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When you need a fastener that won’t quit in wet, humid, or outdoor conditions, these A2 304 stainless steel self‑tapping screws deliver. The classic Phillips pan head sits clean and flush against the surface, while the sharp, deep thread cuts its own mating path into sheet metal, wood, plastic, and composites – no tap, no nut, just a pilot hole in most materials. From precision micro‑assemblies with M1 screws to medium‑duty structural connections at M8, this extensive size range covers everything from electronics, RC models, and appliances to automotive brackets, marine hardware, and outdoor construction. Genuine 304 stainless means no surface coating to wear off: the corrosion resistance is built into the metal, so even scratched threads stay rust‑free. Whether you’re a professional installer or a weekend DIYer, having a full 304 stainless assortment on hand means fewer callbacks, cleaner finishes, and peace of mind.
| Thread Spec. | Thread Diameter (d) | Head Diameter (dk) | Head Thickness (k) | Drive | Material & Finish |
|---|---|---|---|---|---|
| M1 | 1.0 mm | 1.75 mm | 0.65 mm | Phillips | A2 304 Stainless, Natural |
| M1.2 | 1.2 mm | 1.90 mm | 0.6 mm | Phillips | A2 304 Stainless, Natural |
| M1.4 | 1.4 mm | 2.30 mm | 0.8 mm | Phillips | A2 304 Stainless, Natural |
| M1.7 | 1.7 mm | 3.10 mm | 1.0 mm | Phillips | A2 304 Stainless, Natural |
| M2 | 2.0 mm | 3.40 mm | 1.3 mm | Phillips | A2 304 Stainless, Natural |
| M2.2 | 2.2 mm | 3.80 mm | 1.5 mm | Phillips | A2 304 Stainless, Natural |
| M2.6 | 2.6 mm | 4.20 mm | 1.7 mm | Phillips | A2 304 Stainless, Natural |
| M3 | 3.0 mm | 5.30 mm | 1.9 mm | Phillips | A2 304 Stainless, Natural |
| M3.5 | 3.5 mm | 6.40 mm | 2.1 mm | Phillips | A2 304 Stainless, Natural |
| M4 | 4.0 mm | 6.90 mm | 2.3 mm | Phillips | A2 304 Stainless, Natural |
| M4.2 | 4.2 mm | 7.80 mm | 2.4 mm | Phillips | A2 304 Stainless, Natural |
| M5 | 5.0 mm | 9.00 mm | 2.8 mm | Phillips | A2 304 Stainless, Natural |
| M5.5 | 5.5 mm | — | — | Phillips | A2 304 Stainless, Natural |
| M6 | 6.0 mm | 11.9 mm | 4.0 mm | Phillips | A2 304 Stainless, Natural |
| M8 | 8.0 mm | 13.0 mm | 5.0 mm | Phillips | A2 304 Stainless, Natural |
* Head dimensions for M5.5 are not listed in the standard chart; please refer to the product photos or contact us. Length options vary per size – select your desired length from the listing variations. All measurements conform to GB/T equivalent standards.
304 stainless is highly resistant to red rust. In normal outdoor, humid, and even coastal environments, it won’t corrode like carbon steel. It can develop light surface tea staining after prolonged salt spray, but this is easily rinsed off and does not affect strength. For permanent underwater or chemical immersion, 316 is recommended, but for 99% of workshop, automotive, and outdoor uses, 304 is the gold standard.
In thin sheet metal up to about 1 mm, you can often drive them directly. For thicker metals, hard plastics, or dense wood, a pilot hole around 80% of the thread diameter gives you the cleanest thread and reduces driving torque. The screw will then cut its own perfect mating thread.
No – all lengths are measured from directly under the pan head to the tip. This is the thread length only, making it easy to match the screw to your material thickness. For example, an M4×20 screw has 20 mm of thread engagement, excluding the head.
304 stainless is generally non‑magnetic in the annealed state. Some sizes may pick up a very weak magnetic pull after thread forming, but it’s negligible. They are safe around almost all electronics and sensitive equipment.
