On Tue, 2 Oct 2012, John Nagle wrote: > Small screws are usually 0.013" diameter, but they're > not modern 6-32. Are they 6-40? Whitworth? USS? Or what? > 6-40, 8-36 and others. There is a standard, National Fine, as opposed to National Coarse which brings us 6-32 and 8-32 and 10-24.