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China Suppliers Factory Galvanized DIN 6921 Hexagon Flange Bolts for Industrial and Structural Applications
📐 DIN 6921 Flange Hexagon Bolt — Dimensional Specifications
| 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 | - | - | - | - | - | - | - | - | ||
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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:
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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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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 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 providing a more secure and stable connection compared to standard hex bolts.
Q
What materials are available for DIN 6921 flange hexagon bolts?
DIN 6921 flange hexagon bolts are available in two primary materials: 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.
Q
What thread sizes does the DIN 6921 flange bolt cover?
DIN 6921 flange hexagon bolts are available in metric thread sizes ranging from M5 to M20, including M5, M6, M8, M10, M12, M14, M16, and M20. Both coarse and fine thread pitches are supported depending on the size.
Q
What are the advantages of flange hexagon bolts over standard hex bolts?
Flange hexagon bolts offer several advantages: they eliminate the need for a separate washer, provide a larger bearing surface that reduces surface pressure, offer 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 is the difference between Type A and Type B flange hexagon bolts?
The difference between Type A and Type B refers to the maximum dimension of the thread run-out diameter (da). Type B has a slightly larger da max value compared to Type A, which affects the thread transition zone. The appropriate type should be selected based on application requirements and mating component tolerances.
Q
What applications are DIN 6921 flange hexagon bolts commonly used in?
DIN 6921 flange hexagon bolts are widely used in automotive manufacturing, machinery assembly, structural steel connections, pipe flange joints, and industrial equipment. Their enhanced sealing capability and anti-loosening properties make them ideal for applications subject to vibration or dynamic loads.