Oh I have a million left over parts and cables - even screws.
None of them are the right size!
Does anyone know which of the screws in the cyberguys link are for
motherboards?
The size of the screw used to secure the board to the
standoff depends on the size of the threads tapped into the
standoff.
"Most" are 6-32 tapped, roughly 1/4" or about 7mm.
Occasionally a case will come with standoffs tapped for 4-40
screws instead (as used on optical drives).
At some point you will need to decide if you want to use
several different types of essentially the same screws but
with different heads (flat, pan, or hex) or if you will
differentiate the screws per use. The flat headed ones
allow more clearance for areas like some slim OEM drive
rails, but being such a shallow head a screwdriver doesn't
grip them as well. They are not taped on the bottom as
you'd find on most flat (wood screws, etc) at the local
hardware store.
Since 6-32 isn't uncommon, a local hardware store is one
alternative for these screws. The cyberguys so-called
"sale" price for them isn't outragous, but some of their
prices for other fasteners are a bit steep - more looking
might result in a lot of savings if you're going to buy a
lot of them.
I can only assume that were cyberguys calls a screw course
it means 6-32, and fine, 4-40. It certainly seems to be the
case but it would have been nice had they used normal screw
conventions in their listings. With that in mind, the
following would be able to mount a board providing the
standoffs are tapped for 6-32 as mentioned previously.
http://www.cyberguys.com/templates/searchdetail.asp?productID=1321
http://www.cyberguys.com/templates/searchdetail.asp?productID=4424
http://www.cyberguys.com/templates/searchdetail.asp?productID=1324