construction machinery parts hitachi excavator pin and bushing for EX120,EX200

Ring bush for excavator arm and boom used.

1. Using 20CrMo steel as raw materials, which are provided by domestic famous manufacturer; 

forging again and again to make forming, to make internal organization more tight, and increase 

products’ wear-resistance. 

2. Using advanced CNC machine in strict accordance with products’ technical requirement to 

manufacture and ensure each position’s size which convenient to equip. 

3. Having 13 years international advanced heat treatment technology, using carburization treatment on 

them, guarantees their surface’s thickness of carburized layer and hardness; meanwhile good core .

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