| Standard | DIN 7504 |
| Surface Treatment | ZP |
Product Introduction
Standard Name: Self-Drilling Screw, Pan Wafer Head, Zinc Plated, Phillips Drive.
Common Names: Zinc-Plated Wafer Head Self-Drilling Screw, Wafer Head Self-Drilling Screw with Washer.
Product Definition: A high-efficiency fastener integrating “drilling, tapping, and tightening” functions, primarily used for connecting metal sheets. Its distinctive feature is the integrated wafer-shaped washer (Wafer Head/Flange) on the head, which increases the bearing surface area during installation and effectively protects the workpiece surface from crushing. The surface undergoes electrogalvanized (ZP) treatment and utilizes a Phillips drive.
Self-Drilling Screw Pan Wafer Head ZP Phillips Key Features
Pan Wafer Head Design: Wide and low head provides a large bearing surface; the low profile with a
slight bulge is suitable for securing thin materials and reduces head height.
Self-drilling Tail End: The tip has a tek point, allowing for drilling and tapping without pre-drilling,
completing installation in one step.
Zinc Plated (ZP): Provides basic rust protection and a bright silver finish, enhancing corrosion resistance,
suitable for indoor or slightly humid environments.
Phillips Drive: #2 or #3 Phillips drive for easy power tool operation and to prevent slippage.
Various Sizes: Commonly #8-#14 diameter, length 1/2"-2" (12-50mm), carbon steel.
Working Principle
Drilling Stage: The drill tip penetrates the material (such as a metal plate), quickly drilling a pilot hole.
Tapping and Fixing: The thread follows the cut to form an internal thread, generating axial clamping force.
Head Pressure Distribution: The thin disc head distributes pressure evenly, and the low profile reduces
bulging; the zinc plating reduces friction, improves efficiency, and provides mild corrosion protection.
Installation Control: The cross-groove design ensures precise drive, preventing overtightening and
material damage; the principle involves drilling, cutting, and friction interlocking.
Product Applications
Sheet Metal Fabrication: Fast and efficient fixing of sheet metal, roofing, or wall panels to steel frames.
HVAC & Ventilation: Installation of ducts, brackets, or equipment; the low profile is suitable for compact
spaces.
Building Construction: Fixing lightweight steel structures or drywall to metal joists.
Automotive & Electrical: Assembling body sheet metal or shells; the zinc plating is suitable for indoor
environments.
DIY & Repair: Economical and reliable metal connections in home projects.
