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Bit Size    8 1/2"(215.9MM)
Model    617

Application    
Suitable for roller bits core barrels for pile foundation construcation

Features    1.    Enhanced wear resistant gauge protection,increase the working life.
2.
2.    Hih temperature resistant rubber sealed bearing.
3.    Shirt-tail protected by tungsten carbide
4.    14mm chisel insert,strong tungsten carbide body,higher wear resistance,dill fast.
5.    Applicable rock hardness: ≥80Mpa

Main structure features:
  Optimal designs for various applicable formations, with different teeth shape,teeth height,and teeth placement,provide better drilling pefromance.

Individualized optimized design for bearing system guarantees and excellent performace of bearing capacity and a long working life.

Widely used in rotary drilling and HDD drilling markets,with high drilling efficiency.