Electronics > Projects, Designs, and Technical Stuff
Screw/Fix PCB
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Benta:
FR-4 is the term for the ubiquitous green fibreglass/Epoxy PCB material. My apologies for being "nerdy" here.

Bud:
I would not go with self tapping screws. Batteries are heavy, chances are good the screws will become lose with time and the holder will fall off. A countersink head screw and nut on the other side and perhaps a drop of threadlocking compound.
bd139:
I’d put down a pad with a big annular ring or a suitably sized hole depending on your preference and put a shake proof washer and nut on the bottom with an M3 countersunk scree through it all.
Benta:
My apologies. I used the wrong term.
What I actually meant was "thread cutting screw", thus my reference to M3.
Like these:
https://www.valuefastener.com/screws/thread-cutting-screws

They hold excellently in 1.6 mm FR-4, and 4 x AAA ain't heavy.


PerranOak:
Thank you all very much.
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