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When you need a clean, flush finish and the strength to drill into metal, these hex socket flat head self‑drilling screws deliver. The 410 stainless steel construction gives you higher hardness than 304, so the drill tip stays sharp through sheet metal, steel framing, and hard plastics. A flat head sits nearly flush with the surface, reducing snags and leaving a neat, professional look. The internal hex (Allen) drive allows higher torque without cam‑out, making them ideal for tight spaces where a Phillips bit might slip. Available in two robust diameters — M5.2 and M6.3 — and lengths from 16 mm to 50 mm, this series is built for metal roofing, HVAC ductwork, automotive panels, and mixed‑material connections. No pilot hole, no separate tap — just drill, drive, and you’re done.
| Thread Size | Thread Diameter (d) | Head Diameter (dk) | Head Thickness (k) | Hex Socket Size (s) | Available Lengths (mm)* | Drive | Material & Finish |
|---|---|---|---|---|---|---|---|
| M5.2 | 5.2 mm | 11.9 mm | 2.8 mm | 4 mm | 16, 19, 25, 32, 38, 45, 50 | Hex Socket (Allen) | 410 Stainless Steel, Natural |
| M6.3 | 6.3 mm | 12.6 mm | 2.9 mm | 4 mm | 16, 19, 25, 32, 38, 45, 50 | Hex Socket (Allen) | 410 Stainless Steel, Natural |
* Lengths are thread length only (measured from under the head). Head dimensions shown in the technical drawing are approximate. All screws are self‑drilling and fully threaded.
No. The self‑drilling tip acts like a drill bit and will penetrate sheet metal up to about 2 mm thick, as well as wood and plastic, without a pilot hole. For thicker steel or very hard alloys, a small pilot hole can reduce driving torque, but in most common applications, they are true one‑step fasteners.
Both M5.2 and M6.3 screws use a 4 mm hex key (Allen wrench). A high‑quality, correctly fitting key will minimize cam‑out and prolong the life of the socket.
Yes. 410 stainless offers good atmospheric corrosion resistance and is commonly used for outdoor metal roofing, siding, and automotive applications. It is harder than 304, so it holds its edge longer. For constant saltwater exposure, 316 would be a better choice, but for rain and general outdoor conditions, 410 performs very well.
All listed lengths are the thread length only, measured from directly under the flat head to the tip. The head thickness is additional, allowing you to accurately match the screw to the material thickness you’re fastening.
