Pololu sells these nice Universal Aluminum Mounting Hubs for 6mm hex shafts, but I would like to buy the hex shaft itself:
Does anybody know where to buy it?
What do you mean by a "hex shaft"? Those hubs are intended for 6mm round or D shafts.
Oops, sorry, you're right! I guess I can't use them.
But I'm still looking for hex shafts with a 6mm diameter...
Have you tried ServoCity or McMaster-Carr?