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A wide‑bearing head that won’t pull through thin material — that’s the advantage of these Phillips truss head self-tapping screws. Stamped from 201 stainless steel, they deliver strong corrosion resistance in damp, indoor, and mildly outdoor settings without the cost of 304 or 316 grades. The oversized truss head spreads clamping force over a much larger area than a standard pan or flat head, making it ideal for sheet metal, plastic panels, wood, and fiberglass where a smaller head would tear through. Self‑tapping threads cut cleanly as you drive, eliminating the need for pre‑tapped holes or nuts — a real time‑saver for HVAC ductwork, automotive interior panels, electrical enclosures, and furniture assembly. BRT Fasteners supplies the three most requested diameters: M3, M4, and M5, giving you a reliable, low‑cost stainless fastening solution for light‑ to medium‑duty projects.
| Size | Thread Diameter (d) | Head Diameter (dk) | Head Thickness (k) | Typical Lengths (mm)* | Head Style | Drive | Material |
|---|---|---|---|---|---|---|---|
| M3 | 3.0 mm | 6.5 mm | 1.6 mm | 8 – 30 | Truss Head | Phillips | 201 Stainless Steel |
| M4 | 4.0 mm | 8.7 mm | 2.1 mm | 10 – 40 | Truss Head | Phillips | 201 Stainless Steel |
| M5 | 5.0 mm | 10.8 mm | 2.8 mm | 12 – 50 | Truss Head | Phillips | 201 Stainless Steel |
* Lengths depend on pack selection. All dimensions comply with metric standards. Head dimensions are approximate and match the provided size chart.
201 stainless provides good resistance to oxidation, moisture, and mild chemicals. It’s a great choice for indoor equipment, covered outdoor areas, and general hardware. For permanent outdoor exposure or saltwater environments, 304 or 316 would be better options — but for most workshop and household applications, 201 holds up very well at a lower cost.
In thin sheet metal (up to about 1.2 mm), you can drive them directly without a pilot hole. For thicker metal, hard plastics, or dense wood, a small pilot hole (about 80% of the screw diameter) will make driving easier and give you the strongest thread engagement.
A truss head has a significantly wider, flatter bearing surface than a standard pan head. This spreads the clamping force over a larger area, which prevents the screw from pulling through thin or soft materials. It’s the go‑to choice for fastening plastic panels, thin sheet metal, and fiberglass.
Use a #1 Phillips bit for M3 and a #2 Phillips bit for M4 and M5. A sharp, unworn bit reduces cam‑out and keeps the drive recess in good condition.
201 stainless steel is generally non‑magnetic in its annealed state, but cold‑working (like thread forming or driving) can induce a very weak magnetic pull. They are still safe for use near most electronics and will not strongly attract magnets like ordinary carbon steel.
