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Get the rugged holding power of a wide truss head with the clean, low‑profile look of a black finish — without sacrificing an ounce of corrosion resistance. These Phillips truss head self-tapping screws are crafted from genuine A2/304 stainless steel and hardened, then treated with a high‑temperature oxidation process that turns the surface a deep, matte black. Unlike painted or coated screws, the black layer is chemically bonded to the stainless substrate: it won’t chip, peel, or leave exposed steel that rusts. The oversized truss head spreads clamping force evenly, preventing pull‑through in thin sheet metal, plastic panels, wood, and fiberglass. Sharp self‑tapping threads cut their own path as you drive — no tap, no pilot hole in most materials. Available from M2.9 to M4.2, this series covers electronics enclosures, automotive interior panels, outdoor fixtures, marine hardware, and any project where strength, style, and weather resistance are non‑negotiable.
| Diameter | Thread Size | Typical Length Range (mm)* | Head Style | Drive | Material & Finish |
|---|---|---|---|---|---|
| M2.9 | 2.9 mm | 6 – 25 | Truss Head | Phillips | 304 Stainless Steel, High‑Temp Black Oxide |
| M3.5 | 3.5 mm | 8 – 40 | Truss Head | Phillips | 304 Stainless Steel, High‑Temp Black Oxide |
| M3.9 | 3.9 mm | 10 – 50 | Truss Head | Phillips | 304 Stainless Steel, High‑Temp Black Oxide |
| M4.2 | 4.2 mm | 12 – 60 | Truss Head | Phillips | 304 Stainless Steel, High‑Temp Black Oxide |
* Lengths are thread length only, excluding head. Select your preferred size from the listing options.
The black color is a high‑temperature oxidation layer, not paint. It forms directly on the stainless steel and won’t chip or peel. Because the base material is genuine 304 stainless, it resists red rust even in outdoor or marine environments — just like natural silver 304, only darker.
A truss head has a noticeably wider and flatter bearing surface than a pan head. This spreads the clamping force over a larger area, which prevents the head from pulling through thin sheet metal, plastic, or soft wood. It gives you a stronger clamp without needing a separate washer.
Yes. The sharp self‑tapping thread engages both wood and sheet metal equally well. For hardwoods like oak or maple, we recommend a small pilot hole (about 80% of the screw diameter) to make driving easier and protect the thread.
In thin sheet metal up to about 1.2 mm, you can usually drive them straight in. For thicker steel or harder materials, a pilot hole will reduce drive torque and ensure the cleanest thread engagement.
304 stainless is generally non‑magnetic in its annealed state. After cold working (like thread forming), a very weak magnetic response can develop, but it’s negligible compared to that of carbon steel. They are safe for electronics and sensitive installations.
