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Power Tools Direct£8.46Visit shop Timco Silver H38w16bb Self-Drilling Screws - Hex - For Heavy Section Steel - Exterior - With Epdm Washer 5.5 X 38 Timbag 100
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B&Q£14.62Visit shop B&Q - Self-Drilling Heavy Section Drill Screw Exterior Silver With Epdm Washer5.5 X 38
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The TIMco Self-Drilling Heavy Section Drill Screw is designed for professional contractors and metal fabricators who need a reliable, high-performance fastener for attaching materials to heavy-duty steel up to 12mm thick. Its primary benefit is the time-saving No.5 point that eliminates the need for pilot holes, though users should ensure they are using an impact driver with sufficient torque to handle these hardened steel fasteners effectively.
| Colour | Silver |
|---|---|
| Model Part Number | H38W16BB |
| Brand | TIMco |
While they will work, they are specifically engineered for heavy section steel (up to 12mm). For very thin sheets, a lower-numbered point might be more appropriate.
No, the No.5 point is designed to drill its own hole in steel up to 12mm thick.
The finish is tested to withstand 1,000 hours of salt spray, making it suitable for most urban and industrial environments.
The EPDM washer is provided to ensure a weather-resistant seal; it is recommended to keep it installed for all external applications.
A high-torque, low-speed industrial drill or an impact driver with controlled torque is recommended.
Check that the steel thickness does not exceed 12mm and ensure your drill speed is set to a low, high-torque mode.
Ensure the hex socket bit is not worn and is fully seated on the screw head before applying torque.
Do not overtighten the screw; the washer should be compressed sufficiently to create a seal without being crushed or distorted.
To ensure a successful installation, verify the steel thickness does not exceed 12mm. Always use an appropriately sized hex socket bit to avoid rounding the screw head. During storage, keep the screws in a dry area to prevent premature oxidation of the threads despite the protective coating. If the screws will be exposed to extreme environments, periodically inspect the EPDM washers for signs of hardening or degradation to maintain the weather-resistant seal. For best results, use these screws with compatible steel substrates only; do not attempt to use them in masonry or timber without proper pilot hole calculation.
