... : ±0.008mm6) Material: 42CrMo7) Nitrogen treatment8) Made by CNC machine 9) Packing:carton 10) Technological process:Process: Forging, Hobbing, Broaching, Heat ... , conical, helical tooth, drive shaft of all kinds as chain gear, long shaft, axis of a corn, worm, with a selection ... high than level 7. Price negotiated for high quantity. Industrial Gear