C31HD C30 BFZ70 And Customized CFA Coupling

C31 drilling bit, C30 holder and BFZ70 bucket teeth & holder are packing and ready to go.

We are able to make the customized CFA coupling. Raw material: 42Crmo. Forging CFA couplings: Tensile strength ≥1080MPa, yield strength ≥930MPa, hardness ≤217HB. Conventional heat treatment adopts quenching and tempering process (quenching temperature 840~900°C), and after treatment, it has high fatigue limit, impact resistance and low temperature toughness.