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    spiral drill collar

    spiral drill collar

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    Spiral drill collars
    Based on API Spec.7 and SY/T5144, the spiral drill collars are made of 4145H modified chromium ¨Cmolybdenum alloy steel. All threads are phosphated, copper zed or cold rolled. All threads 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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