The DIN 7504 standard series encompasses various types of thread-forming screws. Specifically, refers to the "wide thread" ( flachgewinde ) variant designed to optimize performance in thermoplastic materials.
The "K" designation specifically refers to the (also known as a flange). This design provides a larger bearing surface, which helps distribute the clamping force and prevents the screw head from sinking into or damaging thin materials. Key Specifications din 7504 k standard pdf
