According to Honda CB500 K0 schematics, the rear wheel sprocket hex nuts are 10mm. I order OEM Honda nuts and they are too big. I went to the hardware store and got 10M nuts and they're too small. 7/16 seems to work the best, but the threads are a little wide and they are pretty snug, probably could force it, but don't want to risk it.
Any ideas? Do they make a 11M fine thread metric nuts?