Made of AISI4145H alloy steel, drill collar mainly used between the dill pipe and drill head and connected by conversion connector so that they can provide the pressure and weighting to dill head ,i…
Making of AISI 4145H alloy steel, this is a kind of dill collar which add three right out of spiral groove on the outer circle of ordinary drill collar when processing. The main effect is to reduce t…
Made of AISI4145H alloy steel, drill collar mainly used between the dill pipe and drill head and connected by conversion connector so that they can provide the pressure and weighting to dill head ,i…
Making of AISI 4145H alloy steel, this is a kind of dill collar which add three right out of spiral groove on the outer circle of ordinary drill collar when processing. The main effect is to reduce t…
Made of AISI4145H alloy steel, drill collar mainly used between the dill pipe and drill head and connected by conversion connector so that they can provide the pressure and weighting to dill head ,i…
Making of AISI 4145H alloy steel, this is a kind of dill collar which add three right out of spiral groove on the outer circle of ordinary drill collar when processing. The main effect is to reduce t…
Made of AISI4145H alloy steel, drill collar mainly used between the dill pipe and drill head and connected by conversion connector so that they can provide the pressure and weighting to dill head ,i…
Making of AISI 4145H alloy steel, this is a kind of dill collar which add three right out of spiral groove on the outer circle of ordinary drill collar when processing. The main effect is to reduce t…
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