1. Product Name & Standard Official Name: Wafer Head Self‑Drilling Screw Standard: DIN 7504‑K 2. Structural Features Adopts large wafer‑flange head design, provides larger bearing surface for better pressure distribution. Phillips cross drive for fast installation with screwdriver or power tools. Fully‑threaded shank with self‑drilling drill point, no pre‑drilling required. The drill tip can complete drilling, tapping and fastening in one operation. 3. Material & Strength Grade Main material: Carbon steel C1022. Stainless steel versions can be supplied upon request. Hardened by heat‑treatment to guarantee drilling performance. 4. Surface Treatment Common finishes: Blue white zinc plating; yellow zinc plating for enhanced anti‑rust performance. Special organometallic coating is available for high‑corrosion‑resistance requirements. 5. Key Advantages ‑Wide wafer head avoids sinking into sheet metal and distributes clamping force evenly. ‑Hardened drill point enables fast penetration into steel sheets, saves working time. ‑Complete one‑step drilling‑and‑fastening process improves on‑site installation efficiency. ‑Multiple surface‑treatment options satisfy indoor and outdoor anti‑corrosion demands. 6. Application Scenarios Extensively used for metal sheet installation, light‑steel framing, roofing projects, metal‑to‑wood fastening, ventilation system assembly and general building‑construction applications.