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Here's a screw chart for you... http://www.engineersedge.com/screw_threads_chart.htm you could ignore the minor diameter (the smallest diameter of the thread) and the pitch diameter (a theoretical diameter used in creating the thread profile). This chart contains more info than you asked for about the screw specification, but I thought it might interest you. It gives you all of the basic outer diameters of the screw threads. Find yourself a drill chart (just google "drill chart") and you'll find a list of drill sizes. If you think screw sizes are funky, wait until you see a drill chart. We have numbered, lettered, and fractional sizes, and they mix and mingle with each other in terms of sizes (I'm an engineer, and keep a huge chart on the wall - forget trying to remember them). And I haven't even brought up metric screws & drills yet.... (standards in engineering stuff is as bad as knowing what scale you're working in for the "G" scale guys!)
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