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The Range£5.47Visit shop Unifix Twinthread Woodscrews Pozi Csk Head Bzp Ce 8G X 1.1/2" (4.0 X 40/30Mm) 9Tqtqcskpz/091 Box Of - Grey
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The Unifix Pozi Countersunk Twinthread Woodscrews are engineered for DIY enthusiasts and professionals seeking a reliable, heavy-duty fastener for wood joinery projects. Featuring a case-hardened steel construction and a corrosion-resistant bright zinc plated finish, these screws provide excellent grip and durability in various timber materials; however, users should ensure they use the correct pilot hole size in hardwoods to avoid material splitting.
| Colour | Grey |
|---|---|
| Model Part Number | 787611 |
| Brand | Unifix |
Yes, the bright zinc plated finish provides moderate corrosion resistance, though they are best suited for indoor or sheltered outdoor use.
While the twinthread design is sharp, using a pilot hole is recommended for hardwoods to prevent splitting and to ensure easier driving.
Pozi drive bits have additional small radial lines and are designed to resist cam-out better than Phillips bits. You must use a Pozi bit with these screws.
These are specifically designed as wood screws. They are not intended for direct use in metal surfaces without specific pre-drilling and threaded fasteners.
The zinc plating acts as a sacrificial barrier. Over many years in humid environments, it may begin to show white rust, but it is highly effective for standard construction applications.
Ensure the screwdriver bit is a true Pozi type and fits snugly; verify that the torque setting on the drill is not too high.
Drill an appropriate sized pilot hole before driving the screw, especially near the ends of timber boards.
Use a washer or a screw with a larger head diameter, or reduce the torque setting on your drill.
For optimal results, ensure you are using a high-quality Pozi drive bit that matches the screw size exactly to prevent cam-out and head stripping. When working with delicate veneers or thin timber, set your drill clutch to a lower torque setting. These screws are designed for wood joinery; they are not intended for use in masonry or metal without appropriate wall plugs or threaded inserts. To maintain their longevity, keep them in a dry environment to prevent moisture accumulation on the zinc plating. If using these screws outdoors in damp conditions, consider adding a sealant over the screw head to further protect against environmental moisture.
