8483.90.00 20 Transmission shafts (including cam shafts and crank shafts) and cranks; bearing housings and plain shaft bearings; gears and gearing; ball or roller screws; gear boxes and other speed changers, including torque converters; flywheels and pulleys, including pulley blocks; clutches and shaft couplings (including universal joints). - Toothed wheels, chain sprockets and other transmission elements presented separately; parts - Ball nut assemblies, "J" balls and ball screw assemblies, for fueling machines for nuclear energy; Toothed wheels; For use in the manufacture of the goods of this heading; Of transmission shafts and cranks, including cam shafts and crank shafts - Free AUT, NZT,