1.OD:2 3/8"-6 5/8" 2.Grade:E,X,G,S 3.Upset:IU,EU,IEU 4.HB:Arnco100XT,150XT,300XT, Botn1000,3000 5.IPC:TC2000,TK34 ... the weld-neck region ensures the drill pipes are of no defects. All threads are machined by CNC Lathes and inspected ... &7-1, NS-1. RUSSIA RTN, RUSSIA GOST-R, ISO 9001,ISO 14001, OHSAS 18001, Arnco Hardbanding Certificates and so on. 2 3/8--5 1/2 drill ...