There are a bunch of both Metric and English threaded axles available. 10mm, 9.5mm, 9 mm, 3/8 inch, 5/16 inch, are just a few. There are no standards except what the manufacturer of the hub decides to use. Sturmey Archers are another story because they until bought a few years ago used a thread called Whitworth that was only used by the British. There is no answer to your question. You can buy a digital caliper and Metric and English thread guage for under $20 and have the correct answers. Roger