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Drill, tap, and fasten in one clean motion with these Phillips countersunk self‑drilling Tek screws. The hardened 410 stainless steel tip punches through steel up to 6 mm thick without a pilot hole, while the 90° flat head seats flush — giving metal roofing, frames, and panels a smooth, professional look. Because the corrosion resistance is built into the martensitic stainless body, you can count on reliable outdoor and industrial performance without a coating that chips or peels. Covering the full range from #6 up to #14 and lengths from 13 mm to 75 mm, this series puts the right fastener in your hand for light‑gauge ductwork, heavy trailers, and everything in between.
| Size | Thread Diameter (D) | Lengths (L)* | Head Diameter (DK) | Head Thickness (K) | Angle Iron Thickness | Drive | Material |
|---|---|---|---|---|---|---|---|
| #6 | 3.5 mm | 13 – 38 mm | 6.8 mm | 2.8 mm | 0.9 – 2.8 mm | Phillips | 410 Stainless Steel |
| #7 | 3.9 mm | 13 – 32 mm | 7.25 mm | 2.75 mm | 0.7 – 2.4 mm | Phillips | 410 Stainless Steel |
| #8 | 4.2 mm | 13 – 60 mm | 7.9 mm | 3.15 mm | 1.75 – 3.0 mm | Phillips | 410 Stainless Steel |
| #10 | 4.8 mm | 13 – 75 mm | 9.3 mm | 4.15 mm | 1.75 – 4.4 mm | Phillips | 410 Stainless Steel |
| #12 | 5.5 mm | 19 – 75 mm | 10.8 mm | 5.31 mm | 1.75 – 5.25 mm | Phillips | 410 Stainless Steel |
| #14 | 6.3 mm | 19 – 75 mm | 11.3 mm | 6.1 mm | 2.0 – 6.0 mm | Phillips | 410 Stainless Steel |
* Lengths are overall length (including head). Exact availability varies per size; please choose from the listing drop‑down. DIN 7504‑P compliant.
No. The self‑drilling tip is designed to cut through the steel thicknesses listed in the table. Simply place the screw against the metal and apply steady pressure with your driver — the screw will drill its own hole and form its own thread.
410 stainless is martensitic, meaning it can be hardened and offers higher strength and wear resistance than 304. It handles fresh water, steam, and mild chemicals well, but for constant saltwater exposure, 304 or 316 is preferable. For roofing, trailers, and general outdoor construction, 410 provides excellent longevity.
All lengths are overall length, measured from the top of the countersunk head to the tip. This makes it easy to determine how deep the screw will penetrate your material.
Sizes #6 and #7 use a #2 Phillips bit. #8 and #10 use #2 or #3, while #12 and #14 typically require a #3 bit. Always use a sharp, unworn bit to avoid cam‑out.
