Tek Self Drilling Roofing Screws Metal to Heavy Steel Washered
From £4.94£5.93 EX VATINC VAT
Self drilling roofing tek screws for fixing metal sheet to heavy section steel up to 12mm thick. No pre-drilling needed. External corrosion resistant coating rated to 1500 hours salt-spray. Available in a full range of lengths from 32mm to 120mm.
| Size | QTY | Price | QTY |
|---|---|---|---|
| 5.5 x 32mm | 100 | £5.78£6.94 | |
| 5.5 x 38mm | 100 | £4.94£5.93 | |
| 5.5 x 51mm | 100 | £5.97£7.16 | |
| 5.5 x 60mm | 100 | £8.69£10.43 | |
| 5.5 x 65mm | 100 | £8.98£10.78 | |
| 5.5 x 80mm | 100 | £7.48£8.98 | |
| 5.5 x 100mm | 100 | £10.48£12.58 | |
| 5.5 x 120mm | 50 | £8.55£10.26 |
These roofing tek screws are designed for one job: fixing metal sheet directly into heavy section structural steel without any pre-drilling. If you have ever tried to drive a standard fixing into thick steel and watched it spin or snap, you will understand the value of a screw that actually does the drilling itself. These tek screws handle steel substrate up to 12mm thick, which covers the kind of heavy purlin and structural steel sections you encounter on commercial and agricultural roofing projects.
The self-drilling tip on these roofing tek screws cuts through the steel cleanly and pulls the fixing home in a single operation. That means fewer tools on the roof, faster installation, and no pilot hole stage to slow the job down. On a large sheet metal roof, the time saving is significant.
What Makes These Roofing Tek Screws Built for Exterior Use
The external coating is rated to resist 1500 hours of salt-spray testing. That is a meaningful figure on a roofing screw because the fixing sits exposed to weather for the life of the roof. Standard zinc-plated screws begin to corrode at the head and washer contact point within a few seasons, which can lead to discolouration streaking down the sheet and, eventually, loose fixings. The exterior plating on these screws provides a level of corrosion resistance suited to permanent outdoor installation, coastal proximity included.
Each screw comes with an integrated bonded washer. The washer creates a weather-tight seal at the point of penetration, compressing against the metal sheet to prevent water ingress. On a profiled metal roof, this is not optional — it is the difference between a weatherproof fixing and a potential leak point. The washer is bonded to the head, so it stays in position during drive-in and does not migrate or lose contact under the pressure of installation.
Available Lengths to Match Your Stack
The range covers eight lengths from 32mm up to 120mm, all at 5.5mm diameter. Shorter lengths suit single-skin or thin-profile sheet-to-purlin fixing where the steel is reasonably close to the surface. Longer lengths — the 80mm, 100mm and 120mm options — are for situations where insulation boards or deeper profiles sit between the sheet and the steel beneath. Choosing the right length ensures the drill tip fully engages the steel and the thread pulls the sheet tight without over-penetrating.
Sold in boxes of 50 or 100 depending on the length selected. For a full commercial roof, buying by the box keeps the cost per fixing sensible and means you are not rationing screws as you go. Running out halfway along a ridge on a windy Thursday is nobody’s idea of a productive afternoon.
These tek screws are a reliable, straightforward choice for metal roofing contractors, agricultural building installers, and steel building erectors who need a fixing that performs in the field without fuss.
Pro Tip: Always use a hex-head driver with a depth-sensitive nose piece when installing these screws: over-driving compresses the bonded washer past its sealing point and under-driving leaves the sheet rattling loose, so setting the clutch correctly before you start a run saves a lot of grief.
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