In contrast to the single-slot drive, the cross recess drive (also known as a Phillips drive) offers the advantage that the screwdriver blade can no longer slip out to the side and cause damage to the workpiece. Due to the tapering of the inner flanks in the cross recess, however, an axial force occurs when the screw is tightened, which pushes the blade out of the drive. This phenomenon is also known as the cam-out effect. The cross recess H drive is also used on our window construction screws (FEX), since the screwing-in torque is not too high. What this means for you: A simple Phillips screwdriver is all you need to install your windows quickly and securely.
The bugle head is only found on very few screws. It is predominantly used on drywall screws for fastening plasterboard. The concave, bugle-shaped design of the head offers a large enough surface to powerfully pull the plasterboards towards the substructure without completely piercing the top layer of cardboard. This is important since only the cardboard offers sufficient pull-through resistance – the brittle plasterboard core can't. The screw heads are inserted into the cardboard layer at a depth of approx. 1 mm so that they can be filled flush with the surface. What this means for you: Simple and rapid dry lining, screws sit perfectly in the board surface.
In contrast to the partial thread, the full thread on most of our full-thread screws covers the entire – or most of – the screw length from tip to head. The more thread turn a screw has, the greater the tensile and compressive forces that can be absorbed by these screws. We make particular use of this in structural wood construction, where our full-thread screws are called upon for heavy-duty wood connections. What this means for you: Wood connections with full-thread screws offer maximum reliability when it comes to resilience, and there's no need to use any ugly zinc-plated fittings!
In some areas, wood attachments have to be fastened to metal substructures, such as with our SPAX aluminium decking screw or in dry lining. Since normal screws would quickly meet their limit against hard metal, our range also includes screws with a special drill point. From the outside, it is reminiscent of the point of a metal drill, with two small blades. The SPAX aluminium screw drills into aluminium with wall thicknesses up to 4 mm to enable the thread to furrow into the material. This makes them just as easy to insert as our wood construction screws. What this means for you: With wall thicknesses of 2 mm in metal and 4 mm in aluminium, there is no longer any need for the otherwise customary pre-drilling with a metal drill. No having to change bits, no thin metal drill bits breaking in the screw hole.
Phosphate coating involves the application of a well-adhering phosphate layer to steel components such as screws. Our phosphate-coated GIX screws are predominantly used in dry lining. They offer two advantages here: on the one hand, they don't absorb moisture like galvanised screws do – which means no dark staining on wall surfaces. On the other hand, phosphate-coated screw heads provide perfect adhesion for joint filler in the dry lining. What this means for you: Screw holes are very easy to fill in dry lining, resulting in perfect wall surfaces.