Self drilling fixing capacity of a Z rail to 1.2mm thick SFS studs.

Thanks for your question. Your choice is someone limited and I suspect that you will need a self-tapping screw rather than self drilling which of course means pre drilling. . I would also query the use of a stainless steel screw in contact with a 1.2mm thick steel sheet , any moisture etc would cause erosion of the 1.2mm steel locally around the screw. Ignoring this fact then something along the lines of the SMP53S stainless steel self tapping could be an option as we have data for a base material l 1.13mm thick . Please see attached ETA annex 89 as a guide Note the values are characteristic and need to have the relevant partial safety factors applied as per the preamble.