Self-Drilling Screw / Tek Screw — Metal Roofing & Cladding
Self-drilling screws (universally called 'Tek screws') drill their own pilot hole in metal as they are driven, eliminating the pilot drilling step. Standard for metal roofing and cladding installation onto steel framing. The point number indicates maximum drilling capacity — #2 drills up to 3 mm, #3 up to 4.5 mm, #5 up to 12 mm of steel.
Specifications
| Point Sizes | #1, #2, #3, #4, #5 (each handles specific maximum steel thickness) |
|---|---|
| Head Types | Hex washer (most common, for roofing), Pancake, Wafer, Pan |
| Drill Capacity | Up to ~12 mm steel for #5 point |
| Surface Finish | Zinc, Ruspert (roofing standard, ~1000 hr salt spray), Bi-metal (carbon steel point + stainless 304/316 body), Dacromet |
| Sealing Washer | EPDM bonded seal for roofing applications |
| RAL Colors | Painted heads in standard RAL colors for matching roof/cladding |
Frequently Asked Questions
What is a bi-metal Tek screw?
A bi-metal Tek screw has a hardened carbon-steel drill point (so it can drill steel) welded to a stainless steel body (so it provides long-term corrosion resistance). They cost more than standard Tek screws but are essential in coastal or aggressive environments where standard zinc or Ruspert won't last.
How do I choose the right point size?
Match the point to the total steel thickness being drilled (multiple layers added together). Always check the manufacturer's specification — a #2 point in a 4 mm steel beam will burn out before completing the hole. When in doubt, choose one size up.
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