Street Address: Jiyuan
City: Jiaozuo
Province: Henan
Country/Region: China
Oil drilling
According to API Spec.7 and SY/T5144, the non-magnetic drill collars are made of low carbon stainless steel, which are researched and developed independently by our technical personnel. All threads are cold rolled, and they are machined with CNC Lathes –Double –shouldered, including some special threads.