🔩 Product Overview: M3–M6 Truss Head Phillips Machine Screws – Carbon Steel, Zinc / Nickel Plated
Need a fastener with a wide bearing surface to prevent pull‑through in soft materials? These M3, M4, M5, and M6 truss head Phillips machine screws are made from carbon steel with a choice of zinc or nickel plating. The truss head (also known as a pan truss or wide‑bearing head) has a larger diameter and lower profile than a standard pan head, distributing clamping force over a wider area – ideal for plastic enclosures, sheet metal, wood, and furniture. The Phillips drive works with standard PH1 and PH2 bits for easy installation. Fully threaded with standard coarse metric pitch, and length is measured under the head. Choose zinc plating for bright silver corrosion resistance or nickel plating for a polished, durable finish. Perfect for appliances, electronics, industrial equipment, and general assembly.
✨ Why Choose These Truss Head Phillips Screws
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Truss head design (wide, low profile) – Larger bearing surface than pan head. Prevents pull‑through in soft materials like plastic, wood, and thin sheet metal.
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Carbon steel construction – Strong and durable for general fastening applications. Provides reliable clamping force.
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Zinc or nickel plating – Zinc offers bright silver corrosion resistance; nickel provides a polished, more durable finish with good rust protection.
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Phillips drive – Standard cross recess works with PH1 (M3/M4) or PH2 (M5/M6) bits. Easy to install with common tools.
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Metric sizes M3, M4, M5, M6 – Covers the most common diameters for electronics, appliances, furniture, and industrial machinery.
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Fully threaded, coarse metric pitch – Standard threads: M3x0.5, M4x0.7, M5x0.8, M6x1.0. Threads run the entire shank length for maximum grip.
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Length measured under head – Clear measurement: e.g., M6 x 30mm = 30mm threaded shank below head.
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Wide application range – Home appliances, electronics, office equipment, furniture, industrial machinery, and general assembly.
📏 Technical Specifications – Truss Head Phillips Screws (M3–M6)
| Specification |
M3 |
M4 |
M5 |
M6 |
| Thread Diameter (d) |
3mm |
4mm |
5mm |
6mm |
| Thread Pitch (p) |
0.5mm |
0.7mm |
0.8mm |
1.0mm |
| Head Style |
Truss head (wide, low‑profile, extra bearing surface) |
| Drive Style |
Phillips cross‑head (PH1 for M3/M4, PH2 for M5/M6) |
| Material |
Carbon steel |
| Plating Options |
Zinc plated (bright silver) or Nickel plated (polished silver) – select option |
| Thread Type |
Fully threaded, coarse pitch |
| Length Measurement |
Under head – from flat bearing surface to tip (head not included) |
| Standard |
GB/T |
❓ FAQs – Truss Head Phillips Screws
🔸 What is a truss head screw? How is it different from a pan head?
A truss head has a larger diameter and lower profile than a standard pan head. It provides a wider bearing surface, which helps prevent pull‑through in soft materials like plastic, wood, or thin sheet metal. The low profile also allows it to sit closer to the surface. For applications where a pan head might sink in or damage the material, a truss head is often the better choice.
🔸 How is length measured for these screws? Are they fully threaded?
Length is measured from the underside of the head (the flat bearing surface) to the tip, not including the truss head. Yes – they are fully threaded from just under the head to the tip. For example, an M5 x 20mm screw has a 20mm threaded shank.
🔸 Which plating should I choose – zinc or nickel?
Zinc plating offers bright silver corrosion resistance at a lower cost – suitable for most indoor applications. Nickel plating provides a more polished, durable finish with slightly better wear resistance and a brighter appearance. Both offer good protection against rust in normal indoor environments. For outdoor or high‑moisture use, consider stainless steel.
🔸 What Phillips screwdriver size works for M3 through M6?
M3 and M4: use PH1. M5 and M6: use PH2. Using the correct size prevents stripping. A quality PH2 bit will handle M5 and M6 comfortably.
🔸 Can I use these screws with nuts, or are they self‑tapping?
These are standard machine screws – they require a matching metric nut (M3–M6) or a pre‑tapped hole. They are not self‑tapping. For best results, pair with steel or stainless nuts of the same thread size.
🔸 What lengths are available for M3, M4, M5, and M6?
We offer various lengths – typical ranges: M3: 4–30mm, M4: 5–40mm, M5: 6–50mm, M6: 8–60mm. Please select your desired length from the dropdown options. If you need a length not listed, contact us.
