M3 M4 Phillips Truss Head Self Tapping Screws – 304 Stainless Steel $6.38 USD

M3 M4 Phillips Truss Head Self Tapping Screws – 304 Stainless Steel

Name: M3 M4 Phillips Truss Head Self Tapping Screws – 304 Stainless Steel
Brand: HomeDIYer
SKU: A1140-0
Price: 6.38 USD
Availability: InStock

$6.38 USD

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🔩 Truss Head Self-Tappingg Screws – 304 Stainless Steel (M3 & M4)

When a standard fastener just won’t hold in thin material, the wide truss head on these 304 A2 stainless self-tapping screws makes the difference. The oversized bearing surface distributes clamp force across a larger area, preventing pull‑through in sheet metal, plastic, fiberglass, and wood panels. Because they’re self-tapping, you skip the tap and drive straight in — saving time on HVAC ductwork, automotive interior panels, marine hardware, and electronics enclosures. BRT Fasteners offers these in the two most commonly requested diameters, M3 and M4, giving you solid coverage for light‑ to medium‑duty assembly and repair without the cost of 316 stainless.

⚙️ Key Features – 304 A2 Truss Head Self Tapping Screws

304 A2 stainless steel withstands moisture, mild chemicals, and outdoor exposure without surface coating failure
Extra‑wide truss head prevents the screw from pulling through thin or soft materials
Self‑tapping thread cuts its own path in sheet metal, wood, plastic, and composite panels
Phillips drive recess ensures positive bit engagement and reduces cam‑out
Available in M3 and M4 diameters, the most versatile sizes for general fabrication and repair
Passivated surface arrives clean and oxide‑free, ready to install
Slightly magnetic after cold working, but safe for electronics and sensitive installations

📋 Technical Specifications – Truss Head Self-Tappingg Screws 304 Stainless

Size	Thread Diameter	Typical Length Range (mm)	Head Style	Drive	Material
M3	3.0 mm	10 – 40	Truss Head	Phillips	304 / A2 Stainless Steel
M4	4.0 mm	12 – 50	Truss Head	Phillips	304 / A2 Stainless Steel

* Lengths vary by pack selection. All screws are manufactured to GB/T dimensional standards.

❓ Frequently Asked Questions – 304 Stainless Truss Head Self-Tapping Screws

What makes the truss head different from a pan head?

A truss head has a noticeably wider, flatter bearing surface than a standard pan head. This spreads the clamping load over a larger area, which helps prevent the screw from pulling through thin sheet metal, soft plastic, or wood. It’s the go‑to choice when you need extra holding power without adding washers.

Do I need to drill a pilot hole first?

In thin materials, you can often drive them straight in without a pilot hole. For thicker steel, hard plastics, or dense hardwoods, we recommend drilling a hole about 80% of the screw diameter. This reduces driving torque and gives the cleanest thread engagement.

Is 304 stainless really rust‑proof?

304 A2 is highly resistant to corrosion in fresh water, humidity, and mild chemical environments, making it excellent for kitchen appliances, marine trim, and outdoor fixtures. It can develop light surface staining over time in harsh salt air, but won’t red‑rust like carbon steel. Rinsing occasionally keeps it bright.

Can I use these screws with wood?

Yes, they’ll bite into softwood and hardwood well. Because the thread is self-tapping rather than a traditional wood screw thread, you get a secure mechanical lock in all but the most brittle hardwoods. A pilot hole is recommended for very hard species.

Are these genuine BRT Fasteners products?

Definitely. Every order ships in BRT Fasteners branded packaging and passes a quality check for thread uniformity, hardness, and surface finish before it leaves our warehouse.