The standard specifies requirements for self-drilling tapping screws featuring a hexagon head with a flange (collar) . This specialized fastener is designed to drill its own pilot hole, tap its own thread, and secure the connection in a single operation, primarily in metal-to-metal applications. Key Technical Specifications
Keep in mind that standards are subject to periodic updates, so ensure you're accessing the latest version. din 7504 k standard pdf
Hole diameter ≈ Pitch diameter of the screw minus a material-specific factor. DIN 7504 K The standard specifies requirements for
The "K" version likely refers to a specific part of the standard, possibly related to a particular type of screw or application. tap its own thread