Spax universal screw, partially threaded, countersunk head, 3.5x45 T20, WIROX (200 pcs/box)

The typical SPAX T-STAR plus drive is a so-called internal hexagonal design. This shape increases the contact surface of the T-STAR plus screwdriver and ensures optimal positioning of T-STAR plus bits in the screw head. By enabling maximum power transmission from the screwdriver to the screw, T-STAR plus ensures simple and extremely fast work that is much more efficient than with other drive types.

The flat countersunk head has a multi-sided underside ("pockets") that mills its way into the wood, allowing it to be countersunk without pre-drilling the 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 fastened part. This creates maximum clamping pressure between the two. The unthreaded section should be at least as thick as the fastened component.

The term 4CUT refers to the arrow-shaped design of the screw tip. These edges displace the wood fibers as they are driven in and create space for the core diameter of the screw. Expansion of the wood core is reduced, which helps prevent splitting around the edges. The torque required from a cordless screwdriver is also reduced, since the screw core no longer has to "press" its way into the wood.

With WIROX, SPAX has developed a coating that provides significantly better corrosion protection than galvanization. WIROX does not use chromium(VI), which means that even after years in an area not directly exposed to the weather, the screws remain just as durable while 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 elements, such as decking, we recommend our stainless steel screws.