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Since the accepted answer consists only of a broken link (which is why link-only answers are so awful) and this question is ranked high by google, here's a late answer. Park Tool list a number of common sizes. 3/8 inch x 24 tpi Some solid axle bikes, including coaster brake 3/8 inch x 26 tpi Solid rear axle 10mm x 1mm Most quick release rear ...
First try your LBS, take the wheel with you. You might save yourself pain in the long run by swapping out the axle for a standard size thread.
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