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API Standard AISI 4145H Mod 6-1/2: Usage:Drill collars are used to provide weight on bit so that drill pipes are kept in tension. Especially drill collars can keep drill bits centralized and hole track by large rigidity Material: AISI ...

API Standard S135 5: Usage:As the major part of drill stem, drill pipe connected with Kelly and drill collar, which is used to put torque to drill bit and drill collar. Material:G105, S135, X95, Grade E ...

Cone Assembly of API Standard Tricone Rock Drill Bits Used for Mining: Item: Cone assembly of tricone rock drill bits Material: Alloy steel IADC code: IADC 537 and the above Usage: Mining Size: 8-1/2" ~ 26" (Tricone rock drill bits) Package: plywood case, individual ...

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API Standard AISI 4145H Mod 6-1/2