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Bolt sizes (dumb question)

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Minwah:

I am looking for some really small bolts for something I'm working on for my cable-less swappable panels.  Most websites list bolts in sizes like #6-32 or 1/4-20...but I haven't a clue what this means.  How can I determine the diameter of the bolt shaft from these figures?

BTW I understand metric sizes (M4, M8 etc.), but this is pretty alien to me.  Any help would be appreciated.

Samstag:

You can use this chart as a reference.

PileDriver:

Hi,
The first number is the diameter and the second is the threads per inch. 6,8,10 are small sizes (Under 1/4 inch). 6 being the smallest.
#6 has a diameter of 0.138. #8 = 0.164. #10 = 0.190. 1/4 and above are the diameter of the screw (1/4 is 1/4 or 0.250) Hope I explained this right.
Check here for a chart
http://www.engineersedge.com/screw_threads_chart.htm

Didn't catch Samstag's post sorry for the double info ;)

Minwah:

Thanks for the replies, that's exactly what I was looking for :)

Tiger-Heli:

Also, #4-40's are pretty common for electrical components, like probably what you use for making sure the VGA cable (or Printer cable) stays connected to the computer.

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