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China Suppliers Factory Galvanized DIN 6921 Hex Flange Bolts for Strong Industrial Connections
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China Suppliers Factory Galvanized DIN 6921 Hex Flange Bolts for Strong Industrial Connections
China Suppliers Factory Galvanized DIN 6921 Hex Flange Bolts for Strong Industrial Connections
China Suppliers Factory Galvanized DIN 6921 Hex Flange Bolts for Strong Industrial Connections
China Suppliers Factory Galvanized DIN 6921 Hex Flange Bolts for Strong Industrial Connections
China Suppliers Factory Galvanized DIN 6921 Hex Flange Bolts for Strong Industrial Connections
China Suppliers Factory Galvanized DIN 6921 Hex Flange Bolts for Strong Industrial Connections
China Suppliers Factory Galvanized DIN 6921 Hex Flange Bolts for Strong Industrial Connections
China Suppliers Factory Galvanized DIN 6921 Hex Flange Bolts for Strong Industrial Connections

China Suppliers Factory Galvanized DIN 6921 Hex Flange Bolts for Strong Industrial Connections

Hexagonal flange bolts are essential components widely utilized for connecting various structures and machinery that demand enhanced strength and stability. These bolts are perfect for applications in mechanical equipment, automotive parts, and building infrastructure. Designed with a hexagonal head, they are easily tightened or loosened using a wrench, making them ideal for projects that require frequent assembly and disassembly. As a leading manufacturer in China, our factory produces high-quality hexagonal flange bolts tailored to meet diverse industrial applications and structural connection needs. Partner with trusted suppliers to ensure you have reliable fastening solutions for your projects
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    Galvanized din 6921 flange hexagon bolts
    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 - - - - - - - -
    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
    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 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 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 superior resistance to loosening compared to standard hexagon bolts.
    Q What materials are available for DIN 6921 flange hexagon bolts?
    A DIN 6921 flange hexagon bolts are available in two main materials: (a) steel with strength classes 8.8, 10.9, and 12.9 per DIN ISO 898-1, and (b) stainless steel with 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 hexagon bolts?
    A 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 options are available depending on the size.
    Q What is the advantage of using a flange hexagon bolt over a standard hexagon bolt?
    A Flange hexagon bolts offer a higher "support area to stress area ratio" compared to standard hexagon bolts. This allows them to withstand higher preload forces, provide better anti-loosening performance, ensure a more stable connection, and eliminate the need for a separate washer in most applications.
    Q What does the galvanized surface treatment provide for DIN 6921 bolts?
    A Galvanizing provides a protective zinc coating on the surface of DIN 6921 flange hexagon bolts, significantly enhancing their corrosion resistance. This makes galvanized bolts ideal for outdoor, marine, or industrial environments where exposure to moisture, chemicals, or harsh weather conditions is a concern.
    Q How is the thread length (b) determined for DIN 6921 flange hexagon bolts?
    A The thread length (b) for DIN 6921 flange hexagon bolts is determined based on the total bolt length (L) and the thread diameter. Three ranges apply: for L ≤ 125mm, for 125mm < L ≤ 200mm, and for L > 200mm. Each range has specific thread length values defined in the dimensional specification table above.