... .shaft:SF5-SF80 2.Material: SUJ2, S45C or Gcr15 3.Precision:g6 4.Induction hard and chrome plated 5.Hardness:58 ... automatic machine,such as Industrial Robot,Automatic Recording instrument,Computer,Precision Printers and so on.Optical axis can also extend the ... after heat treatment and hard chromic so that ensure the precision of product. Please send us your detailed special requirement ,you should ...