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Get the best of both worlds: a hex head you can drive with a wrench or socket, and a deep Phillips recess for a screwdriver. These A2 / 304 stainless steel self‑tapping screws feature a built‑in flange that acts like an integrated washer – it spreads the clamp load over a wider area to stop thin sheet metal from crushing or pulling through. The sharp, fully‑threaded shank bores its own tight thread into steel, aluminum, plastic, and wood panels without a pilot hole in most thin materials, saving you time on every connection. Covering the four most‑used metric diameters (M3, M4, M5, M6) and lengths from 6 mm to 40 mm, this series is a problem‑solver for sheet metal enclosures, automotive brackets, outdoor equipment, furniture assembly, and any job where rust‑free strength matters.
| Size | Thread Diameter | Available Lengths (mm)* | Head Style | Drive | Material & Finish |
|---|---|---|---|---|---|
| M3 | 3.0 mm | 6, 8, 10, 12, 16, 20 | Hex Flange (with Phillips recess) | Hex Socket & Phillips | A2 304 Stainless Steel, Plain |
| M4 | 4.0 mm | 12, 16, 20, 25, 30 | Hex Flange (with Phillips recess) | Hex Socket & Phillips | A2 304 Stainless Steel, Plain |
| M5 | 5.0 mm | 12, 16, 20, 25, 30, 35, 40 | Hex Flange (with Phillips recess) | Hex Socket & Phillips | A2 304 Stainless Steel, Plain |
| M6 | 6.0 mm | 16, 20, 25, 30, 35, 40 | Hex Flange (with Phillips recess) | Hex Socket & Phillips | A2 304 Stainless Steel, Plain |
* Lengths are measured from under the flange (thread only). Head height and flange thickness are additional. All screws are fully threaded. Metric coarse thread.
Yes. The hex flange head lets you use a standard socket or open‑end wrench for high torque, and the deep Phillips recess lets you drive with a screwdriver when space is limited or a socket isn’t practical. Choose whichever tool makes your job easier.
These screws are designed to self‑tap into sheet metal up to about 0.025″ (0.6 mm) thick without a pilot hole. For thicker material or hard alloys, a small pilot hole (roughly 80% of the thread diameter) will reduce driving torque and give you the cleanest thread.
The flange acts like a built‑in washer. It widens the bearing surface so the head doesn’t sink into or crush thin metal, plastic, or wood. It also distributes clamp load more evenly than a standard pan head, giving you a tighter, safer joint.
A2 / 304 stainless is highly corrosion‑resistant. It’s the standard for outdoor, marine, and coastal environments. It won’t develop red rust like carbon steel. For permanent saltwater submersion, you’d step up to 316, but for rain, humidity, and general outdoor use, A2 is perfectly suited.
All lengths listed are the thread length only, measured from directly under the flange to the tip. Head height and flange thickness are not included. This makes it easy to match the screw to the exact thickness of the material you’re fastening.
