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The Range£10.22Visit shop Unifix Self-Tapping Screws Pozi Flange Head Ab Bs 4174 Bzp 6G X 1" (3.5 X 25Mm) Versatile Fasteners - Grey
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Designed for DIY enthusiasts and trade professionals alike, the Unifix Self-Tapping Screws with Pozi Flange Head offer a reliable, high-performance solution for fastening components into wood or metal substrates. These screws are engineered to simplify installation through their self-tapping design and integrated flange head, which maximizes surface area for a secure grip, though users should ensure they use the correct pilot hole size in harder materials to prevent snapping.
| Colour | Silver |
|---|---|
| Model Part Number | 1263469 |
| Brand | Unifix |
They feature a bright zinc plating which offers light corrosion resistance; however, they are primarily intended for indoor use or protected exterior applications.
It is not recommended. These screws require a Pozi drive bit to ensure proper fit and prevent damage to the head, as Pozi and Phillips profiles are different.
While the self-tapping design is intended to create its own thread, drilling a pilot hole is advisable when working with dense hardwoods or thick gauge metals to prevent snapping.
The flange acts as a built-in washer, providing a wider bearing surface that increases clamping force and prevents the screw head from sinking too deep into the material.
This is a British Standard specification for self-tapping screws, ensuring that the dimensions, thread quality, and tensile strength meet established professional standards.
Ensure the pilot hole is the correct size for the gauge of the screw; if using a power driver, reduce speed to allow the threads to cut the metal effectively.
Check that the screwdriver bit is a true Pozi drive (PZ) bit and not a standard Phillips (PH) bit, as these are not interchangeable.
Ensure you are using a pilot hole roughly 80% of the screw shank diameter to reduce internal pressure on the wood fibers.
To ensure the best results, match the screw gauge and length to your material thickness. If you are fastening metal, ensure the pilot hole diameter is slightly smaller than the core diameter of the screw to facilitate the self-tapping process without damaging the material. When driving these into wood, consider a small pilot hole to prevent the wood from splitting, especially near edges.
Maintain these screws by keeping them in a dry environment to prolong the integrity of the zinc finish. If the screw head becomes stripped or damaged, do not continue driving, as this can make removal significantly more difficult later. Always wear safety glasses when driving screws into metal, as small shards can be displaced during the tapping process.
