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The Range£3.95Visit shop Unifix General Purpose Chippy Woodscrews 3.5 X 25Mm - 9Chippy/040 - Box Of 200 - Grey
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The Unifix General Purpose Chippy Woodscrews are essential hardware for DIY enthusiasts and professional woodworkers who require reliable, long-lasting fasteners for general construction projects. These screws are engineered with a Pozi Countersunk head to minimize cam-out and ensure a flush finish, though users should ensure they are using the correct Pozi-drive bit size to maximize the longevity of the screw head during repeated installations.
| Colour | Grey |
|---|---|
| Model Part Number | 9Chippy/125 |
| Brand | Unifix |
They feature a corrosion-resistant finish suitable for light indoor and protected outdoor environments, but are not rated for marine or heavy-weather exposure.
These screws require a Pozi-drive (PZ) bit, not a standard Phillips bit.
While not always necessary in soft woods, pilot holes are recommended to prevent splitting, especially when working near the edge of a board.
The countersunk head allows the screw to sit level with or below the surface of the wood, providing a flush, snag-free finish.
These are designed specifically for woodworking applications and may not provide the proper thread pitch or head style for standard drywall installation.
Ensure you are using the correct size Pozi bit and apply consistent, steady pressure while driving.
Drill a pilot hole slightly smaller than the diameter of the screw shank before driving the screw.
Check that the pilot hole is appropriate for the screw gauge and ensure the material is not excessively hard or knotted.
To ensure the best results, always select a Pozi-drive bit that matches the screw size exactly. Using an incorrectly sized bit is the leading cause of stripped heads. While the grey finish offers good protection against environmental moisture, it is recommended to keep screws in a dry, cool environment to prevent premature oxidation. For long-term storage, keep them in their original packaging to avoid cross-contamination with other metals that could lead to galvanic corrosion.
