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Drill and fasten in one motion with these Phillips countersunk self-drilling screws. The hardened drill tip bores through sheet metal, steel framing, and wood without a pilot hole, while the countersunk head sits flush for a clean, professional finish. Choose from two material options: 410 stainless steel for higher hardness and moderate corrosion resistance in dry environments, or blue zinc-plated carbon steel for strong rust protection in outdoor or damp locations. With M4.2 and M4.8 diameters and lengths from 13 mm to 60 mm, they're perfect for metal roofing, HVAC ductwork, auto body panels, timber decking, and general fabrication. BRT Fasteners delivers both durability and speed — just load your Phillips bit and drive.
| Thread Size | Thread Diameter | Available Lengths (mm)* | Head Style | Drive | Material Options | Surface Finish |
|---|---|---|---|---|---|---|
| M4.2 | 4.2 mm | 13, 16, 19, 25, 32, 38, 50, 60 | Countersunk Flat Head | Phillips | 410 Stainless / Carbon Steel | 410 Stainless: Natural (no coating) Carbon Steel: Blue Zinc Plated |
| M4.8 | 4.8 mm | 13, 16, 19, 25, 32, 38, 50, 60 | Countersunk Flat Head | Phillips | 410 Stainless / Carbon Steel | 410 Stainless: Natural (no coating) Carbon Steel: Blue Zinc Plated |
* Length is thread length only, excluding head. Select your preferred material, thread size, and length combination from the listing options above.
No. The drill‑shaped tip creates its own hole as you drive. They cut through sheet metal up to about 2 mm thick and into wood directly. For thicker or harder materials, you may still want a small pilot hole, but in most common applications they are truly one‑step fasteners.
410 stainless steel is harder and offers limited corrosion resistance; it's best for indoor or dry locations. Blue zinc-plated carbon steel provides a strong rust‑resistant coating and is recommended for outdoor, damp, or humid environments. Both are strong, but the zinc-plated option gives you better all‑weather performance.
Yes. The self-drilling tip goes through thin metal and bites into the wood substrate beneath. They're commonly used for securing metal brackets to timber or fastening wood to metal studs. A slight pilot hole in very hard wood will always make driving easier.
M4.2 screws typically require a #2 Phillips bit, while M4.8 screws may use a #2 or #3 bit depending on the exact recess. Always test the fit; the bit should seat fully without wobble to avoid cam‑out and preserve the screw head.
410 stainless has a lower chromium content than 304 or 316 and is not as corrosion‑resistant. It will resist light moisture but can develop surface rust over time, especially outdoors or in wet conditions. For outdoor or coastal projects, choose the blue zinc-plated carbon steel or consider a 304 stainless option.
