Screw/Fix PCB

[PerranOak]

I need to screw (I guess) my battery holder (4xAAA) to my PCB.

The holder already has two countersunk holes of diameter 3.2mm.

What is the normal was to do it? Is the best solution to have a hole put in the PCB then use a self-tapper or use some kind of tiny bolt?

Either way, what make/model of screw/bolt should I use?

Thanks.

[soldar]

Countersunk M3 should work for the holder. Depending on the PCB material and the holding needs maybe it will get a grip on the board. If you can use a nut on the other side that solves it.

And you can always use glue.

[Benta]

Self tapping M3 into a non-plated 2.6 mm hole in the PCB (provided it's FR-4).

[PerranOak]

Cheers both.

FR-4?

[mdszy]

Cheers both.

FR-4?

FR-4 is the fiberglass material that most PCBs are made out of.

[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.