🔩 Product Overview: M3–M6 Phillips Truss Head Machine Screws – 316 Stainless Steel (Marine Grade)
When you need a wide, low‑profile head that won’t pull through soft materials and offers excellent corrosion resistance, these 316 stainless steel Phillips truss head machine screws are the perfect choice. 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, and wood. Made from marine‑grade 316 stainless steel (A4), they resist saltwater, chemicals, and humidity far better than standard 304. Available in M3, M4, M5, and M6 metric diameters with various lengths. Fully threaded with standard coarse pitch. Perfect for home appliances, office equipment, communication devices, ship assembly, and industrial machinery.
✨ Why Choose 316 Stainless Truss Head Phillips Screws
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316 stainless steel (A4 / marine grade) – Contains molybdenum for exceptional resistance to saltwater, chlorides, and industrial chemicals. Outperforms 304 in harsh environments.
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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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Phillips drive – Standard cross recess works with common PH1, PH2, or PH3 bits. Easy to install with manual or power tools.
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Metric sizes M3, M4, M5, M6 – Covers the most common diameters for appliances, electronics, machinery, and furniture.
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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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Wide application range – Home appliances, office equipment, communication devices, ship assembly, furniture, and general industrial fastening.
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Durable and long‑lasting – 316 stainless provides excellent oxidation and corrosion resistance, ensuring reliable performance in demanding environments.
📏 Technical Specifications – Truss Head Phillips Screws (316 Stainless)
| 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 |
| Material |
316 Stainless Steel (A4 / marine grade) |
| Thread Type |
Fully threaded, coarse pitch |
| Length Measurement |
Under head – from flat bearing surface to tip (head not included) |
| Length Options |
Various – select from product options (typical: 4–60mm) |
❓ FAQs – 316 Stainless Truss Head 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.
🔸 Will 316 stainless steel rust in saltwater or outdoor environments?
316 stainless (A4) is highly resistant to saltwater corrosion and is the go‑to choice for marine hardware, coastal construction, and chemical equipment. It outperforms 304 (A2) in harsh environments. While no metal is completely immune to crevice corrosion in stagnant, low‑oxygen conditions, 316 performs excellently for most marine and outdoor applications.
🔸 What Phillips screwdriver size works for M3 through M6?
M3: use PH1. M4: use PH1 or PH2. M5 and M6: use PH2. Using the correct size prevents stripping. A quality PH2 bit will handle M4–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 corrosion resistance, pair them with 316 stainless nuts.
🔸 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.
