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For assemblies that demand both corrosion resistance and reliable strength, these 304 A2-70 stainless steel self-tapping screws are the right call. The A2-70 grade means you get the weather‑proof performance of 304 stainless with a minimum tensile strength of 700 MPa — strong enough for metal brackets, automotive trim, and outdoor enclosures. A clean Phillips pan head sits flush and provides a slip‑resistant drive, while the sharp self‑tapping thread eliminates the need for pre‑tapped holes or nuts. BRT Fasteners supplies the two most popular small diameters — M2.2 and M3 — each in a variety of lengths. Ideal for electronics chassis, sheet metal panels, woodworking, plastic housings, and any project where a rust‑proof, high‑strength fastener matters.
| Size | Thread Diameter | Typical Lengths (mm)* | Head Style | Drive | Material & Grade |
|---|---|---|---|---|---|
| M2.2 | 2.2 mm | 5, 6, 8, 10, 12, 16 | Pan Head | Phillips | 304 Stainless Steel (A2-70) |
| M3 | 3.0 mm | 6, 8, 10, 12, 16, 20, 25, 30 | Pan Head | Phillips | 304 Stainless Steel (A2-70) |
* Lengths are thread length only (excluding head). Dimensional standards follow GB/T845. Select your preferred size and length from the listing options.
A2 is the international designation for 304 stainless steel — a chromium‑nickel alloy with great corrosion resistance. The “70” stands for a minimum tensile strength of 700 MPa (roughly equivalent to Grade 5 carbon steel). So you get the rust protection of 304 with very solid mechanical strength.
Absolutely. 304 stainless steel is widely used for outdoor and coastal projects. It naturally resists rain, humidity, and mild chemicals. They won’t develop red rust like ordinary steel. For submerged saltwater use, you would move to 316, but for normal outdoor conditions, they hold up exceptionally well.
In thin sheet metal or soft plastic, you can often drive them directly. For thicker materials or hardwoods, we recommend a pilot hole about 80% of the screw diameter — roughly 1.8 mm for M2.2 and 2.4 mm for M3. This reduces drive torque and ensures a clean, strong thread engagement.
M2.2 screws take a #0 or #1 Phillips bit (test for best fit), while M3 screws use a #1 Phillips bit. A well‑fitting bit applied with steady pressure will prevent cam‑out and preserve the screw head.
They are solid 304 stainless throughout — not a coating. There is no surface treatment to wear off. The natural silver color comes from the alloy itself, so even if the screw gets scratched, it remains corrosion‑resistant.
