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When the job demands the highest level of corrosion resistance, these A4 / 316 stainless steel self‑tapping screws are the answer. With molybdenum added to the alloy, 316 stainless shrugs off saltwater, chlorine, and harsh chemicals that would pit or rust 304 — making these screws the go‑to choice for marine hardware, chemical processing equipment, coastal construction, and outdoor electronic enclosures. The Phillips pan head sits near‑flush and provides a slip‑resistant drive, while the sharp self‑tapping thread cuts its own path into sheet metal, wood, plastic, and composites — no tap, no pilot hole in most thin materials. Covering eight metric diameters from M2 to M6, this range puts true marine‑grade fastening in your toolbox for everything from boat deck hardware and outdoor lighting to industrial panels and precision machinery.
| Size | Thread Diameter | Available Lengths (mm)* | Head Style | Drive | Material |
|---|---|---|---|---|---|
| M2 | 2.0 mm | 4 – 20 | Pan Head | Phillips | A4 316 Stainless Steel |
| M2.2 | 2.2 mm | 5 – 25 | Pan Head | Phillips | A4 316 Stainless Steel |
| M2.6 | 2.6 mm | 6 – 30 | Pan Head | Phillips | A4 316 Stainless Steel |
| M3 | 3.0 mm | 6 – 40 | Pan Head | Phillips | A4 316 Stainless Steel |
| M3.5 | 3.5 mm | 8 – 50 | Pan Head | Phillips | A4 316 Stainless Steel |
| M4 | 4.0 mm | 8 – 60 | Pan Head | Phillips | A4 316 Stainless Steel |
| M5 | 5.0 mm | 12 – 80 | Pan Head | Phillips | A4 316 Stainless Steel |
| M6 | 6.0 mm | 16 – 100 | Pan Head | Phillips | A4 316 Stainless Steel |
* Lengths are thread length only (not including head). Exact length options per size are shown in the listing variations. Dimensions conform to GB/T845 equivalent standards.
316 stainless steel contains molybdenum, which gives it far superior resistance to chlorides (saltwater) and harsh chemicals. It’s the standard for marine above‑and‑below‑waterline use, chemical tanks, and coastal buildings. 304 is great for fresh water and general outdoor use, but 316 is what you need when salt or chemicals are present.
In thin sheet metal (up to about 1.5 mm), they will often self‑tap directly. For thicker steel or very hard materials, we recommend a pilot hole roughly 80% of the thread diameter. This ensures the longest thread life and easiest driving.
316 stainless is essentially non‑magnetic, even after cold working. This makes them safe for use around sensitive electronics, medical equipment, and navigation gear where even a weak magnetic field would be a concern.
All listed lengths are the thread length only — measured from directly under the pan head to the tip. Simply choose a length that matches your material thickness for the best clamping force.
