Size8/ 3/8" 212.7mmPin shank size4 1/2regBit typeHJ117IADC Code117types of bearingjounmal ...
ChinaCOMPANY PROFILEHejian Huanyu Petroleum Machinery Co., Ltd. Was established in 1998,located in Hejian which is in the middle of Cangzhou ci...
China1.Bit name:insert bit,rock bit,TCI Tricone bit,drilling bit Main structure features2. journal bearing. hardfaced head bearing surface. cone b...
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