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Fasten metal roofing, wall panels, and steel framing in one shot with these hex head self‑drilling Tek screws. The hardened drill point cuts through sheet metal and light‑gauge steel without a pilot hole, while the external hex flange head delivers high torque with a standard socket — no cam‑out, no stripped heads. Choose 410 stainless steel when you need extra hardness and wear resistance, or A2 / 304 stainless for superior corrosion protection in coastal, humid, or outdoor environments. The wide flange provides a washer‑like bearing surface that prevents pull‑through and distributes clamp load evenly. Ideal for roofing, wall panels, composite panels, light steel keel, C‑beam connections, air‑conditioning brackets, solar panel mounting, containers, movable rooms, advertising signboards, and DIY garage or fence assembly.
| Typical Sizes | Thread Diameter | Available Lengths (mm)* | Head Style | Drive | Material Options | Corrosion Resistance |
|---|---|---|---|---|---|---|
| M4.2 | 4.2 mm | 13, 16, 19, 25, 32, 38, 50 | Hex Flange Head | External Hex (8 mm) | 410 Stainless / A2 304 Stainless | 410: Good / A2: Excellent |
| M4.8 | 4.8 mm | 13, 16, 19, 25, 38, 50 | Hex Flange Head | External Hex (8 mm) | 410 Stainless / A2 304 Stainless | 410: Good / A2: Excellent |
| M5.2 | 5.2 mm | 16, 19, 25, 32, 38, 50, 60 | Hex Flange Head | External Hex (10 mm) | 410 Stainless / A2 304 Stainless | 410: Good / A2: Excellent |
| M6.3 | 6.3 mm | 19, 25, 32, 38, 50, 60 | Hex Flange Head | External Hex (10 mm) | 410 Stainless / A2 304 Stainless | 410: Good / A2: Excellent |
* Lengths are thread length only (not including head). Exact sizes vary by listing selection. Choose the material and size from the drop‑down menu. Typical socket sizes are indicated.
No. The self‑drilling Tek tip cuts through sheet metal up to approximately 2 mm thick without a pilot hole. For thicker gauge steel or very hard materials, a small pilot hole may help, but in standard roofing, siding, and framing applications, they are truly one‑step fasteners.
410 stainless is harder and offers higher strength; it is a good choice when drill‑tip life and budget are priorities, and it handles most outdoor environments. A2 / 304 stainless provides superior corrosion resistance, especially in coastal, humid, or chemical‑exposed conditions. If the fasteners will face constant salt air or damp, A2 is the better long‑term choice.
M4.2 and M4.8 screws typically use an 8 mm (5/16″) hex socket. M5.2 and M6.3 screws usually require a 10 mm socket. A magnetic nut driver greatly speeds up installation and helps hold the screw on the bit.
Yes. The self‑drilling tip penetrates the metal skin, then the thread bites firmly into the wood or composite substrate beneath. They’re commonly used for fixing metal roofing to timber purlins, as well as composite wall panels and C‑beam steel frames.
