Timco Self-Drilling Screws - 5.5 x 25mm - Silver
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Product Information
Full details
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.
All features
| Colour | Silver |
|---|---|
| Model Part Number | ZL25W16 |
| Brand | Timco |
Extended Product Information
FAQs
Do I need to pre-drill holes?
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.
Can I use these for coastal projects?
These screws are intended for clean, dry environments. They are not recommended for harsh coastal environments due to the risk of accelerated corrosion.
What is the function of the EPDM washer?
The EPDM washer acts as a gasket, compressing against the roofing sheet to create a weather-resistant, watertight seal.
What is the maximum steel thickness this screw can handle?
These screws are rated for light-section steel up to a maximum thickness of 5.0mm.
How many screws are included in a pack?
Each pack contains 100 individual self-drilling screws.
Troubleshooting
Screw struggling to penetrate steel
Verify that the steel thickness does not exceed 5.0mm and ensure the drill bit is sharp or in good condition.
EPDM washer is not sealing properly
Check that the screw is driven perpendicular to the surface and avoid over-tightening which can deform the washer.
Head stripping during installation
Ensure the hex-drive bit is the correct size and depth, and apply more downward pressure while maintaining a slower drill speed.
Pros and Cons
Pros
- Eliminates the need for pre-drilling pilot holes
- Includes EPDM washers for immediate weather sealing
- High-strength case and core hardened carbon steel
- Reliable, consistent performance in light-gauge steel applications
Cons
- Not suitable for high-corrosion environments like coastal zones
- Limited to steel thickness up to 5.0mm
- Requires a compatible power drill driver with depth control
Setup, Compatibility & Care
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.