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When a standard pan head just isn’t wide enough to keep thin material from pulling through, these 304 stainless steel truss head screws step up. The oversized, flat‑bottomed head spreads clamping force over a much larger area, so you can fasten sheet metal, plastic panels, fiberglass, and wood without worrying about the head sinking or tearing the workpiece. Because they’re self‑tapping, you drive them straight in — the sharp thread cuts its own perfect mating thread without a pre‑tap or nut. Made from genuine A2 / 304 stainless with a natural, uncoated finish, they’ll hold up in wet, humid, and outdoor environments without red rust. Available in the four most requested sizes (M3, M4, M5, M6) and a range of lengths, they’re a go‑to for HVAC ductwork, automotive panels, electronics enclosures, and general‑shop repairs.
| Size | Thread Diameter | Typical Lengths (mm)* | Head Style | Drive | Material |
|---|---|---|---|---|---|
| M3 | 3.0 mm | 8, 10, 12, 16, 20, 25, 30 | Truss Head | Phillips | 304 Stainless Steel |
| M4 | 4.0 mm | 10, 12, 16, 20, 25, 30, 40 | Truss Head | Phillips | 304 Stainless Steel |
| M5 | 5.0 mm | 12, 16, 20, 25, 30, 40, 50 | Truss Head | Phillips | 304 Stainless Steel |
| M6 | 6.0 mm | 16, 20, 25, 30, 40, 50, 60 | Truss Head | Phillips | 304 Stainless Steel |
* Lengths are thread length only (excluding head). All sizes comply with GB/T equivalent standards. Select your exact size from the listing options.
A truss head has a noticeably wider, flatter bearing surface. It distributes force over a larger area, which stops the screw from pulling through thin or soft materials. You get the secure hold of a screw plus a built‑in washer effect.
Yes. 304 stainless is highly resistant to moisture and mild chemicals. It won’t red‑rust like carbon steel, even in rain or humidity. For permanent saltwater immersion, you’d step up to 316, but for outdoor, automotive, and general shop use, 304 performs beautifully for years.
In thin sheet metal (up to ~1.2 mm) and most plastics, you can often drive them directly. For thicker metal or dense hardwoods, a small pilot hole (about 80% of the thread diameter) makes driving easier and guarantees a perfect thread every time.
304 stainless is generally non‑magnetic. A very slight magnetic response can develop after cold working (like thread forming), but it’s negligible compared to ordinary steel. They are safe for use near electronics and sensitive instruments.
