M3 M3.5 M4 M4.2 Phillips Truss Head Self Tapping Screws – A2 304 Stainless Steel $2.30 USD

M3 M3.5 M4 M4.2 Phillips Truss Head Self Tapping Screws – A2 304 Stainless Steel

Name: M3 M3.5 M4 M4.2 Phillips Truss Head Self Tapping Screws – A2 304 Stainless Steel
Brand: HomeDIYer
SKU: AdaahSZBRT3010x10
Price: 2.3 USD
Availability: InStock

$2.30 USD

In stock

Provided by HomeDIYer

Quantity Discount Promotion

Thread Diameter:

Packing QTY (Piece):

Variant

Quantity:

Pickup currently unavailable at Illinois

Illinois

Pickup currently unavailable

150 Hastings Drive
Buffalo Grove IL 60089
United States

+18479091828

DIY Expert Support

Get fitment advice & recommendations

Mon-Fri, 8:30AM-8PM

WhatsApp Email

⚡

24-Hour Fast Ship

🚚

Arrives in 3-14 days

🌍

Global Reach

↩️

30-Day Returns

🌱 1 tree planted with every purchase

🔩 Truss Head Self‑Tapping Screws – A2 304 Stainless Steel (M3, M3.5, M4, M4.2)

A wider head means a stronger grip in thin material — that’s exactly what these Phillips truss head self‑tapping screws deliver. Made from genuine A2 / 304 stainless steel, they resist rust in humidity, rain, and mild chemicals without any coating that can wear off. The oversized truss head spreads clamping force across a larger area than a standard pan head, preventing pull‑through in sheet metal, plastic, and soft wood. Sharp, fully‑formed threads cut their own path as you drive, so there’s no need for a pre‑tap or pilot hole in most thin‑gauge materials. This series covers the four most‑requested small metric sizes: M3, M3.5, M4, and M4.2, giving you the exact fastener for electronics enclosures, automotive trim, brackets, and general‑shop repairs.

⚙️ Key Features – A2 Truss Head Self‑Tapping Screws

A2 / 304 stainless steel provides permanent corrosion resistance for outdoor, humid, and chemical‑exposed environments
Wide truss head distributes clamping load and resists pull‑through in thin sheet metal, plastic, and wood
Self‑tapping thread cuts its own mating thread — no pre‑tap or pilot hole needed in most applications
Phillips drive recess gives a secure, cam‑out‑resistant grip with standard screwdrivers
Available in four exact metric diameters: M3 (3.0 mm), M3.5 (3.5 mm), M4 (4.0 mm), and M4.2 (4.2 mm)
Fully threaded design with clean, burr‑free threads for consistent holding power
Ideal for electronics, automotive interior panels, light fixtures, furniture, and general sheet metal fabrication

📋 Technical Specifications – Truss Head Self‑Tapping Screws A2

Thread Spec.	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	6 – 30	Truss Head	Phillips	A2 304 Stainless Steel
M3.5	3.5 mm	—**	—**	8 – 35	Truss Head	Phillips	A2 304 Stainless Steel
M4	4.0 mm	8.7 mm	2.1 mm	8 – 40	Truss Head	Phillips	A2 304 Stainless Steel
M4.2	4.2 mm	8.8 mm	2.2 mm	10 – 50	Truss Head	Phillips	A2 304 Stainless Steel

* Length is thread length only (measured from under the head). Head dimensions for M3.5 are not in the standard chart — please refer to product photos or contact us for the exact values. All screws are fully threaded.

❓ Frequently Asked Questions – Truss Head Self‑Tapping Screws

🔸 What makes a truss head better than a pan head for thin metal?

A truss head has a larger, flatter bearing surface that spreads the clamping force wider. This stops the screw from pulling through thin sheet metal, plastic, or soft wood — often eliminating the need for a separate washer.

🔸 Do I need a pilot hole before driving these screws?

In thin sheet metal up to about 1.5 mm, you can usually self‑tap directly. For thicker steel or hard materials, a pilot hole about 80% of the thread diameter will reduce driving torque and ensure the cleanest thread engagement.

🔸 Will A2 stainless steel rust outdoors?

A2 / 304 stainless is highly resistant to red rust and is suitable for outdoor, marine‑above‑waterline, and humid environments. It won’t corrode like carbon steel. For constant saltwater submersion, 316 would be a better choice.

🔸 Are the lengths measured including the head?

No. All lengths are the thread length only, measured from directly under the head to the tip. This makes it easy to match the screw to your material thickness.