Screw-Tite Pozi Countersunk Screw - Silver - 5.0 x 75mm

The Tri-Lock shank is designed to reduce timber damage upon insertion and provides enhanced resistance to loosening, allowing for closer-to-edge driving than traditional screw designs.

The zinc plating offers general corrosion resistance for common environments. For prolonged outdoor exposure or high-moisture areas, screws with a more robust coating like galvanization or stainless steel are recommended.

A Pozi drive (PZ) bit is required for these screws. Common sizes are PZ1, PZ2, and PZ3; PZ2 is typical for this screw diameter.

Yes, these screws can be used in masonry, but you must drill a pilot hole of the appropriate size and likely use a wall plug or anchor for secure fixing.

Pozi screws have four additional small slots between the main cross-slots, which provide better engagement with the driver bit and reduce cam-out (the bit slipping out of the screw head) compared to Phillips screws.

Ensure you drill a countersink hole in the material to the correct depth before driving the screw. The countersunk head will then sit flush or slightly below the surface.

They are suitable for most timbers, masonry, sheet steel, and plastics.

Ensure you are using the correct Pozi drive bit size and that it is fully engaged. Reduce driving torque or speed, or consider drilling a slightly larger pilot hole.

Ensure the pilot hole is straight and perpendicular to the surface. Hold the screwdriver or drill firmly and keep it aligned with the screw axis.

While the Tri-Lock shank minimizes damage, for very brittle timber or extremely close-to-edge driving, consider a slightly larger pilot hole or using a screw with a more specialized thread pattern.

Check if the material is too soft or if the pilot hole was too large. Ensure the screw has engaged sufficiently with the substrate. For some materials, a different screw type might be more appropriate.