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You’re assembling a grill, mounting a bracket, or repairing a piece of outdoor furniture – and you need screws that won’t rust after the first rain. These Phillips truss head machine screws are made from 201 stainless steel, so they resist corrosion and hold up in humid or mildly wet environments. The wide, low‑profile truss (mushroom) head distributes pressure evenly, making it perfect for sheet metal, plastic parts, or any application where you want a clean, finished look without countersinking. Choose from M4, M5, or M6 thread diameters, and pick the length you need – from 6mm up to 50mm (head length not included). Keep a stash in your workshop for projects that demand both strength and good looks.
| Parameter | Details |
|---|---|
| Product name | Phillips Truss Mushroom Head Machine Screws |
| Material | 201 Stainless Steel (SUS201) |
| Standard | GB/T (metric) |
| Thread diameters available | M4 (4mm), M5 (5mm), M6 (6mm) |
| Lengths available | 6mm – 50mm (head length not included – measured from under the head to tip) |
| Head style | Truss head (mushroom), low profile |
| Drive type | Phillips cross recess |
| Packaging | Plastic bag / box (varies by quantity) |
1. What is a truss head screw good for? Why choose it over a pan head or flat head?
A truss head (mushroom) has a wider, slightly domed top with a low height. It spreads clamping force over a larger area – great for thin sheet metal, plastic, or wood where you want to avoid pull‑through. Unlike a flat head, it doesn’t require countersinking. Compared to a pan head, it offers a larger bearing surface and a cleaner look.
2. Is 201 stainless steel rust‑proof enough for outdoor use?
201 stainless has good corrosion resistance for most outdoor applications (furniture, grills, fences, marine accessories). It’s less resistant than 304 or 316 in severe saltwater environments, but for general outdoor DIY and interior high‑humidity areas (bathrooms, kitchens), it’s perfectly fine. We recommend 304/316 for constant salt spray or chemical exposure.
3. How do I measure the length of a truss head screw?
For machine screws with truss heads, the length is measured from the underside of the head (the bearing surface) to the tip of the screw. The head itself is not included. So a “M5 x 10mm” screw has a 10mm threaded shaft under the head. Use a caliper for accuracy.
4. Can I use these screws with nuts or in tapped holes?
Yes – these are machine screws, meaning they have a uniform thread that’s designed to go into a threaded nut or a pre‑tapped hole. They are not self‑tapping. For sheet metal or plastic without threads, you’ll need a nut on the back or a threaded insert.
5. Do you sell washers or nuts that match these screws?
We currently sell screws only, but we recommend matching M4, M5, or M6 stainless steel nuts and flat washers from any hardware supplier. The thread pitch for metric M4 is 0.7mm, M5 is 0.8mm, and M6 is 1.0mm (standard coarse).
6. Are these screws magnetic?
201 stainless steel is generally non‑magnetic or very weakly magnetic, especially after cold working. They won’t stick strongly to a magnet, which is normal for austenitic stainless grades.
