Fixing and buying guide
A500408-ST-B Ulti-mate II Professional Woodscrew PoziSquare Double Csk Z & Y 5mm X 40mm - (10g) - 200 Box
What this screw is and who it is for
This is a professional-grade countersunk woodscrew with a PoziSquare recess, combining the benefits of Pozidriv and square drive systems. It is designed for carpenters, joiners, and experienced DIY users who require superior driving control and reduced risk of cam-out during installation. The screw is particularly suited to quality joinery work, furniture assembly, and applications involving hinges and fittings where precision and reliability matter.
- Double countersunk head self-sinks into timber without pre-drilling
- PoziSquare recess works with both PH and PZ drivers for flexibility
- Zinc yellow plated finish provides corrosion resistance for interior and protected exterior use
- No ribs on the shank make it ideal for use with hinges and hardware fittings
Key features and performance
The Ulti-mate II incorporates several advanced design features that set it apart from standard woodscrews. The reinforced double angle head is engineered for self-countersinking action, reducing the need for countersinking tools and minimising the risk of screw breakage under load. The slotted shank design reduces wood splitting by allowing controlled fibre displacement. The quick start point enables rapid starting with minimal force, improving productivity and reducing operator fatigue.
- State-of-the-art PoziSquare and acro anti-camout recess ensures stick-fit and stable driving
- Reinforced head resists breakage during installation and in service
- Slotted shank technology reduces splitting in hardwoods and softwoods
- Quick start point minimises driving force required for initial penetration
Sizing and pack contents
This product is supplied as a 5mm x 40mm screw in a box of 200 units. The 40mm length is suitable for joining timber components of moderate thickness, typically 25-30mm material with fastening into solid timber or engineered boards. The 5mm gauge provides a good balance between holding power and reduced splitting risk.
- Gauge: 5mm (suitable for general carpentry and joinery)
- Length: 40mm (appropriate for joining 25-30mm timber sections)
- Pack size: 200 screws per box
- Finish: Zinc yellow plated
Pre-installation checks and compatibility
Before use, ensure you have the correct driver type available. The PoziSquare recess accepts both Pozidriv (PH) and square drive (PZ) bits, offering flexibility in tool selection. Check that your timber is suitable for woodscrews and free from excessive knots or defects at the intended fixing points. For hardwoods or dense timbers, consider pre-drilling pilot holes to minimise splitting, even with the slotted shank design. Verify that the 40mm length is appropriate for your application and that the screw will not protrude through the far side of the timber.
- Compatible with PH (Pozidriv) and PZ (square drive) driver bits
- Suitable for softwoods, hardwoods, and engineered timber boards
- Pre-drill pilot holes in hardwoods or dense timbers to prevent splitting
- Confirm 40mm length is sufficient for your timber thickness and application