them ideal for applications where a separate washer cannot be used or where vibration resistance is critical.
Q
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 transition zone. Type A has a smaller maximum da value, indicating a tighter transition, while Type B allows a slightly larger maximum da value. The choice depends on the specific application requirements and tolerance class needed for the joint.