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Discover the superior fastening performance of our DIN 6921 Black Hex Flange Head Bolts, engineered for applications where security and vibration resistance are paramount. These high-quality fasteners are distinguished by a hexagonal head integrated with a wide, circular flange, a design that effectively eliminates the need for a separate washer. This one-piece construction streamlines the assembly process, reduces component inventory, and ensures a more reliable joint. Manufactured from robust carbon steel and finished with a durable black oxide coating, these bolts provide a secure grip and excellent load distribution. The integral flange creates a larger contact area, which significantly increases resistance to loosening caused by dynamic loads, shock, and vibration. Adhering strictly to the DIN 6921 standard, our flange bolts guarantee dimensional consistency and dependable performance, making them an essential component for demanding industrial, automotive, and mechanical assemblies where fastener integrity cannot be compromised.
Our DIN 6921 Black Hex Flange Head Bolts are forged from premium-grade carbon steel, offering exceptional strength and durability for critical fastening tasks. They are available in a range of property classes, including high-tensile grades 8.8, 10.9, and 12.9, to meet the specific load requirements of your project. The defining feature is the black oxide coating, a conversion finish that is chemically bonded to the steel’s surface. This treatment provides moderate corrosion resistance, ideal for indoor or dry environments, while also minimizing light reflection and preventing galling during installation. The integral flange can be specified with a smooth bearing surface to protect delicate finishes or with serrations for maximum locking power. The serrated option features sharp teeth that bite into the mating surface upon tightening, creating a mechanical lock that offers unparalleled resistance to rotational loosening, making these bolts a top choice for high-vibration environments.
The technical specifications for our DIN 6921 Black Hex Flange Head Bolts are outlined below, ensuring you can select the precise fastener for your application.
| Parameter | Specification |
|---|---|
| Product Name | DIN 6921 Hexagon Flange Bolt |
| Standard | DIN 6921 |
| Material | Carbon Steel |
| Property Class / Grade | 4.8, 8.8, 10.9, 12.9 |
| Surface Treatment | Black Oxide Coated |
| Diameter Range | M4 – M24 |
| Measurement System | Metric |
| Brand Name | Duojia |
| Place of Origin | Hebei, China |
| Key Feature | Integrated Flange for Vibration Resistance |
| Application | Heavy Industry, General Industry, Automotive |
Our DIN 6921 flange bolts are engineered with several key features to deliver optimal performance and reliability. The primary advantage is the Integrated Flange Design, which acts as a built-in washer to distribute the clamping load over a wider surface area, reducing stress on the assembly materials and preventing damage. This one-piece construction simplifies and accelerates installation by eliminating the handling of separate washers. A key feature is their exceptional Vibration Resistance, especially when specified with a serrated flange, which creates a powerful mechanical lock against the mating surface. Manufactured from High-Strength Carbon Steel in grades up to 12.9, these bolts provide the tensile strength required for the most demanding structural connections. The functional Black Oxide Finish offers good wear resistance, anti-galling properties, and a professional, non-reflective appearance. Finally, strict adherence to DIN 6921 Specifications ensures complete dimensional accuracy for universal compatibility and a perfect fit in any standardized assembly.
The unique combination of high strength, load distribution, and vibration resistance makes DIN 6921 Black Hex Flange Head Bolts indispensable across a multitude of industries. In the Automotive Sector, they are extensively used for securing critical components such as engine mounts, transmission housings, suspension parts, and chassis frames, where constant vibration demands a fastener that will not loosen over time. Within Heavy Machinery and Industrial Equipment, these bolts are trusted to assemble conveyor systems, hydraulic pumps, machine guards, and structural frames in manufacturing plants and on construction sites. Their reliability makes them ideal for Off-Road Vehicles and Agricultural Equipment, which endure significant shock and dynamic stress. Furthermore, they are a preferred choice in general engineering and assembly for securing motors, generators, and any application where maintaining clamp load and preventing rotational slippage is essential for safety and operational integrity.
