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HENAN WEIN INDUSTRY CO.,LTDChinaWeb Page Link: http://www.toboc.com/henanweinindustrycoltd755851
Drill pipe is made from alloy steel. Acc.to API Spec.5DP. All threads are phosphated, copperized or cold worked. All connections are equipped with pressed steel thread protectors. All threads are machined with CNC Lathes-Double-shouldered and special threads.
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HENAN WEIN INDUSTRY CO.,LTD