We just added Metric Shafting to our Actobotics line! These 4mm, 6mm, 8mm, 10mm,and 12mm diameter shafts are made from 303 stainless steel for superior strength andprecision. Rockwell hardness is 83B with a 10 RMS micron rated finish.
http://www.servocity.com/html/shafting.html
Check out our mounting hubs that work with these shafts!