Product Description
The DIN 251 hex socket flange bolt is an upgraded fastener based on the standard DIN 912 hex socket bolt, featuring a circular flange integrated beneath the head. It offers built-in anti-loosening, anti-slip, and load-distribution capabilities. Compared to standard bolts, the serrated flange grips the workpiece surface, providing superior vibration resistance and anti-loosening performance.
Basic Product Information
- Product Name: DIN 251 Hexagon Socket Head Cylinder Flange Bolt (Anti-Slip Flange Bolt)
- Standard: DIN 251 (German Standard)
- Common Strength Grades:
Carbon Steel: Grade 4.8 / Grade 8.8 / Grade 10.9 / Grade 12.9
Stainless Steel: A2-70 / A4-70 / A4-80
- Material:
Carbon Steel: 10B21 / 35# / SCM435
Stainless Steel: SUS304 / SUS316
- Surface Treatment:
Carbon Steel: Blue-white zinc / Color-coated zinc / Black zinc / Blackening / Dacromet
Stainless Steel: Natural finish / Passivated
- Thread Standard: Metric coarse thread M series (primarily full-threaded)
- Flange Face: Serrated / Smooth
Key Product Features
The head features an integrated flange (washer), eliminating the need for additional shims or spring washers. This reduces the number of components, simplifies assembly, and improves efficiency.
The flange increases the contact area and distributes pressure. The serrated pattern on the bottom engages with the workpiece surface, providing vibration resistance and preventing loosening, making it ideal for high-vibration equipment.
The combination of a cylindrical hex socket and flange structure ensures stable torque and prevents slippage. The low-profile head is suitable for applications with limited space or where concealed installation is required.
High-strength carbon steel in grades 8.8, 10.9, and 12.9 meets heavy-duty requirements. 304/316 stainless steel is used for corrosion resistance, food, medical, and outdoor environments.
Manufactured strictly to DIN 251 dimensions, ensuring high interchangeability and compatibility with European or international equipment, making it a universal fastener.
DIN 251 Standard Dimensions (mm)
Key Parameters (Suitable for both toothed and smooth surfaces)
|
Thread diameter d |
Pitch P |
Head diameter dk |
Flange diameter dc |
Head height k |
Internal hexagon side length s |
Internal hexagon depth t (min) |
Number of flange teeth |
|
M4 |
0.7 |
7.0 |
9.0 |
4.0 |
3.0 |
2.0 |
18 |
|
M5 |
0.8 |
8.0 |
11.0 |
5.0 |
4.0 |
2.5 |
20 |
|
M6 |
1.0 |
10.0 |
12.6 |
6.0 |
5.0 |
3.0 |
24 |
|
M8 |
1.25 |
13.0 |
16.0 |
8.0 |
6.0 |
4.0 |
24 |
|
M10 |
1.5 |
16.0 |
20.0 |
10.0 |
8.0 |
5.0 |
30 |
|
M12 |
1.75 |
18.0 |
22.5 |
12.0 |
10.0 |
6.0 |
30 |
|
M14 |
2.0 |
21.0 |
26.0 |
14.0 |
12.0 |
7.0 |
39 |
|
M16 |
2.0 |
24.0 |
30.0 |
16.0 |
14.0 |
8.0 |
39 |
Standard Length Series (mm)
6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, 100, 120, 150
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