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Get a clean, flush finish with these A2 / 304 stainless steel countersunk self‑tapping screws. The 90° flat head sits perfectly in a standard countersunk hole, leaving nothing to snag on wiring, clothing, or moving parts – ideal for sheet metal panels, electronic enclosures, automotive trim, and wood-to-metal connections. A sharp, full‑form coarse thread cuts its own path into steel, aluminum, plastic, fiberglass, and wood, eliminating the need for separate taps or nuts. Manufactured from genuine 304 stainless steel, they offer permanent corrosion resistance for indoor, outdoor, and damp environments without a surface coating that can chip. With seven metric diameters (M3 to M8) and an extensive length range from 6 mm up to 150 mm (including head), you can tackle everything from thin‑gauge electronics to structural brackets.
| Size | Thread Diameter | Typical Lengths (mm)* | Head Style | Drive | Material |
|---|---|---|---|---|---|
| M3 | 3.0 mm | 6, 8, 10, 12, 14, 16, 20, 25 | Countersunk Flat | Phillips | A2 304 Stainless |
| M3.5 | 3.5 mm | 8, 10, 12, 14, 16, 20, 25, 30 | Countersunk Flat | Phillips | A2 304 Stainless |
| M4 | 4.0 mm | 8, 10, 12, 14, 16, 20, 25, 30, 40 | Countersunk Flat | Phillips | A2 304 Stainless |
| M4.2 | 4.2 mm | 10, 13, 16, 19, 25, 32, 38, 50 | Countersunk Flat | Phillips | A2 304 Stainless |
| M5 | 5.0 mm | 12, 14, 16, 20, 25, 30, 40, 50, 60 | Countersunk Flat | Phillips | A2 304 Stainless |
| M6 | 6.0 mm | 16, 20, 25, 30, 40, 50, 60, 80 | Countersunk Flat | Phillips | A2 304 Stainless |
| M8 | 8.0 mm | 20, 25, 30, 40, 50, 60, 80, 100, 120, 150 | Countersunk Flat | Phillips | A2 304 Stainless |
* Lengths are overall length (including head). Exact length options vary per size – select from the listing variations. All dimensions conform to DIN 7982 / ISO 7050.
For a truly flush fit, yes – a countersunk hole matching the 90° head angle is best. In thin sheet metal or soft plastic, the head may pull itself flush without a separate operation. For harder materials, a quick countersink ensures the head sits perfectly flat.
Yes, all listed lengths are overall length – from the top of the flat head to the tip. This makes it easy to match the screw to your total material thickness without guessing.
They work well in all these materials. The sharp self‑tapping thread bites into hardwood, softwood, plastic, fiberglass, and sheet metal. For very hard materials, a pilot hole helps preserve the thread.
Absolutely. 304 (A2) stainless is the standard for outdoor and marine‑above‑waterline fasteners. It won’t red‑rust like carbon steel. For constant saltwater immersion, 316 would be preferable, but for rain, humidity, and general outdoor use, 304 performs beautifully for years.
