DIN 6921 Flange Bolts Manufacturer High Quality China Factory Suppliers
DIN 6921 Flange Bolts Manufacturer High Quality China Factory Suppliers
DIN 6921 Flange Bolts are high-performance industrial fasteners engineered with an integral circular flange that acts as a built-in washer. This specialized design distributes clamping force over a significantly larger surface area, reducing surface pressure and preventing pull-through in softer materials, making them an essential component for heavy-duty mechanical assemblies.
Manufactured to rigorous international standards including ISO 4162 and ANSI B18.2.1, these bolts are available in various grades of carbon steel and stainless steel to meet diverse environmental challenges. From high-pressure piping systems in oil and gas to precision automotive chassis assembly, DIN 6921 bolts ensure unmatched stability and structural integrity.
Detailed Parameters
| Standard Compliance | DIN 6921 (Serrated), ISO 4162 (Flat), ANSI B18.2.1 | Thread Range | M6 - M36 / UNC/UNF #4 - 1½" |
|---|---|---|---|
| Flange Diameter | 1.7×d to 2.5×d (e.g., M10: Φ17-25mm) | Serration Angle | 30° (DIN) / 45° (ANSI) |
| Tooth Depth | 0.4mm - 0.8mm (Depending on flange size) | Carbon Steel Grade | 8.8 (800MPa) / 10.9 (1040MPa) |
| Stainless Steel Grade | A2-70 (700MPa) / A4-80 (800MPa) | Surface Treatment | Electro-Zinc Plated (ASTM B633) |
| Operating Temp | CS: -50℃ to +250℃ / SS: -200℃ to +400℃ | Torque Example | M10 Grade 10.9: 85Nm (lubricated) |
Key Advantages
Enhanced Load Distribution
The integrated flange eliminates the need for separate washers and spreads clamping force to prevent material deformation.
Rapid Installation
Reduced part count streamlines the assembly process, significantly lowering labor time and installation errors.
Vibration Resistance
Serrated flange options provide superior grip, preventing loosening in high-vibration industrial environments.
Extreme Temperature Range
Capable of operating from -200℃ up to +400℃ depending on the chosen material grade.
Corrosion Protection
Electro-zinc plating and stainless steel options ensure longevity in humid or chemically aggressive settings.
Global Standardization
Full compliance with DIN, ISO, and ANSI standards ensures seamless global interchangeability.
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Optimized Value
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Investment Return Comparison
| Comparison Metric | Standard Bolt + Washer | DIN 6921 Flange Bolt | Business Impact |
|---|---|---|---|
| Assembly Speed | Slow (2 parts) | Fast (1 part) | 30% Labor Reduction |
| Part Inventory | High (Bolt & Washer) | Low (Single SKU) | Reduced Storage Costs |
| Clamping Stability | Standard | Superior (Flange) | Less Frequent Maintenance |
| Risk of Loss | Higher (Washer slip) | Minimal | Increased Safety/Reliability |
| Total Cost/Unit | Medium | Optimized | Lower Total Cost of Ownership |
Frequently Asked Questions
The primary difference is the integrated circular flange under the head, which distributes clamping force over a wider area and eliminates the need for a separate washer.
Serrated flanges are ideal for applications subject to high vibration, as the teeth "bite" into the surface to prevent the bolt from loosening over time.
For corrosive environments, we recommend Stainless Steel A4-80, which offers superior resistance to acids and chlorides compared to A2 or carbon steel.
Yes, they are designed to meet ISO 4162 and ANSI B18.2.1, making them suitable for automotive chassis, manifolds, and engine components.
The flange diameter (ranging from 1.7x to 2.5x the thread diameter) increases the bearing surface, effectively reducing the pressure (psi) applied to the joint.
Absolutely. They are widely used in flanged pipe connections for oil, gas, and water treatment systems due to their high clamping force and stability.
