M3 M4 M5 M6 Truss Head Self Tapping Screws – 304 Stainless Steel, Natural Finish $1.97 USD

M3 M4 M5 M6 Truss Head Self Tapping Screws – 304 Stainless Steel, Natural Finish

Name: M3 M4 M5 M6 Truss Head Self Tapping Screws – 304 Stainless Steel, Natural Finish
Brand: HomeDIYer
SKU: TES0966x10
Price: 1.97 USD
Availability: InStock

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🔩 Truss Head Self‑Tapping Screws – 304 Stainless Steel (M3–M6)

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.

⚙️ Key Features – Truss Head Self‑Tapping Screws 304

Wide truss head distributes clamp load evenly and prevents pull‑through in sheet metal and plastics
Self‑tapping thread cuts directly into metal, wood, and composites — no tap or pilot hole needed in thin materials
304 (A2) stainless steel delivers excellent corrosion resistance for indoor, outdoor, and damp environments
Phillips drive recess gives a sure, cam‑out‑resistant engagement with common bits
Covers M3, M4, M5, and M6 diameters — the most popular sizes for light‑ to medium‑duty assembly
Natural stainless finish — no coating to wear off, the corrosion protection is built into the metal
Lengths from short to long to match your exact material stack‑up

📋 Technical Specifications – Truss Head Self‑Tapping Screws

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.

❓ Frequently Asked Questions – 304 Truss Head Self‑Tapping Screws

🔸 How is a truss head different from a pan head?

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.

🔸 Can I use these screws outside without worrying about rust?

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.

🔸 Do I need a pilot hole before driving these?

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.

🔸 Are the screws magnetic?

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.