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HENAN WEIN INDUSTRY CO.,LTDChinaWeb Page Link: http://www.toboc.com/henanweinindustrycoltd755851
The drill collars are made of 4145H modified chromium-molybdenum alloy steel acc.to API Spec.7 and SY/T 5144.All threads can be phosphated, copperized or cold worked. All threads are machined with CNC Lathes-Double-shouldered and special threads. And a special the max diameter of drill collar is 14 inch
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HENAN WEIN INDUSTRY CO.,LTD