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Get roofing and steel‑siding jobs done faster with these hex head self‑drilling Tek screws. The hardened drill point bores through sheet metal, steel purlins, and composite panels without a pilot hole, while the external hex head gives you high‑torque driving with a standard socket – no cam‑out, no stripped heads. Manufactured from 410 stainless steel, they deliver superior hardness and good atmospheric corrosion resistance, making them a reliable choice for metal roofing, wall cladding, structural framing, and general‑shop fabrication. The built‑in flange provides a broad bearing surface to resist pull‑through, and the natural silver finish blends cleanly with plain metal and coated sheets alike. Available in the four most requested diameters – M4.2, M4.8, M5.2, and M6.3 – with lengths to match your specific material stack‑up.
| Size | Thread Diameter (ds) | Flange Diameter (s) | Head Height (k) | Typical Lengths (mm)* | Head Style | Drive | Material |
|---|---|---|---|---|---|---|---|
| M4.2 | 6.2 mm | 8.6 mm | 3.8 mm | 13, 16, 19, 25, 32, 38, 50 | Hex Flange | External Hex (8 mm) | 410 Stainless Steel |
| M4.8 | 7.8 mm | 10.4 mm | 4.1 mm | 13, 16, 19, 25, 32, 38, 50 | Hex Flange | External Hex (8 mm) | 410 Stainless Steel |
| M5.2 | 7.6 mm | 11.9 mm | 5.3 mm | 16, 19, 25, 32, 38, 50 | Hex Flange | External Hex (10 mm) | 410 Stainless Steel |
| M6.3 | 9.4 mm | 12.7 mm | 5.6 mm | 19, 25, 32, 38, 50, 60 | Hex Flange | External Hex (10 mm) | 410 Stainless Steel |
* Lengths are thread length only (not including head). Dimensional data refers to the 410 stainless steel version. Also available in color zinc-plated carbon steel for certain sizes. Exact hex socket sizes may vary slightly – see product photos for details.
No. The drill‑point tip will penetrate sheet steel up to approximately 2 mm thick and wood without pre‑drilling. For thicker structural steel, a pilot hole may be recommended, but in standard roofing and cladding applications, they are true one‑step fasteners.
M4.2 and M4.8 typically use an 8 mm (5/16″) socket. M5.2 and M6.3 usually require a 10 mm socket. A magnetic nut driver bit speeds up installation and helps the screw stay on the bit.
Yes. The drill tip goes through the metal layer and bites firmly into the wood substrate. They’re widely used for securing metal roofing sheets to timber purlins and for varied mixed‑material connections.
410 stainless is harder and stronger than 304, but it contains less chromium, so it’s not as corrosion‑resistant in constant salt spray or harsh chemical environments. It is, however, excellent for outdoor metal roofing, siding, and general construction where occasional rain and humidity are the main exposures. For harsh marine or submersion applications, 304 or 316 is preferred.
