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When you need a self‑tapping screw with real structural strength and corrosion resistance, these A2 / 304 stainless steel pan head screws deliver. Designed for medium‑duty metal‑to‑metal and metal‑to‑wood connections, the coarse self‑tapping thread cuts its own clean path into sheet metal, steel framing, hard plastics, and dense wood — no pre‑tap, no pilot hole in most materials up to 2 mm. The Phillips pan head gives a flush, professional finish and provides a confident drive with a standard bit, while the natural stainless surface won’t chip, peel, or red‑rust in wet, humid, or outdoor environments. Covering the three most requested larger diameters — M5, M6, and M8 — this series is built for HVAC brackets, automotive repair, outdoor equipment, structural framing connections, and general heavy‑duty shop work.
| Size | Thread Diameter | Typical Lengths (mm)* | Head Style | Drive | Material |
|---|---|---|---|---|---|
| M5 | 5.0 mm | 10, 12, 16, 20, 25, 30, 40, 50 | Pan Head | Phillips | 304 Stainless Steel |
| M6 | 6.0 mm | 12, 16, 20, 25, 30, 40, 50, 60 | Pan Head | Phillips | 304 Stainless Steel |
| M8 | 8.0 mm | 16, 20, 25, 30, 40, 50, 60, 80 | Pan Head | Phillips | 304 Stainless Steel |
* Lengths are thread length only (not including head). GB/T845 equivalent dimensional standards. Choose your exact size and length from the product options.
For steel up to about 1.5–2 mm, you can often drive them directly. For thicker structural steel or very hard materials, we recommend a pilot hole roughly 80% of the thread diameter. This keeps the thread sharp and reduces the driving torque.
Yes. 304 stainless is the standard choice for outdoor and humid environments. It won’t develop red rust like plated carbon steel. For submerged saltwater or constant chemical exposure, 316 is preferred, but for rain, sun, and general shop use, 304 lasts for years.
M5 and M6 typically use a #2 Phillips bit. M8 screws usually require a #3 bit. Always use a sharp, correctly fitting bit to avoid cam‑out and preserve the drive recess.
No. All listed lengths are the thread length only, measured from directly under the pan head to the tip. This makes it simple to match the screw to how much material you’re going through.
