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You’re bolting down a plastic panel, mounting a sign, or assembling a piece of outdoor furniture – and a standard pan head just doesn’t spread the load enough. These truss head screws have an extra‑wide, low‑profile head that distributes pressure over a larger area, preventing pull‑through in soft materials. Made from carbon steel with your choice of nickel or black zinc plating, they resist corrosion in everyday indoor and light outdoor use. The Phillips drive works with standard crosshead screwdrivers. Available in M4, M5, and M6 diameters with lengths from 4mm to 50mm (measured under the head). Fully threaded for maximum grip. Perfect for machinery guards, electronics enclosures, marine accessories, and general DIY where a wide, snag‑free head is needed.
| Thread Diameter | Thread Pitch (mm) | Length Range (mm, under head) * | Head Style | Drive | Finish Options |
|---|---|---|---|---|---|
| 📐 Length measured from underside of head to tip. Fully threaded. Select exact size and finish from dropdown. | |||||
| M4 | 0.7 | 4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50 |
Truss head (extra wide, low profile) |
Phillips |
Nickel plated or black zinc plated |
| M5 | 0.8 | 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50 | |||
| M6 | 1.0 | 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50 | |||
* Lengths are typical – exact availability may vary. Please allow minor manual measurement errors. Due to different shooting environments, actual product color may vary slightly from images.
| Finish | Appearance | Corrosion Resistance | Best For |
|---|---|---|---|
| Nickel plated | Bright silver, slightly shiny | Good – indoor use, light moisture | Furniture, appliances, visible hardware |
| Black zinc plated | Matte black, low glare | Moderate – indoor use, light moisture | Industrial equipment, dark‑colored assemblies, custom builds |
1. What’s the difference between a truss head and a pan head?
A truss head is wider and flatter than a pan head. It spreads clamping force over a larger area, which makes it ideal for soft materials like plastic, fiberglass, or thin sheet metal where a standard head might pull through. It also has a lower profile, reducing snag risk.
2. How do I measure the length of a truss head screw?
For truss head screws, length is measured from the underside of the head (the flat bearing surface) to the tip. The head itself is NOT included. So an “M5 x 10mm” screw has a 10mm long threaded shaft under the head.
3. Are these screws fully threaded?
Yes – all M4, M5, and M6 screws in this range (up to 50mm length) are fully threaded from under the head to the tip, giving you maximum grip even in shallow holes.
4. Will the finish rust? Can I use these screws outdoors?
Nickel and black zinc plating provide good corrosion resistance for indoor use and occasional light outdoor exposure (e.g., garden furniture, covered areas). For continuous outdoor or marine environments, we recommend stainless steel. For most workshop, furniture, and appliance applications, these are perfectly adequate.
5. What Phillips screwdriver size do I need for M4, M5, M6?
For M4, use a #1 Phillips. For M5 and M6, a #2 Phillips works best. Always use a driver that fits snugly to avoid cam‑out and head damage.
6. Can I use these screws with a nut? What size nut fits?
Yes – these are machine screws. Use standard metric nuts of the same thread size (e.g., M5 nut for M5 screw). They will also thread into pre‑tapped holes. They are not self‑tapping – for wood or plastic, use a threaded insert or nut on the back.
