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You want the holding power of a wide truss head and the clean look of black hardware – but not at the expense of rust protection. That’s exactly why these Phillips truss head self-tapping screws are made from genuine A2-304 stainless steel and then hardened with a high‑temperature blackening treatment. The deep black finish isn’t paint or plating; it’s chemically bonded to the metal so it won’t chip, peel, or expose raw steel. The oversized truss head spreads clamping force wide to stop pull‑through in thin sheet metal, plastic, and wood, while the self‑tapping thread cuts its own path as you drive. Available in M3, M4, M5, and M6 diameters, these screws are a go‑to for automotive trim, outdoor enclosures, marine hardware, and any project where strength, style, and weather resistance must all show up.
| Thread Spec. | Thread Diameter (d) | Thread Pitch | Head Diameter (dk) | Head Thickness (k) | Typical Lengths (mm)* | Head Style | Drive | Material & Finish |
|---|---|---|---|---|---|---|---|---|
| M3 | 3.0 mm | 1.1 mm | 6.5 mm | 1.6 mm | 8, 10, 12, 16, 20, 25 | Truss Head | Phillips | A2-304 Stainless, Blackened |
| M4 | 4.0 mm | 1.3 mm | 8.7 mm | 2.1 mm | 10, 12, 16, 20, 25, 30, 40 | Truss Head | Phillips | A2-304 Stainless, Blackened |
| M5 | 5.0 mm | 1.6 mm | 10.8 mm | 2.8 mm | 12, 16, 20, 25, 30, 40, 50 | Truss Head | Phillips | A2-304 Stainless, Blackened |
| M6 | 6.0 mm | 1.8 mm | 13.1 mm | 3.3 mm | 16, 20, 25, 30, 40, 50, 60 | Truss Head | Phillips | A2-304 Stainless, Blackened |
* Lengths are thread length only, excluding head. Select your preferred size and length from the product variations. All dimensions meet metric standards.
No. The black finish is a high‑temperature oxidation process – not a paint or plating. It won’t chip, peel, or wear away under normal use. Because the screws are solid 304 stainless underneath, they stay corrosion‑resistant even if scratched.
A truss head has a noticeably larger and flatter bearing surface. This spreads the clamping force wider, which means the screw head won’t sink into or pull through thin sheet metal, plastic, or soft wood. You get a stronger, cleaner hold without adding washers.
In thin sheet metal (up to about 1.2 mm), you can often drive them directly. For thicker steel, hard plastics, or dense wood, a small pilot hole will make driving easier and give you the strongest thread grip. The screws are self‑tapping, not self‑drilling, so they need a starting point in harder materials.
304 stainless is generally non‑magnetic in the annealed state. After cold working (like thread forming), a very slight magnetic response can develop, but it’s negligible compared to ordinary steel. They’re safe for electronics and sensitive equipment.
