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Seen a cracked royce flange in the flesh... the guy was not supposed to build it radial, but being a 20 holes hub, one would expect it to be an option...
It seems to me that my sample size is more representative of a few photos on the web of which we know very little... the large crack might be the result of a four feet jump with a bad landing... people on mountain bikes do crazy stuff with their bikes.
White industries or royce hubs have steel axles. Both are perfect.
A novatec d771 should be good enough but it has an alloy axle.