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Standard pan head screws can pull through thin sheet metal or leave marks on soft wood surfaces when overtightened — a frustrating problem for HVAC installers, electronics assemblers, woodworkers, and DIY builders who need a reliable, low-profile fastener with a wider bearing surface. These Phillips modified truss head self-tapping screws in 304 stainless steel solve that problem with a wider dome head that spreads clamping load across a larger footprint, reducing pull-through without requiring a separate washer.
Each pack contains 304 stainless steel screws with a modified truss head (mushroom head) profile and self-tapping point, available in thread diameters from M2 to M4 and lengths from 4mm (≈5/32") to 20mm (≈3/4"). Quantity options range from 5 to 200 pieces per order, covering both small repair jobs and light production runs. The metric thread sizing follows ISO standards and is compatible with standard metric tooling.
Typical applications include thin sheet metal panel fastening, HVAC duct assembly, light wood and composite board joining, electronics enclosure assembly, and DIY projects where a corrosion-resistant fastener with a wide, low-profile head is needed. The 304 stainless finish also makes these suitable for outdoor and humid environments where carbon steel or zinc-plated screws would corrode over time.
| Drive Type | Phillips (Cross / PH) |
|---|---|
| Head Style | Modified Truss Head (Mushroom Head / Wide Round Head) |
| Point Type | Self-Tapping |
| Material | 304 Stainless Steel (A2 equivalent) |
| Surface Finish | Natural Stainless (no additional coating) |
| Thread Diameter | M2 / M2.3 / M2.6 / M3 / M4 — See variant options |
| Thread Length | 4mm (≈5/32") – 20mm (≈3/4") — See variant options |
| Quantity per Pack | 5 / 10 / 20 / 30 / 50 / 100 / 200 pcs — See variant options |
| Thread Standard | Metric (ISO) Self-Tapping |
| Corrosion Resistance | Good — suitable for indoor, humid, and light outdoor use |
| Recommended Driver Bit | PH0 (M2–M2.3) / PH1 (M2.3–M3) / PH2 (M3–M4) — Contact us to confirm |
| Application | Thin sheet metal, HVAC panels, light wood, composite board, electronics enclosures |
A general rule is to select a length that penetrates the base material by at least 2/3 of the screw’s total length. For example, when fastening a 3mm panel, a screw of 6mm (≈1/4") or longer is typically recommended. For thin sheet metal under 1.5mm, shorter lengths such as 4mm–6mm are generally sufficient. Available lengths range from 4mm (≈5/32") to 20mm (≈3/4") — see variant options above.
A modified truss head (also called a mushroom head or wide round head) has a wider, lower-profile dome compared to a standard pan head. The larger bearing surface distributes clamping force over a greater area, reducing pull-through risk on thin sheet metal and soft wood. It is generally preferred when the fastening surface is soft or when a larger contact footprint is needed without using a separate washer.
304 stainless steel self-tapping screws generally provide good tensile strength for light to medium-duty fastening in sheet metal, wood, and similar materials. They are not typically rated for heavy structural loads. For high-stress or high-vibration applications, a larger diameter or a higher-grade fastener is generally recommended.
Yes. 304 stainless steel offers good corrosion resistance suitable for most outdoor and humid indoor environments, and is generally resistant to rust under normal atmospheric conditions. For marine or highly corrosive environments, 316 stainless steel is typically the recommended choice.
Yes. These use a standard Phillips (cross) drive compatible with PH0, PH1, or PH2 bits depending on the screw diameter. Smaller sizes such as M2–M2.3 typically use PH0 or PH1 bits, while M2.6–M4 generally use PH1 or PH2. Any standard manual or power screwdriver with the correct bit size will work.
For thin sheet metal, these self-tapping screws are generally designed to cut their own threads without pre-drilling. For wood applications, a pilot hole is typically recommended to prevent splitting, especially in hardwoods or near the edge of a workpiece. The pilot hole diameter should be slightly smaller than the screw’s thread diameter.
For thin sheet metal (under 2mm), M2–M2.6 screws with shorter lengths (4–10mm) are typically used. For light wood panels and composite boards, M3–M4 with lengths of 10–20mm are generally more appropriate. Always verify the material thickness and required holding strength before selecting a size.
