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Why for the love of track nuts can there not just be one standard size!
That would be too easy. There is one standard size, 15mm AF with M10×1.0 threads rear and M9×1.0 front. Then there's non-standard Campag 15mm AF and 10mm/9mm×26tpi, and non-standard Miche 14mm AF with metric threads. Americans use yet another size for BMX hubs, ⅜"×26tpi both ends, apart from the ones which use 14mm×1.0mm nuts or ⅜"×24tpi screws (also found on American Classic track hubs). That just leaves the M6×1.0mm (Novatec) M8×1.25mm (Goldtec rear) and M10×1.5mm (Hope) screws to worry about :-)
Yes, but that's cycling weirdness. Normal M10 nuts are 17mm AF, normal M8 screws are 13mm AF. In order to use the peanut butter wrench for both track nuts and crank bolts, special cycling nuts and screws are made with odd sizes.
You haven't answered the question; what's the thread size of the screws which you don't like?