What's the difference between self-drilling and fine thread plasterboard screws?
Fine thread screws have a sharp gimlet point that suits light gauge steel up to about 0.6mm. A self-drilling screw has a drill-bit style No.2 point that cuts through much thicker steel, up to 2.0mm here. If your stud or track is a heavier gauge, the fine screw will struggle and the self-drilling one won't.
Do I need to pre-drill before using these?
No. The self-drilling tip forms its own hole as you drive it, right through steel up to 2.0mm. That's the whole point of the screw. Just line it up and drive.
What's the maximum steel thickness these will drill?
The 3.5mm diameter screws drill into metal wall and ceiling track up to 2.0mm thick. Longer, thicker screws in the TIMCO range go further, but this size is rated to 2.0mm.
Can I use these outside?
No. They carry a Corrosion Rating of 1, which is for clean, dry interior conditions. For exterior or damp work you'll need a screw with a higher corrosion rating.
What driver bit do I need?
A Phillips PH2 bit. There's an S2 bit supplied in the box, so you're ready to go.
Are these fire rated?
Yes. They hold a Fire Classification of A1, meaning non-combustible, and they're manufactured to BS EN 14566:2008.