[zeroq]

It doesn't work like this.

Take aircrafts or (to some degree) a racing car. You need a screw. Sure you can get one at your local hardware shop for a penny, but for regulated market you need one with certification and that will cost you something close to $10. I know it's crazy but that's how it works.

[cbzoiav]

Difference being it doesn't fail and if it does you know exactly how it was made and under which process. There will be an investigation to see what went wrong - was it the screws fault or was more force placed on it than it was certified for.

Vs the one from the hardware store could have come from Alibaba and be a plastic core with a thin coating of metal for all you know.