medium hard formation with high compressive strength,such as hard shale,limestone,sandstone,dolomite,etc

journal bearing .hardfaced head bearing surface .inner hole of cone is silver-plated.the load capacity and seizure resistance of the bearing is greatly improved.

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

All rubber compensator is used which can limit pressure differential and prevent drilling fluid from entering the lubrication system and this provides the bearing system with good    assurance of lubrication .

High wear resistance and excellent cutting ability 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 cuttingstructure while still maintainning high ROP.

ZhongCheng Drill Bit Manufacture CO.,LTD

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