1.OD:2 3/8"-6 5/8" 2.Grade:E,X,G,S 3.Upset:IU,EU, ... by CNC Lathes and inspected with API Spec standard thread gauges. To improve the galling-resistance during initial break-in and ... , OHSAS 18001, Arnco Hardbanding Certificates and so on. 2 3/8--5 1/2 drill pipe