Question: are drywall screws self tapping?
Answer: Just when you thought you knew the difference between a drywall screw and a self-tapping screw, they come up with a self-tapping drywall screw, intended for installing drywall panels on light-gauge metal studs. If you're attaching drywall to heavy-gauge metal, look for self-drill/self-tapping drywall screws.