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Get a clean, flush finish while drilling and fastening in one step with these flat-head self‑drilling screws. The countersunk 90° head sits perfectly flush in sheet metal, wood, and composite panels, leaving nothing to snag. The self‑drilling tip eliminates pilot holes in thin steel up to the thicknesses listed for each diameter, saving time on roofing, siding, and framing jobs. Choose 410 stainless steel for high hardness and wear resistance, A2/304 stainless for superior corrosion protection in outdoor or humid environments, or carbon steel with blue zinc plating for an economical, indoor‑oriented option. Covering the complete range from #6 (3.5 mm) up to #14 (6.3 mm), this series provides a precision fastener for light‑ to medium‑duty sheet metal, plastic, and wood connections.
| Size (Imperial) | Thread Diameter (d) | Head Diameter (dk) | Head Thickness (k) | Steel Thickness (Angle Iron) | Typical Lengths (mm)* | Drive | Material Options |
|---|---|---|---|---|---|---|---|
| #6 | 3.5 mm | — | — | — | 13–50 | Phillips | 304 / 410 SS, Carbon Steel Blue Zinc |
| #7 | 3.9 mm | 7.25 mm | 2.75 mm | 2.0–3.0 mm | 13–50 | Phillips | 304 / 410 SS, Carbon Steel Blue Zinc |
| #8 | 4.2 mm | 7.90 mm | 3.15 mm | 3.0–4.0 mm | 13–50 | Phillips | 304 / 410 SS, Carbon Steel Blue Zinc |
| #10 | 4.8 mm | 9.30 mm | 4.15 mm | 4.0–6.0 mm | 16–60 | Phillips | 304 / 410 SS, Carbon Steel Blue Zinc |
| #12 | 5.5 mm | 10.8 mm | 5.31 mm | 4.0–8.0 mm | 19–70 | Phillips | 304 / 410 SS, Carbon Steel Blue Zinc |
| #14 | 6.3 mm | — | — | — | 25–80 | Phillips | 304 / 410 SS, Carbon Steel Blue Zinc |
* Lengths are measured from under the head (thread length only). Head dimensions for #6 and #14 are not provided; approximate values can be seen in product images. 304 stainless is not recommended for drilling into iron/steel due to lower hardness. Blue zinc carbon steel is economical and suitable for indoor use.
No, not for thin sheet metal and wood within the thickness ranges listed in the table. The self‑drilling tip will penetrate the material and form its own hole. For thicker steel, a pilot hole may reduce driving torque, but in standard applications, they are one‑step fasteners.
304 (A2) stainless steel offers excellent corrosion resistance for outdoor, coastal, or damp environments and will not red‑rust. However, 410 stainless steel is harder and more suitable for drilling into tougher materials. If you are drilling into iron or thick steel, 410 or carbon steel is better; for rust‑prone areas, choose 304.
No. All lengths are measured from under the head to the tip. The head sits flush, and its thickness does not add to the listed length. This makes it easy to select a screw that fully penetrates your material.
Sizes #6 and #7 usually use a #2 Phillips bit. #8 and #10 use a #2 or #3 bit, and #12 and #14 typically require a #3 bit. Always use a sharp bit to avoid cam‑out.
