Wafer Head Self Drilling Screws

Wafer head self-drilling screws, also known as flange head drill screws, integrate a built-in washer under the head. This design distributes clamping force over a wider area during fastening, preventing surface denting and loosening. No separate washer is needed, saving assembly time on site.

They are widely used for metal sheet installation, light steel structure, window and door frame fixing, and HVAC duct assembly. The wafer head sits flush against the workpiece surface, while the drill point can drill, tap and fasten in one operation directly on thin steel plates.

In construction projects, installers use these screws to attach metal cladding, decorative panels and brackets. The enlarged flange spreads pressure evenly, so the screw head will not sink into thin metal sheets. Compared with ordinary round head drill screws, it offers better sealing and fixing stability, especially in outdoor applications.

Galvanized coating provides basic corrosion resistance for indoor and mild outdoor environments. When used on roofing and wall panels, it helps keep the connection tight against wind and vibration.

Key notes: Select the correct drill tail type according to the metal thickness. Do not over-tighten, which may crack the sheet. This fastener is ideal for prefab buildings, metal workshop and door & window manufacturing.