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    drill collar

    drill collar

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    Drill collars
    According to API Spec.7 and SY/T5144, drill collar is made of AISI 4145 modified chromium- molybdenum alloy steel. All threads are phosphated, copperized or cold rolled , and they are machined with CNC Lathes ¨CDouble ¨Cshoulderd, including some special threads. The maximum outer diameter of drill collars can amount to 14 inch.

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