Threaded screw-in stud made of stainless steel / hot dip galvanised for grating fastenings on painted steel. The stud allows fast and easy single-operator installation with battery driven tools onto coated steel base material. There is no through penetration and no rework of the coating required. Minimum base material thickness 6 mm. The system holds the relevant offshore and onshore approvals and is suited for use in highly corrosive environment.