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Drill and fasten in one step with these black self‑drilling wafer head screws. The built‑in drill point punches through sheet metal, steel studs, and wood without a pilot hole, saving you time and tool changes. A wide, low‑profile wafer head spreads the clamp force to prevent pull‑through, while the black finish keeps the hardware discreet on dark surfaces. Manufactured from 410 stainless steel, they deliver higher hardness than standard 304 and good corrosion resistance for indoor and light outdoor use – perfect for metal roofing, HVAC ducts, automotive panels, and steel framing. Available in M4.2 and M4.8 diameters with lengths from 13 mm to 50 mm, each size is deeply threaded for a strong, vibration‑resistant hold. Whether you’re hanging ductwork or assembling a shed, these screws let you skip the pilot hole and get on with the job.
| Size | Thread Diameter | Typical Lengths (mm) | Head Style | Drive | Material & Finish |
|---|---|---|---|---|---|
| M4.2 | 4.2 mm | 13, 16, 19, 25, 32, 38, 50 | Wafer (Modified Truss) | Phillips | 410 Stainless Steel, Black |
| M4.8 | 4.8 mm | 13, 16, 19, 25, 32, 38, 50 | Wafer (Modified Truss) | Phillips | 410 Stainless Steel, Black |
* Lengths measured from under the head. Exact dimensions follow manufacturer standards. Choose your preferred diameter and length from the product options.
That’s correct. The drill‑shaped tip will penetrate thin sheet metal (up to about 1.5 mm) and wood composites without pre‑drilling. For thicker or harder materials, you may still use a small pilot hole to reduce drive torque, but in most common applications these screws are true one‑step fasteners.
410 stainless steel is magnetic and harder than 304, offering better wear resistance and strength. It provides good resistance to atmospheric corrosion and is suitable for indoor and mild outdoor use. For constant exposure to saltwater or heavy chemicals, 304 or 316 would be preferable, but for metal roofing, HVAC, and general construction, 410 holds up very well.
M4.2 screws typically require a #2 Phillips bit, while M4.8 screws may use a #2 or #3 Phillips bit depending on the exact recess. A bit in good condition will minimize cam‑out and extend the life of the screw head.
Absolutely. The self‑drilling tip will go through the metal layer and bite into the wood substrate beneath. They are commonly used for attaching metal roofing to wood purlins, metal brackets to timber studs, and many other mixed‑material assemblies.
