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When you’re fastening metal to metal or metal to wood, every extra step costs time. These self-drilling wafer head screws eliminate the need for a separate drill bit — the sharp, hardened point bores its own pilot hole while the thread taps tightly into sheet steel, aluminum, and composite panels. A low‑profile wafer head lays flat against the surface, spreading clamp load to prevent pull‑through in thin materials. Choose 304 stainless steel (A2) for superior rust resistance in outdoor, marine, and coastal applications. Opt for 410 stainless when higher hardness and wear resistance matter more. Or select galvanized carbon steel for a strong, economical option with solid zinc‑layer corrosion protection. With M4.2 and M4.8 diameters and lengths from 13 mm up to 50 mm, this range covers HVAC ductwork, metal roofing, trailer siding, auto body repair, and general steel framing — all with one drive and done.
| Size | Thread Diameter | Available Lengths (mm) | Head Style | Drive | Material Options | Corrosion Resistance |
|---|---|---|---|---|---|---|
| M4.2 | 4.2 mm | 13, 16, 19, 25, 32, 38, 50 | Wafer (Flat) | Hex | 304 Stainless / 410 Stainless / Carbon Steel Galvanized | 304: Marine grade — excellent 410: Limited — good for dry locations Galvanized: Moderate — suitable for outdoor covered use |
| M4.8 | 4.8 mm | 13, 16, 19, 25, 32, 38, 50 | Wafer (Flat) | Hex | 304 Stainless / 410 Stainless / Carbon Steel Galvanized | 304: Marine grade — excellent 410: Limited — good for dry locations Galvanized: Moderate — suitable for outdoor covered use |
* Lengths measured from under the head. Material grade is clearly marked on each pack. Refer to the size chart image in the listing for exact drill point dimensions.
304 stainless steel is the best choice for outdoor, marine, and coastal environments — it won’t red‑rust and resists corrosion in rain, salt air, and humidity. Galvanized carbon steel works well for covered outdoor spaces (under eaves, inside unheated buildings). 410 stainless is a harder material but offers less corrosion protection, so it’s better suited for indoor or dry applications where hardness matters more than rust resistance.
No. That’s the advantage of self-drilling screws — the tip acts like a small drill bit and cuts its own hole as you drive. They’ll punch through sheet metal up to approximately 1.5 mm to 2.0 mm thick without any pilot hole. For thicker material, consult the size chart to confirm the drill point capacity.
Both M4.2 and M4.8 screws in this range use a standard 8 mm (or 5/16‑inch) hex socket. A magnetic nut driver bit makes installation fast and keeps the screw from falling off the bit.
Yes. The self-drilling point goes through sheet metal and then bites into wood or composite material behind it. They are commonly used for attaching metal roofing sheets to timber purlins or fastening metal brackets to wood studs.
Yes. Each pack is labeled with the grade (e.g., 304, 410, or Galvanized Carbon Steel). The listing variation selector also allows you to pick the exact material and size combination, so you receive exactly what you order.
