Increasing demands in terms of security and product durability increasingly call for the use of high quality steel fasteners in industrial construction. Quite often, a range of different steel hardness grades are used on site.
Conventional thread-forming screws may not thread form in these harder steel. Often the threads will collapse during installation and become extremely difficult to use.
But it’s no problem for SFS thread- forming fasteners, which maintain their complete functionality in every steel grade from S 235 to S 355.
Many application problems can be eliminated by the use of TDB-S fasteners.
For instance, pilot hole can be used for every steel grade. Thread collapse in hard grade steel is eliminated so there are no need to change pilot hole sizes.
By optimizing the production process of the TDB-S, it has been possible to further extend the application range of this widely used thread-forming fastener.
This makes the TDB-S the ideal choice for any steel support structure from S 235 (ST37) to S 355 (ST 52).