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When a standard fastener just won’t hold in thin material, the wide truss head on these 304 A2 stainless self-tapping screws makes the difference. The oversized bearing surface distributes clamp force across a larger area, preventing pull‑through in sheet metal, plastic, fiberglass, and wood panels. Because they’re self-tapping, you skip the tap and drive straight in — saving time on HVAC ductwork, automotive interior panels, marine hardware, and electronics enclosures. BRT Fasteners offers these in the two most commonly requested diameters, M3 and M4, giving you solid coverage for light‑ to medium‑duty assembly and repair without the cost of 316 stainless.
| Size | Thread Diameter | Typical Length Range (mm) | Head Style | Drive | Material |
|---|---|---|---|---|---|
| M3 | 3.0 mm | 10 – 40 | Truss Head | Phillips | 304 / A2 Stainless Steel |
| M4 | 4.0 mm | 12 – 50 | Truss Head | Phillips | 304 / A2 Stainless Steel |
* Lengths vary by pack selection. All screws are manufactured to GB/T dimensional standards.
A truss head has a noticeably wider, flatter bearing surface than a standard pan head. This spreads the clamping load over a larger area, which helps prevent the screw from pulling through thin sheet metal, soft plastic, or wood. It’s the go‑to choice when you need extra holding power without adding washers.
In thin materials, you can often drive them straight in without a pilot hole. For thicker steel, hard plastics, or dense hardwoods, we recommend drilling a hole about 80% of the screw diameter. This reduces driving torque and gives the cleanest thread engagement.
304 A2 is highly resistant to corrosion in fresh water, humidity, and mild chemical environments, making it excellent for kitchen appliances, marine trim, and outdoor fixtures. It can develop light surface staining over time in harsh salt air, but won’t red‑rust like carbon steel. Rinsing occasionally keeps it bright.
Yes, they’ll bite into softwood and hardwood well. Because the thread is self-tapping rather than a traditional wood screw thread, you get a secure mechanical lock in all but the most brittle hardwoods. A pilot hole is recommended for very hard species.
Definitely. Every order ships in BRT Fasteners branded packaging and passes a quality check for thread uniformity, hardness, and surface finish before it leaves our warehouse.
