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Power Tools Direct£3.20Visit shop Timco Light Zl25w16 Self-Drilling Screws - Hex - For Section Steel - Zinc - With Epdm Washer 5.5 X 25 Bag 100
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B&Q£7.15Visit shop B&Q - Self-Drilling Light Section Silver Drill Screw With Epdm Washer5.5 X 25
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Designed for professionals and DIY enthusiasts, these Timco self-drilling screws are the ideal solution for fastening roofing sheets to light-gauge steel frameworks up to 5.0mm thick. They offer a significant time-saving benefit by eliminating the need for pre-drilling, though they are specifically intended for use in clean, dry environments rather than highly corrosive coastal or industrial areas.
| Colour | Silver |
|---|---|
| Model Part Number | ZL25W16 |
| Brand | Timco |
No, these screws feature a No.3 self-drilling point specifically designed to bypass the need for pre-drilling in steel up to 5.0mm thick.
These screws are intended for clean, dry environments. They are not recommended for harsh coastal environments due to the risk of accelerated corrosion.
The EPDM washer acts as a gasket, compressing against the roofing sheet to create a weather-resistant, watertight seal.
These screws are rated for light-section steel up to a maximum thickness of 5.0mm.
Each pack contains 100 individual self-drilling screws.
Verify that the steel thickness does not exceed 5.0mm and ensure the drill bit is sharp or in good condition.
Check that the screw is driven perpendicular to the surface and avoid over-tightening which can deform the washer.
Ensure the hex-drive bit is the correct size and depth, and apply more downward pressure while maintaining a slower drill speed.
For optimal results, ensure the steel sub-frame is clean and free of debris. Use an appropriate hex-drive bit that fits the screw head snugly to avoid cam-out. While these screws have a zinc finish, they should be stored in a dry, climate-controlled space to maintain their integrity before use. If you are working in an area prone to high humidity, consider applying a compatible sealant if the EPDM washer is not perfectly flush against the roofing material.
