[artdutra04]

Originally Posted by Yalib

I meant bearings... like http://www.andymark.com/product-p/am-0160.htm but for a hex shaft...

Why do you want the AM-0160 bearing hub (linked above) for hex shafts?

The AM-0160 bearing hub is designed to be used in a dead axle application (the shaft does not spin, and the sprockets are bolted directly to the wheel).

The only reason to switch to a hex shaft based design is to use them as live axles (the sprocket/gear/wheel all spin together with the shaft, with the bearings in your frame/chassis).