Release time：2020-01-16 18:44 Browse：
1. **Standard Adherence** - Comply with DIN 6921, a well - established German industrial standard. This standard precisely dictates the geometry, dimensional tolerances, and performance requirements of the bolts, ensuring interchangeability and compatibility with other components in various mechanical systems across industries. 2. **High - Strength Classification** - Rated as 10.9 grade, these bolts meet stringent mechanical property criteria. The "10" indicates a minimum tensile strength of 1000 MPa, while the "9" signifies that the yield strength is 90% of the tensile strength (i.e., 900 MPa). This high - strength rating makes them suitable for applications that involve heavy loads, vibrations, and high stress, such as in construction machinery, automotive engines, and industrial equipment. 3. **Precise Size and Thread Details** - With an M8 nominal diameter, these bolts are a commonly used size in medium - scale mechanical assemblies. The thread pitch is standardized according to DIN 6921, ensuring consistent engagement with mating nuts or threaded holes. The length of the bolt, also specified by the standard, can vary to accommodate different thicknesses of materials being fastened. 4. **Unique Head Design** - Feature a hexagon flange head, which combines the functionality of a traditional hex head with an integrated flange. The hex head allows for easy tightening and loosening using standard wrenches or sockets, providing high torque - transmission capabilities. The flange, on the other hand, has a larger surface area in contact with the fastened material. This helps distribute the load more evenly, reducing the risk of surface damage and enhancing the anti - loosening performance, especially in applications subject to vibrations. 5. **Surface Treatment Benefits** - Treated with black oxide coating, a process that forms a thin, protective layer on the surface of the bolts. This coating offers several advantages: it provides moderate corrosion resistance, protecting the bolts from rust and oxidation in normal environmental conditions. Additionally, the black oxide finish gives the bolts a non - reflective, low - profile appearance, which can be aesthetically desirable in some applications. The coating also has a slightly lubricious surface, making it easier to install the bolts by reducing friction during threading. 6. **Thread Quality and Fit** - The threads of these bolts are manufactured to high precision, conforming to the strict standards of DIN 6921. This ensures a proper fit with mating components, minimizing the risk of cross - threading during installation. The accurate thread profile also contributes to the overall strength and reliability of the bolted joint, as it allows for optimal force transfer between the bolt and the fastened materials. 7. **Assembly and Installation Advantages** - Due to their design and standardized dimensions, these bolts are straightforward to install. The hexagon flange head allows for quick and easy alignment with the fastening location. The integrated flange eliminates the need for separate washers in many cases, streamlining the assembly process and reducing component costs. This makes them a popular choice for both manual and automated assembly operations. 8. **Material Composition and Durability** - Typically made from high - quality alloy steels, carefully selected to achieve the desired 10.9 - grade strength characteristics. The alloy composition, along with proper heat treatment processes, ensures that the bolts have excellent mechanical properties, including high fatigue resistance. This durability allows the bolts to withstand repeated loading and unloading cycles without failure, extending the service life of the assembled structures. 9. **Industry - Wide Applications** - Widely used across multiple industries. In the automotive sector, they are employed in engine assemblies, chassis components, and suspension systems. In construction, they are used for structural connections in buildings and heavy equipment. Industrial machinery, such as pumps, compressors, and conveyor systems, also rely on these bolts for secure and reliable fastening. Their versatility makes them an essential component in modern manufacturing and engineering. 10. **Quality Control and Assurance** - Manufactured with strict quality control measures in place to ensure compliance with DIN 6921. This includes rigorous testing of mechanical properties, dimensional accuracy, and surface finish. Each bolt undergoes inspection at various stages of production, from raw material sourcing to the final finished product. This commitment to quality assurance guarantees that users receive consistent, reliable products that meet or exceed industry standards.
