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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
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
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
dc
Max
11.8
14.2
18
22.3
26.6
30.5
35
43
s
Max
8
10
13
15
16
18
21
27
1. e Min. = 1.12 x S Min.
2. Material: (a) Steel strength class 8.8, 10.9, 12.9 (DIN ISO 898-1); (b) Stainless steel A2-70 (DIN 267-11).
Key Functions of Flange Hexagonal Bolts
🔗
Stable Connection
Large tightening force ensures firm connection between the flange and components for maximum stability.
⚙️
Power Transmission
Transmits both fastening force and required mechanical power for high-performance equipment.
🔒
Ensure Sealing
Isolates the connection from external media, ensuring the integrity and sealing of the device.
💪
Higher Preload Capacity
Superior "support area to stress area ratio" allows for higher preload force and anti-loosening performance.
Frequently Asked Questions
QWhat is a DIN 6921 flange hexagon bolt?
A standardized fastener featuring an integrated flange beneath the head that acts as a built-in washer, distributing clamping load and resisting loosening.
QWhat materials are available for DIN 6921 bolts?
Mainly steel (strength classes 8.8, 10.9, 12.9) and stainless steel (A2-70). Galvanized versions are available for enhanced corrosion resistance.
QWhat thread sizes are available?
Standard sizes range from M5 to M20, with options for both coarse and fine threads depending on the diameter.
QWhat is the advantage over standard hexagon bolts?
They offer a higher support area ratio, allowing for higher preload forces and eliminating the need for separate washers.
QWhat does the galvanized treatment provide?
A protective zinc coating that significantly improves corrosion resistance, making them ideal for outdoor and industrial environments.
QHow is the thread length (b) determined?
It is based on the total bolt length (L) across three ranges: L ≤ 125mm, 125mm < L ≤ 200mm, and L > 200mm, as specified in the dimensional table.
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