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B&Q£4.44Visit shop B&Q - Double-Countersunk Yellow-Passivated Carbon Steel Screw (Dia)4.5mm (L)30mmPack Of 100
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This guide is for DIY enthusiasts and tradespeople needing reliable fasteners for plasterboard applications. The Diall Double-Countersunk Screws offer a secure hold and a flush finish, essential for a professional look. A key caveat is their recommendation for plasterboard, meaning they may not be ideal for all material types or heavy structural loads.
| Colour | Yellow |
|---|---|
| Brand | Diall |
These screws are primarily recommended for fixing plasterboard to timber or metal studs due to their double-countersunk design for a flush finish and good holding power in plasterboard.
No, the yellow zinc plating offers only moderate corrosion resistance and is not suitable for prolonged exposure to outdoor elements or damp conditions.
A pilot hole slightly smaller than the screw's shank diameter is generally recommended. For a 4.5mm screw, a 3mm or 3.5mm drill bit is often suitable for plasterboard, but testing on a scrap piece is advised.
Each pack contains 100 yellow zinc-plated double-countersunk wood screws.
These screws are best suited for light to moderate loads on plasterboard. For heavy items, it is recommended to locate wall studs for fixing or use appropriate heavy-duty wall anchors.
It means the head of the screw has a conical shape on both the top and underside. This allows the screw head to sit flush or even slightly below the surface of the material, providing a smoother finish.
Yes, because the screw head sits flush, it can be easily covered with filler and sanded smooth, allowing for a seamless finish when painting.
Ensure you have pre-drilled an adequate pilot hole. If the hole is too small, the head may not countersink properly. Check that the screwdriver bit is the correct size and engaging fully with the screw head.
The pilot hole may be too small, or excessive force is being applied. Try a slightly larger pilot hole or reduce the driving speed and torque on a power drill.
The pilot hole might be too large, or the plasterboard is damaged. For plasterboard, ensure you are screwing into the stud if possible for better support. If not, consider using appropriate plasterboard anchors in conjunction with the screw.
Use the correct size and type of screwdriver bit. Reduce the driving speed and pressure. If the head is already damaged, attempt to remove it with pliers if possible or drill it out and start again.
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