| Surface Treatment | KP |
Product Introduction
Standard Name: Self-Drilling Screw, Pan Wafer Head, Black Finish, Phillips Drive.
Common Names: Black Wafer Head Self-Drilling Screw, Wafer Head Drill Screw, Black Phillips Pan Head Self-Drilling Screw with Washer.
Product Definition: A high-efficiency fastener integrating drilling, tapping, and securing functions, primarily used for connecting metal sheets. Its distinctive feature is the wafer-shaped washer (Wafer Head/Flange) integrated beneath the pan head, which increases the bearing surface area during installation and protects the workpiece surface. The surface features a black coating and utilizes a Phillips drive.
Self-Drilling Screw Pan Wafer Head Black Phillips Key Features
Pan Wafer Head Design: Wide, low-profile wafer head provides a larger bearing surface. Slightly convex
but low-profile, it's 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.
Black Phosphate/Oxide Coating: Matte black surface provides basic rust protection, wear resistance,
and lubrication, reducing light reflection, suitable for indoor or dry environments.
Phillips Drive: #2 or #3 Phillips drive for easy power tool operation and to prevent slippage.
Various Sizes: Commonly #8-#14 diameter, 1/2"-2" (12-50mm) length, carbon steel.
Working Principle
Drilling Stage: The drill tip penetrates the material (such as a metal sheet), 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 black coating reduces friction, improves efficiency, and provides mild corrosion protection.
Installation Control: The cross-groove design ensures precise drive, preventing over-tightening 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.
Automotive & Electrical: Assembly of body sheet metal or enclosures; the black finish reduces glare.
Building Construction: Fixing lightweight steel structures or drywall to metal joists.
DIY & Repair: Metal connections in home projects; economical and suitable for indoor environments.
