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

 Main structure features:

Metal face seal journal bearing .New processes of head bearing hardfacing and cone bearing silver plating are used to improve the load capacity ,anti-galing ability and stability of the bearing .Various shapes of inerts can be equipped on this series of bits ,including scoop inserts wedge inserts ,conical -spherical inserts and double spherical in serts ,etc.Driling process&formation and bit are efficient integrated by scientific insert shape selection  to realizesafety and high efficient drilling

ZhongCheng Drill Bit Manufacture CO.,LTD

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