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When a standard pan head screw doesn't provide enough bearing surface — or when you need a fastener that sits low and distributes load across a wider footprint — nickel plated Phillips truss head machine screws are the go-to solution. Widely used in electronics assembly, panel mounting, and light fixture installation, these mushroom head bolts combine a broad, dome-shaped head with a familiar Phillips cross drive, making them easy to install with standard tooling while reducing pull-through risk in thinner or softer materials.
Each order includes machine screws with a truss (mushroom) head profile and Phillips cross recess, finished in nickel plating for a clean, corrosion-resistant appearance. Available in thread diameters M3 (3mm), M4 (4mm), M5 (5mm), and M6 (6mm), with lengths from 4mm (≈5/32") to 30mm (≈1-3/16"). Pack quantities range from 20 to 5,000 pieces per order, making this listing suitable for both small-batch projects and production-scale procurement.
These Phillips truss head machine screws are commonly used in electronics enclosures and PCB mounting where a low-profile head is needed, in sheet metal and thin panel assembly where the wide head prevents pull-through, and in light fixtures, appliance housings, and consumer product assembly where a finished nickel appearance is preferred alongside reliable metric thread engagement.
| Thread Standard | ISO Metric Coarse |
|---|---|
| Thread Diameters | M3, M4, M5, M6 |
| Lengths Available | 4mm (≈5/32") – 30mm (≈1-3/16") |
| Head Type | Truss Head (Mushroom Head) |
| Drive Type | Phillips Cross (PH) |
| Recommended Bit Size | PH1 (M3), PH2 (M4–M5), PH2/PH3 (M6) |
| Material | Carbon Steel (base) |
| Surface Finish | Nickel Plated |
| Pack Quantities | 20, 50, 100, 200, 500, 1000, 2000, 5000 pcs (see variant options) |
| Corrosion Resistance | Moderate — suitable for indoor and light humidity use |
| Thread Type | Machine thread (not self-tapping) |
| Country of Origin | Contact us to confirm |
Select the thread diameter (M3, M4, M5, or M6) to match your tapped hole or nut, then choose a length that passes through the material being fastened with enough thread engagement in the receiving part — typically at least 1.5× the thread diameter. For reference: 10mm ≈ 3/8", 16mm ≈ 5/8", 20mm ≈ 3/4", 30mm ≈ 1-3/16". The truss head's wide, low-profile design generally requires a slightly larger clearance hole than a pan head of the same diameter.
These are generally carbon steel screws with a nickel plating finish, typically suited for light to medium-duty fastening applications. Nickel plating does not significantly alter the base metal's tensile strength. For heavy structural or high-load applications, stainless steel or higher-grade alloy fasteners are generally recommended. Contact us to confirm the specific property class if required.
Nickel plating provides moderate corrosion resistance and is generally suitable for indoor use and light humidity. For prolonged outdoor exposure, wet environments, or coastal/marine conditions, stainless steel fasteners are typically a better choice. If used outdoors, applying a protective sealant over the fastener can help extend service life.
These screws use the ISO metric coarse thread standard (M3, M4, M5, M6), compatible with standard metric nuts, threaded inserts, and tapped holes per ISO 68-1. They are not compatible with UNC or UNF inch-thread fasteners.
A truss head (also called a mushroom head) has a wider, lower-profile dome compared to a pan head. The larger bearing surface distributes clamping load over a greater area, making it well-suited for softer materials, thin panels, and applications where pull-through resistance is important — such as electronics enclosures and sheet metal work. A pan head has a taller, narrower profile and is more common in general-purpose fastening.
Yes. These screws use a standard Phillips (PH) cross recess. Use the correct Phillips bit size for the screw diameter — generally PH1 for M3, PH2 for M4–M5, and PH2 or PH3 for M6. Using the wrong bit size increases the risk of cam-out and head damage, particularly when driving at higher torque.
These screws are available in quantities of 20, 50, 100, 200, 500, 1,000, 2,000, and 5,000 pieces depending on the size selected. For single projects or prototyping, 20–100 pcs is generally sufficient. For production runs, assembly lines, or ongoing workshop use, 500–5,000 pcs offers better per-unit value.
