The thickness of the hexagonal head excluding the flange.
| Designation | Head Form | Key Characteristics | | :--- | :--- | :--- | | | Hexagon head with a flange (washer face) | Allows for high torque transmission, and the integrated flange distributes the load. | | DIN 7504 M | Pan head (cylindrical raised head) | Often features a cross recess (Phillips or Pozidriv) for general-purpose applications. | | DIN 7504 O | Countersunk flat head | Designed to sit flush with or below the material's surface for a smooth finish. | | DIN 7504 P | Pan head with a cross recess | A common general-purpose head style for light to medium-duty fastening. |
Facilitates high-torque driving using socket wrenches or magnetic hex drivers.
The outer diameter of the integrated washer/flange surface. din 7504 k standard pdf
The Deutsches Institut für Normung (DIN) established the DIN 7504 standard to regulate the mechanical properties, dimensions, tolerances, and functional performance of drilling screws.
Provides a larger bearing surface to distribute load, sometimes integrated with an EPDM washer for sealing applications. DIN 7504 K Technical Specifications and Dimensions
The updated international equivalent is ISO 15480 . The thickness of the hexagonal head excluding the flange
If you are in construction or heavy metal fabrication, you have likely encountered the term DIN 7504 K
The "K" profile is optimized to reduce hoop stress. If a standard sharp thread profile were used, the stress concentration factor ($K_t$) could exceed the fracture toughness of the plastic, leading to boss bursting. The DIN 7504 K profile distributes the radial force over a larger surface area, allowing the use of higher tightening torques without structural failure of the parent component.
Specifically, designates a self-drilling screw featuring a hexagon head with an assembled collar (flange) . What is the DIN 7504 K Standard? | | DIN 7504 O | Countersunk flat
The overall DIN 7504 standard covers several self-drilling screw head profiles. Each profile is designated by a specific letter: : Hexagon head with a built-in flange or collar. Form L : Recessed pan head. Form M : Recessed countersunk head. Form N : Modified pan head options.
Fixing metal sheets to structural steel purlins.
The standard specifies requirements for self-drilling tapping screws with a hexagon head and collar (flange) . These screws are designed to drill their own pilot hole and form their own mating threads in a single operation, eliminating the need for pre-drilling in materials like sheet metal or heavy profiles. Key Technical Specifications
The DIN 7504 K standard provides a comprehensive framework for self-tapping screws with hexagon heads and tapping screw threads. By understanding the key specifications and significance of this standard, manufacturers and engineers can select the right screws for their projects, ensuring reliable connections, interchangeability, and compliance with regulations.