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OnBuy.com£8.49Visit shop A2-304 St/St Woodscrews Pozi Csk Head 4.0 X 50Mm - Q207997000400050000 - Box Of 200 5014196025919
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The Range£8.55Visit shop Unifix A2-304 St/St Woodscrews Pozi Csk Head 4.0 X 40Mm - Q207997000400040000 - Box Of 200 - Grey
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The Unifix A2-304 Stainless Steel Woodscrews are professional-grade fasteners designed for tradespeople and DIY enthusiasts who require high resistance to corrosion in outdoor or damp environments. These 5.0 x 25mm screws feature a precision Pozi countersunk head that ensures a flush, professional finish in various timber applications, though users should ensure they use the correct size driver bit to prevent cam-out during installation.
| Colour | Grey |
|---|---|
| Model Part Number | Q207997000500025000 |
| Brand | Unifix |
These are A2-304 stainless steel. While they offer excellent general corrosion resistance, they are not intended for direct marine or high-saline coastal environments. For those areas, A4-316 stainless is recommended.
It is highly recommended, especially when working with hardwood or thin sections of wood, to avoid splitting the material.
Pozi (Pozidriv) is an improvement on the standard Phillips drive, offering a more secure grip and reducing the likelihood of the driver bit slipping out (cam-out) during installation.
A2-304 stainless steel may exhibit very slight magnetic properties due to the manufacturing process, but this does not affect their corrosion resistance or mechanical strength.
Each box contains 200 individual screws.
Ensure you are using the correct size Pozi drive bit and apply consistent, firm downward pressure while driving.
Always pre-drill a pilot hole, especially when driving screws near the edge of a board or into dense hardwoods.
Reduce torque settings on your drill or use a lubricant like wax or soap on the threads before driving into dense timber.
To install, ensure your power driver or hand screwdriver is equipped with a compatible Pozi drive bit. For long-term performance, avoid using carbon steel drill bits when creating pilot holes in the same wood, as cross-contamination of metal particles can lead to surface rust. While A2-304 steel is highly durable, it should not be used in marine or heavy-salt environments, where A4 (316) stainless steel would be required instead. Keep the box in a dry area to prevent dust or moisture accumulation on the threads.
