I have used a very strong axle design in a hub from US manufacturer's; Bullseye* (closed)

and Phil Wood, (still in San Jose California) the axles so much larger in thickness, than shimano's 10mm..

and its thick in the center , between the bearing races..

Its just inside of the drive side cone that common freewheel hubs break..

* machined hub flanges drilled for spokes screw onto a tube,
supports cartridge bearings outside Diameter.
axle end caps , bearings and spacers ,
around an axle thru the bearing ID is on the inside
it is reduced on the very ends to fit in the dropout width
bearing number is 6001..

tightening the QR compresses the stack to hold the end caps on ..
there are just small set screws so it does not come apart
when you take the wheel out..







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