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.
Installing window and door frames with plastic and aluminium profiles calls for a head shape that can withstand high pulling forces whilst not being too thick. Our flat countersunk head ticks both boxes. It finds its place on our SPAX-RA full-thread screw, which is used for the plug-free fastening of window and door frames. As you might expect, the T-STAR plus drive takes care of force application.
What this means for you: No more obstructive screw heads inside window and door frames.
The combination thread unites the best of two worlds in one single screw. While the lower half consists of a fine thread with self-drilling point, the thread below the head is a coarse thread. For instance, this important and helpful combination proves its worth on our FEX combi screw from the window construction range. It is used for the secure, simple fastening of metal fittings to plastic profiles with steel reinforcement. The fine thread secures the hold in the steel reinforcement, while the coarse thread offers increased protection against over-tightening, especially with thin-walled plastic profiles.
What this means for you: Just one single screw required for plastic/metal structures. No over-tightening on delicate profiles.
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.
Effective corrosion protection is a must for screws used for outdoor structures not exposed to the elements. For this, SPAX has developed the WIROX coating, which far outdoes conventional galvanisation in terms of both protection and durability. Our WIROX-coated screws are significantly more resistant to mechanical stress than their counterparts with chromate conversion coating. No chromium(VI) is used for WIROX, which means that even after years in an area not directly exposed to the elements, the screws are not only just as resilient, but are entirely environmentally friendly, too. Our WIROX screws are the ideal choice for all open structures without direct exposure to the elements, such as carports and pergolas. For areas with extreme weather exposure, such as decking, we continue to recommend our stainless-steel screws.
What this means for you: When you use our corrosion-protected screws outdoors, you can be safe in the knowledge that your structure is well fastened – in outdoor areas not directly exposed to the elements, WIROX keeps our screws statically rigid and reliably protected over many years. So there's no need for visual inspections every year!