[jammi]

Usually the screw snaps in two at over-torquing before either the head or tool strips.

[hvidgaard]

I've had that happen a few times. It's super annoying, but that what you get when not paying for the quality screws.

[jammi]

Happens with the better ones as well, it's just a matter of setting the torque limiter of your screwdriver/coordless drill to match the job. Sometimes takes a few mistakes, but it's safer to start with a low setting and adjust up until you have the right torque for the screw.