MAIN   STRUCTURE   FEATURES

1.Journal  bearing.Hardfacedhead  bearing  surface.Inner  hole  of  cone  is  silver-plated.The  loadcapacity  and  seizure resistance of the bearing is greatly improved.

2.0 ring seal is made of the more wear resistant and high saturated buna-N with the increased seal section and precisely designed scaling flangein the cone sealing area has increased the reliability of the seal

3.All rubber compensator is used which can limit pressure differential and preventdilling fluidfrom entering the lubrication system and this provides the bearing system with good assurance of lubrication.

4.High wear resistance and excellent cutting abiity of the insert bit are given full play by using carbide compacts of high strength and high toughness in combination with optimized compact numbers androws,the exposure height and special shaped compacts.For steel tooth bit,the tooth surface is hard faced with new type of wear resistant material and thus has extended working life of the cutting structure while still maintaining high ROP.