1. Product Name & Standard Official Name: Hexagon Flange Head Self-Drilling Screw Standard: DIN 7504-K 2. Structural Features Hexagonal flange head design. One version comes with integrated EPDM rubber sealing washer. Equipped with continuous thread and self-drilling drill point at the tip. It can drill, tap and fasten materials in one operation without pre-drilling holes. 3. Material & Strength Grade Material: Carbon steel. Stainless steel options are available upon request. 4. Surface Treatment Standard finish: Blue white zinc plating to offer basic anti-corrosion performance. 5. Key Advantages -No pre-drilling required, simplifies construction and improves installation efficiency. -The matched EPDM washer provides excellent waterproof and sealing effect to prevent water leakage. -Hex flange head delivers large bearing surface, avoids sinking and ensures stable clamping force. -Two configurations (with / without sealing washer) satisfy different building fastening demands. 6. Application Scenarios Widely used for metal roofing, purlins, steel cladding, carport, greenhouse and general light steel structure installation.