SPAX universal screw, countersunk head, 5x45 T20, Wirox

The typical SPAX T-STAR plus drive is a so-called internal six-lobe design. This shape 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 extremely fast work that is much more efficient than with other drive types.

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

Partially threaded screws are ideally suited for fastening thin components such as wood panels, cladding, and floorboards to thicker components such as rectangular timber beams or joists. The short thread penetrates the thick 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 screw’s core diameter. Expansion of the wood core is reduced, which helps prevent splitting around the edges. The required torque for a cordless screwdriver is also reduced, because the screw core no longer has to "force" its way into the wood.

With WIROX, SPAX has developed a coating that provides significantly better corrosion protection than galvanization. No chromium(VI) is used in WIROX, which means that even after years indoors or in areas not directly exposed to the weather, the screws remain highly durable while still 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 directly exposed to the weather, such as decks, we recommend our stainless steel screws.