1.OD:2 3/8"-6 5/8" 2.Grade:E,X,G,S 3.Upset:IU,EU,IEU 4.HB:Arnco100XT, ... strictly controlled processing of sulphur and phosphorus.To ensure the materials to meet even surpass the requirements of API ... and inspected with API Spec standard thread gauges. To improve the galling-resistance during initial break-in ... Drill pipes of our company are produced in accordance to Standards of API 5DP, API7 &7-1, NS ...