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الشخص الذي يمكن الاتصال به Ms. andi
Chengliu, Jiyuan, Henan
According to API Spec.7 and SY/T***4, drill collar is made of AISI ***5 modified chromium- molybdenum alloy steel. All threads are phosphated, copperized or cold rolled , and they are machined with CNC Lathes –Double –shoulderd, including some special threads. The maximum outer diameter of drill collars can amount to *4 inch.
