Older shimano rear hubs have 9 1/4" balls and 10mm axle (which can measure as 9.5mm because of the threads). Maybe get cones from one of them?
I think Shimano uses 1mm threading (so 10 threads pr cm if you want to measure)
https://www.rosebikes.co.uk/bike-parts/hubs/accessories/hub-cones-&-balls
It is probably cheapest to just buy an appropriate shimano rear hub and use the axle, balls & cones from it.
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Older shimano rear hubs have 9 1/4" balls and 10mm axle (which can measure as 9.5mm because of the threads). Maybe get cones from one of them?
I think Shimano uses 1mm threading (so 10 threads pr cm if you want to measure)
https://www.rosebikes.co.uk/bike-parts/hubs/accessories/hub-cones-&-balls
It is probably cheapest to just buy an appropriate shimano rear hub and use the axle, balls & cones from it.