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For structural metal‑to‑metal and heavy‑duty metal‑to‑wood connections that demand strength and permanent rust protection, these A2 / 304 stainless steel pan head self‑tapping screws deliver. The large M6 and M8 diameters provide substantial clamping force and shear strength, making them ideal for steel framing, heavy brackets, outdoor railings, trailer decks, and industrial enclosures. Each screw features a sharp, fully‑threaded, coarse self‑tapping thread that cuts its own tight mating thread into sheet metal, hard plastics, dense hardwoods, and composite panels — no pre‑tap, no nuts required. The classic Phillips pan head sits flush with a clean, professional look and provides a sure, cam‑out‑resistant drive. Because it's solid 304 stainless, the corrosion resistance goes all the way through — no coating to wear thin — so these screws keep their grip in rain, humidity, and mild chemical exposure.
| Size | Thread Diameter (d) | Thread Pitch (p) | Head Diameter (dk) | Head Thickness (k) | Available Lengths (mm)* | Head Style | Drive | Material & Finish |
|---|---|---|---|---|---|---|---|---|
| M6 | 6.0 mm | 1.8 mm | 11.9 mm | 4.0 mm | 16, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 100 | Pan Head | Phillips | A2 304 Stainless Steel, Plain |
| M8 | 8.0 mm | 2.1 mm | 13.0 mm | 5.0 mm | 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, 100 | Pan Head | Phillips | A2 304 Stainless Steel, Plain |
* Lengths are thread length only (not including head). All screws are fully threaded. Metric coarse thread conforms to GB/T equivalent standards. For M6 Phillips bits use #3; for M8 use #3 or #4.
For sheet metal up to approximately 1.5 mm, you can often drive them directly. For thicker structural steel, very hard plastics, or dense hardwoods, a pilot hole about 80% of the thread diameter is strongly recommended — roughly 4.8 mm for M6 and 6.4 mm for M8. This reduces driving torque and preserves thread sharpness.
Yes. 304 stainless is the industry standard for outdoor and marine‑above‑waterline fasteners. It resists red rust in rain, humidity, and mild chemical exposure for years. For permanent saltwater submersion, 316 would be preferred, but for outdoor railings, automotive brackets, and general construction, 304 performs beautifully.
M6 screws typically require a #3 Phillips bit. M8 screws may use a #3 or #4 bit, depending on the exact head recess. Always use a sharp, correctly sized bit and apply steady pressure to minimize cam‑out.
No. All listed lengths are the thread length only, measured from directly under the pan head to the tip. Head height is additional, so you can accurately match the screw to the exact thickness of the material you're fastening.
Yes. Every screw in this series is fully threaded from tip to head, ensuring maximum engagement and holding power even in thin materials.
