SPAX 1197000400403 R 88091 Senkkopf T-STAR Wood screw 4 mm 40 mm T-Star Plus Stainless steel A2 200 pc(s)

The special force attack – T-STAR plus – is a so-called Torx inside. Compared to low-fitting drive types such as Philips or cross-head, the attack surface of our T-STAR plus is increased to a multiple, and the T-STAR plus bits are always optimally positioned in the screw head. The resulting best possible, precision-fitting power transfer from screwdriver to screw by T-STAR plus enables a simple and extremely fast working, and much more efficient than with all other drives.
The countersunk head (or also flat head) is the most frequently used head geometry in the SPAX-Universum. It has a tapered shape and is pronounced as a 90° MULTI-head on SPAX. Our countersunk screws offer the optimum compromise between the greatest possible resistance to the occurring head forces and the most discreet and visible screw connection possible. With its polygons base ("pockets") the countersunk head self-milled its fitting recess in the wood; therefore, it can be recessed perfectly into wood without additional lowering of the screw hole and then close flush with the surface.
In contrast to the partial thread, the full thread on most of our full thread screws extends over the entire or almost entire length from the tip to the head. The more threads a screw has, the larger the tensile and compressive forces that can be caught over these screws. This is particularly useful in structural timber construction, where full threaded screws are used for high-capacity wood joints.
Our term 4CUT for the tip of our screws describes the fact that this is shaped not round, but instead as square. These four edges squeeze the wood fibers out when screwing in, thus creating space for the core diameter of the screw. This effectively reduces the otherwise unavoidable spreading pressure exerted by the Kern in the wood and reduces the splicing of the wood near the edges. The necessary torque of the cordless screwdriver is also reduced, because the Kern of the screw does not have to "squeeze" itself into the wood.
The abbreviation A2 on our stainless steel screws is based on the alloy of HER steel. A stands for austenite, a mixture of iron, carbon and the alloy elements chrome, nickel and molybdenum. The 2 (1-5) indicates the degree of alloy, i.e. the content of chrome and nickel.
Screws in the stainless steel version A2 offer a high level of protection against corrosion and medium strength. Low, on the other hand, is their resistance to seawater and acids. For this reason, they are screwed in outdoor areas that are far from the coast and perform their service there for a long time and reliably.

This text is machine translated.