Fixing and buying guide
A500507-ST-B Ulti-mate II Professional Woodscrew PoziSquare Double Csk Z & Y 5mm X 50mm - (10g) - 200 Box
What this product is and who it is for
This is a professional-grade countersunk woodscrew engineered for applications requiring superior holding power and finish. The PoziSquare recess accepts both Phillips (PH) and Pozidriv (PZ) drivers, offering flexibility on site. It is ideal for carpenters, joiners, and experienced DIY users installing timber components, furniture assembly, and architectural joinery where screw visibility and clean countersinking matter. The zinc yellow plating provides corrosion resistance suitable for both interior and exterior timber work.
- 5mm diameter, 50mm length: suitable for fixing timber components 25-40mm thick
- Double countersunk head: self-sinking for flush finish without pre-drilling countersinks
- PoziSquare recess: works with standard PH and PZ screwdriver bits
- 200 screws per box: typical pack for trade and serious DIY projects
Key features and performance
The Ulti-mate II incorporates state-of-the-art anti-camout recess geometry and a quick-start point for rapid, stable driving with minimal force. The slotted shank reduces wood splitting during insertion, critical when fixing near edges or into dense timber. The reinforced double angle head resists breakage under high torque and self-countersinks without additional tools. Smaller sizes carry no ribs, making them compatible with hinges and metal fittings without interference.
- Anti-camout PoziSquare recess: prevents bit slip and ensures stick-fit control
- Quick-start point: reduces driving force and speeds installation
- Slotted shank: minimises splitting in hardwoods and near timber edges
- Zinc yellow plating: corrosion protection for durability
Preparation and fixing guidance
For best results, use a correctly sized PZ or PH screwdriver bit to match the recess. Pre-drill pilot holes in hardwoods or near edges to prevent splitting. The self-countersinking head means you do not need to create a countersink recess beforehand; drive the screw until the head sits flush with the timber surface. Ensure the timber is dry and free from debris. For exterior applications, allow the zinc plating to cure fully before exposure to weather.
- Use PZ2 or PH2 driver bit for optimal recess engagement
- Pilot hole recommended in hardwoods and within 50mm of timber edges
- Drive until head sits flush; do not over-tighten
- Suitable for softwoods and hardwoods up to medium density
Compatibility and storage
These screws are compatible with all standard timber species and engineered boards. They work with hinges, brackets, and metal fittings due to the rib-free design on smaller gauges. Store in a dry environment to maintain the zinc plating integrity. The 200-screw box is designed for efficient site use and storage on standard shelving.
- Compatible with softwoods, hardwoods, and plywood
- Suitable for use with hinges and metal fittings
- Keep dry to preserve corrosion resistance