SPAX universal screw pan head 5x40 T20 Wirox (500 pcs/pack)

The typical SPAX T-STAR plus drive is a hexalobular internal drive. This design increases the contact surface of the T-STAR plus screwdriver and ensures optimal seating of T-STAR plus bits in the screw head. By enabling maximum power transfer from the screwdriver to the screw, T-STAR plus guarantees simple and very fast work that is much more efficient than with other drive types.

The flat countersunk head features a polygonal underside ("pockets") that mills its way into the wood, allowing it to be countersunk without pre-drilling a pilot hole. The flat countersunk head sits flush with the surface.

Partially threaded screws are ideally suited for fastening thin components, such as wood-based panels, paneling, and floorboards, to thicker components such as rectangular timber or beams. The short thread penetrates the thicker component, while the unthreaded shank remains in the attached piece. This creates maximum clamping pressure between the two. The unthreaded section should be at least as thick as the attached component.

The term 4CUT refers to the arrow-shaped design of the screw tip. These edges displace the wood fibers as the screw is driven in and create space for the core diameter of the screw. This reduces expansion in the wood core, helping prevent splitting around the edges. It also reduces the torque required from a cordless screwdriver, since the screw core no longer has to "force" its way into the wood.

With WIROX, SPAX has developed a coating that offers significantly better corrosion protection than galvanization. WIROX does not use chromium(VI), which means that even after years in areas not directly exposed to the weather, the screws remain just as durable while also being fully environmentally friendly. WIROX screws are the ideal choice for all open structures that are not directly exposed to the weather, such as carports and pergolas. For areas that are directly exposed to the weather, such as decks, we recommend our stainless steel screws.