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For a reliable, corrosion‑resistant fastener that taps its own threads in sheet metal, plastic, or wood, these M4 pan head self-tapping screws are a great pick. Manufactured from 304 A2‑70 stainless steel, they provide excellent resistance to rust and mild chemicals — ideal for indoor and outdoor use, including marine and coastal projects. The Phillips pan head sits cleanly on the surface, delivering a smooth, professional look while keeping the drive centered and easy. Because they are self-tapping, you skip the extra step of pre‑tapping or adding nuts; just drill a pilot hole (or drive straight through thin material) and go. BRT Fasteners supplies this single-diameter M4 screw in a variety of lengths, making it a go‑to choice for electronics chassis, automotive trim, light fixtures, furniture, and general repairs where strength and corrosion resistance matter.
| Size | Thread Diameter | Head Diameter (dk) | Head Thickness (k) | Typical Lengths (mm)* | Head Style | Drive | Material |
|---|---|---|---|---|---|---|---|
| M4 | 4.0 mm | ~8.0 mm | ~2.6 mm | 8, 10, 12, 16, 20, 25, 30, 40, 50 | Pan Head | Phillips | 304 (A2-70) Stainless Steel |
* Lengths are measured from under the head (thread length only). Exact head dimensions match GB/T845 and may vary slightly. Select your preferred length from the listing options.
A2 is the international designation for 304 stainless steel — a chromium‑nickel alloy with excellent corrosion resistance. “70” indicates the minimum tensile strength (700 MPa) in the cold‑worked condition. So A2-70 gives you the rust protection of 304 stainless with the strength of a Grade 5 steel fastener.
Yes. 304 stainless is widely used in coastal and marine environments. It resists red rust effectively, though in constant salt spray it can develop light surface tea staining. Periodic rinsing with fresh water keeps them looking bright.
In thin sheet metal (up to about 1.5 mm), you can often drive these screws directly without a pilot hole. For thicker steel, hard plastics, or dense wood, a pilot hole about 3.2 mm to 3.4 mm in diameter will make driving easier and extend thread life.
Yes. The self‑tapping thread bites well into both softwood and hardwood. For very hard woods like oak or maple, a pilot hole is recommended to prevent snapping and ensure a clean installation.
304 stainless is generally non‑magnetic in the annealed state. After cold working (such as thread forming or driving), a very weak magnetic response can develop, but it’s negligible compared to that of carbon steel. They are safe for most electronics and MRI‑adjacent installations.
