What's the difference between coarse and fine thread drywall screws?
It comes down to what you're fixing into. Coarse thread screws, like these, are for plasterboard onto timber studs. The wide thread grips softwood and pulls in. Fine thread screws are for plasterboard onto metal studs. Match the thread to the stud and you'll get a clean, tight fix.
What gun do these fit?
They fit collated, auto-feed screwdriver systems. The screws come on strips of 50 and are compatible with all leading collated screw gun brands. You feed a strip in, and the gun advances the next screw for you as you go.
Can I use coarse thread screws on metal studs?
No. Coarse thread is for timber studs. On metal stud framing the coarse thread won't hold as it should, so use the fine thread drywall screw for that instead.
What size plasterboard screws do I need?
It depends on your board thickness. As a rule the screw should go at least 25mm into the timber stud behind the board. These are 3.5mm diameter and come in a range of lengths, so pick a length that clears the board and bites well into the stud. Drive until the head just dimples the surface without breaking the paper.
Are these screws suitable for outdoor use?
No. They carry a corrosion rating of 1, which means interior use only. For damp, exposed or external work you'll need a screw with a higher corrosion rating.
How many screws are in a box?
Each box holds 1000 screws, collated on strips of 50 ready for your gun.