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When standard heads pull through or sit too small, these 316 stainless steel big flat head self‑tapping screws step in. The oversized flat head gives you a wide, load‑spreading bearing surface that prevents the screw from sinking into thin sheet metal, plastic, or wood — no separate washers needed. Made from genuine marine‑grade 316 (A4) stainless steel, they deliver the ultimate corrosion resistance for saltwater, chemical, and extreme outdoor environments where 304 just isn’t enough. The sharp self‑tapping thread bites instantly and forms its own tight thread, letting you fasten through metal sheet, enclosures, boat hardware, and structural brackets without pre‑tapping. A deep Phillips drive gives positive bit engagement and reduces cam‑out even when you’re working overhead or in tight spots. Available from M2 through M6 with lengths from 6 mm up to 60 mm, this series has the exact size for your toughest marine, automotive, and outdoor fastening jobs.
| Size | Thread Diameter | Typical Lengths (mm)* | Head Style | Drive | Material |
|---|---|---|---|---|---|
| M2 | 2.0 mm | 6, 8, 10, 12, 16 | Big Flat Head | Phillips | 316 (A4) Stainless Steel |
| M2.5 | 2.5 mm | 8, 10, 12, 16, 20 | Big Flat Head | Phillips | 316 (A4) Stainless Steel |
| M3 | 3.0 mm | 10, 12, 16, 20, 25, 30 | Big Flat Head | Phillips | 316 (A4) Stainless Steel |
| M4 | 4.0 mm | 12, 16, 20, 25, 30, 40 | Big Flat Head | Phillips | 316 (A4) Stainless Steel |
| M5 | 5.0 mm | 16, 20, 25, 30, 40, 50 | Big Flat Head | Phillips | 316 (A4) Stainless Steel |
| M6 | 6.0 mm | 20, 25, 30, 40, 50, 60 | Big Flat Head | Phillips | 316 (A4) Stainless Steel |
* Lengths are thread length only (excluding head). Exact dimensions and head diameters are shown in the product photos. Select your preferred size and length from the listing options.
316 (A4) stainless steel contains molybdenum, which dramatically improves resistance to chlorides — think saltwater, coastal spray, and harsh chemicals. If your fasteners will face constant marine exposure, swimming pools, or industrial chemicals, 316 is the material you need to avoid pitting and red rust.
The head diameter is noticeably larger than a standard flat head of the same thread size. This wider surface area spreads the clamping load, preventing the screw from pulling through thin or soft materials. It often eliminates the need for a separate flat washer.
In thin sheet metal and soft plastic, you can often drive them directly. For steel thicker than about 1.2 mm or hardwoods, a pilot hole about 80% of the thread diameter is recommended. The screw will then form its own perfect matching thread as it goes in.
Absolutely. 316 stainless is the standard for above‑ and below‑waterline marine fasteners. It won’t rust or pit from salt spray like 304 eventually can. They’re a safe choice for deck hardware, brackets, railings, and electronics enclosures on boats.
