... 5/8" 2.Grade:E,X,G,S 3.Upset:IU,EU,IEU 4.HB:Arnco100XT ... developing upon producing various oil drilling tools including Drill Pipe, Drill Collar, Heavy Weight Drill Pipe, Kelly,Pup Joint ... the galling-resistance during initial break-in and drilling operation, all threads are also phosphated or coppered ... plastic steel thread protectors on the connections. Drill pipes of our company are produced in ...