Em 5/8/2010 15:46, V G escreveu:
> Hi all,
>
> I'm going to be using hex standoffs to stack PCBs on top of each
> other. These hex standoffs use M3 screws which I have found to use
> screws 3 mm in diameter. For drilling holes appropriate for these
> screws, I have chosen to use tungsten carbide drill bits. Should I
> select a drill bit exactly 3 mm in diameter (such as this one:
> http://cgi.ebay.ca/Tungsten-Carbide-Multipurpose-Drill-Bit-3mm-/160439853=
750?cmd=3DViewItem&pt=3DUK_Home_Garden_PowerTools_SM&hash=3Ditem255af5e2b6#=
ht_673wt_913)
> or should I select something slightly larger? The question is: will
> the screw slide through if I use a drill bit exactly 3 mm in diameter?

A 3mm diameter drill should be OK. 3mm is the diameter of the stock that
is used to make the screw.

If you want to tap a hole for the screw, use a 2.5mm drill bit.

Isaac

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