How and where to use guide
A500408-ST-B Ulti-mate II Professional Woodscrew PoziSquare Double Csk Z & Y 5mm X 40mm - (10g) - 200 Box
Typical applications and where to use
These 5mm x 40mm countersunk woodscrews are particularly suited to hinge installation, fitting assembly, and general timber-to-timber joinery where a flush, professional finish is essential. The absence of ribs on this smaller size makes them ideal for use with hinges and fittings where clearance and neat appearance matter. The quick start point allows rapid engagement with minimum force, reducing fatigue on site. The zinc yellow plating provides corrosion resistance, making them suitable for both interior and exterior applications where moisture exposure is a concern.
- Hinge and fitting installation in doors, frames and cabinetry
- General timber assembly and joinery requiring countersunk heads
- Applications where a flush, professional finish is required
- Interior and exterior use with corrosion protection from zinc yellow plating
Driving and installation technique
The PoziSquare recess is self-centering and will drive with both PH (Phillips) and PZ (Pozidriv) drivers, offering flexibility on site. The state-of-the-art anti-camout design ensures stable, stick-fit driving without the bit slipping out of the recess during installation. The quick start point penetrates timber with minimal force, allowing you to position and start the screw accurately before applying full driving pressure. The reinforced double angle head self-countersinks as you drive, eliminating the need for separate countersinking and reducing installation time.
- Use PH or PZ driver bits that match the recess size for optimal engagement
- Position the screw and use the quick start point to begin driving with light pressure
- Drive steadily to allow the double angle head to self-countersink flush with the timber surface
- The anti-camout recess maintains bit contact throughout driving for reliable stick-fit performance
Preventing splitting and breakage
The slotted shank design reduces wood splitting by relieving stress along the fastener length, particularly important in softwoods and near timber edges. The reinforced double angle head is engineered to resist screw breakage during installation, even when driving into dense hardwoods or difficult grain patterns. Pre-drilling is recommended for hardwoods and when driving close to timber edges to further minimise splitting risk.
- The slotted shank relieves stress and reduces splitting in softwoods and hardwoods
- Pre-drill in hardwoods and near timber edges for best results
- The reinforced head design resists breakage under driving stress
- Avoid over-driving, which can cause head shear or timber damage
On-site storage and handling
Store screws in a dry environment to maintain the zinc yellow plating and prevent corrosion. The 200-box packaging is designed for trade use and site storage. Keep screws in their original packaging or a dry container to protect the finish, particularly on exterior projects. Check that driver bits are in good condition and properly seated in the PoziSquare recess before use to avoid damage to the recess and ensure reliable driving performance.
- Store in dry conditions to preserve zinc yellow corrosion protection
- Keep in original packaging or sealed containers on site
- Inspect driver bits regularly for wear or damage
- Discard any screws with damaged recesses or heads