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Skip the pilot hole and get a tighter, cleaner finish — these self‑drilling wafer head screws eliminate pre‑drilling so you can fasten metal to metal or metal to wood in one step. The wide, low‑profile wafer head spreads clamp force to prevent pull‑through in thin sheet metal, plastic panels, and wood, while the hardened drill tip bores through steel studs, roofing, and ductwork fast. Choose from three material grades to match your environment: A2 / 304 stainless for rust‑free outdoor and marine use, 410 stainless for higher hardness at a lower cost, or zinc‑plated carbon steel for dependable indoor performance. Available in M4.2 and M4.8 diameters with lengths from 13 mm to 50 mm, this range covers everything from HVAC ducting and metal roofing to automotive bodywork and general‑shop repairs.
| Size | Thread Diameter | Typical Lengths (mm)* | Head Style | Drive | Material & Finish Options |
|---|---|---|---|---|---|
| M4.2 | 4.2 mm | 13, 16, 19, 25, 32, 38, 50 | Wafer (Flat) Head | Phillips | A2 304 Stainless / 410 Stainless / Carbon Steel, Zinc Plated |
| M4.8 | 4.8 mm | 13, 16, 19, 25, 32, 38, 50 | Wafer (Flat) Head | Phillips | A2 304 Stainless / 410 Stainless / Carbon Steel, Zinc Plated |
* Lengths depend on the selected pack. Choose your preferred material and size from the listing variations. All screws are manufactured to metric standards.
Yes — the drill‑point tip is designed to penetrate sheet metal up to about 2 mm thick and wood without pre‑drilling. For thicker or harder materials, a small pilot hole can make driving easier, but in most common applications, they are true one‑step fasteners.
For outdoor, marine, or coastal environments, A2 / 304 stainless is the best choice — it won’t rust. 410 stainless is harder and offers good atmospheric corrosion resistance for mild outdoor use. Zinc‑plated carbon steel is the most economical and works well indoors or under cover.
Absolutely. The drill tip goes through the metal layer and bites into the wood substrate beneath. They’re commonly used for metal roofing to wood purlins, metal brackets to studs, and similar mixed‑material connections.
Both sizes generally use a #2 Phillips bit. A fresh, correctly‑fitting bit will reduce cam‑out and protect the head recess throughout the job.
