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Excavator Hitachi EX300-6 Track Link Assy
1. Track link
  1) Material: of MnB 35 or 40Mn2
  2) Heat Treatment: tone quality :30-36HRC + tread IF quenching :48-54HRC
3) Processing: Milling side - drill screw holes - red square - rough boring - heat treatment - Shot - testing - fine boring, ended mouth and chamfering

2. Bushing
  1) Material: bulldozer: 20CrMnTi
   By Excavator: 40CrB or 35CrMo
  2) Heat treatment process: Bulldozer: infiltration C + internal and external surface of the intermediate frequency quenching 54-60HRC.
   Excavator: 48-53HRC overall quenching.
3) Processing: cutting - flat head chamfering - heat treatment - cylindrical grinding

3. Pin
  1) Material: 50Mn
  2) Heat treatment process: Axis: quenched and tempered :25-30HRC + outer surface of the intermediate frequency quenching :54-60HRC.
3) Processing: cutting - flat head chamfering - heat treatment - cylindrical grinding
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