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small and very small screw identification

#1
Maybe a stupid question but I can't answer it with Google so it is time to ask.

There are lots of small screws and nuts used for mounting motors and other things. I can find size checkers for SAE that go down to #1 but I've come up short on the metric.

Do these exist? How do you guys identify small screws other than just knowing that X motor uses Y screws?

Any help much appreciated.
 
#3
Maybe a stupid question but I can't answer it with Google so it is time to ask.

There are lots of small screws and nuts used for mounting motors and other things. I can find size checkers for SAE that go down to #1 but I've come up short on the metric.

Do these exist? How do you guys identify small screws other than just knowing that X motor uses Y screws?

Any help much appreciated.
I just go to Lowe’s in the hardware section and compare screws until I get the right one:p