How and where to use guide
A500903 Ulti-mate II Professional Woodscrew PoziSquare Double Csk Z&Y - (10g) 5mm X 90mm - 100
Typical applications and where to use
These 90mm screws are ideal for joining timber components of substantial thickness, including structural framing, floor joists, roof trusses, and heavy-duty carpentry. The self-countersunking double angle head makes them particularly effective for applications where the screw head must sit flush with the timber surface. The absence of ribs on smaller sizes makes them excellent for use with hinges, latches, and metal fittings where clearance is critical. The zinc yellow plating provides corrosion resistance suitable for both internal and external timber work.
- Structural timber assembly and framing
- Joinery and cabinet work requiring flush-mounted fasteners
- Hinge and fitting installation
- Heavy-duty carpentry where screw breakage resistance is important
- Internal and external timber applications
Driving and installation
The PoziSquare recess is self-centering and compatible with both PH (Phillips) and PZ (Pozidriv) drivers, offering flexibility on site. The quick start point allows rapid starting with minimum force, reducing operator fatigue and improving productivity. Use a correctly sized driver bit to ensure full engagement with the recess and prevent camout. The reinforced head design resists screw breakage during installation, even under high torque. Pre-drilling is recommended in hardwoods or near timber edges to prevent splitting, though the slotted shank design inherently reduces splitting risk compared to conventional screws.
- Select PH or PZ driver bit matching the recess size
- Position screw perpendicular to timber surface for optimal seating
- Use the quick start point to begin driving with minimal pressure
- Pre-drill in hardwoods, near edges, or close to existing fasteners
- Drive until the double angle head sits flush with the timber surface
Limitations and on-site considerations
These screws are designed specifically for timber and should not be used in masonry, metal, or composite materials without appropriate pilot holes and fastening systems. The 90mm length is suited to joining timbers of substantial thickness; for thinner sections or veneers, shorter lengths should be selected. Ensure the timber is dry or at equilibrium moisture content before fastening, as movement in wet timber may compromise the joint. The zinc yellow plating provides good corrosion resistance but is not suitable for highly aggressive environments such as coastal salt spray or chemically treated timber without additional protection.
- Timber-only application; not suitable for masonry or metal without adaptation
- Verify timber thickness is adequate for 90mm screw length
- Use in dry or equilibrium moisture timber for optimal performance
- Check compatibility with treated timber specifications if required
Maintenance and storage
Store screws in a dry environment to preserve the zinc yellow plating and prevent corrosion. Keep packaging sealed until use. On site, protect fasteners from prolonged exposure to moisture or harsh weather. Once installed, no maintenance is required; the zinc yellow plating will weather naturally over time. If screws are removed and reused, inspect the recess for damage and discard any with stripped or damaged drive slots.
- Store in dry conditions with packaging sealed
- Protect from site moisture and weather exposure
- Inspect recesses before reuse; discard damaged fasteners
- No ongoing maintenance required after installation