... 4,API 5CT-1043, API 5L-0699 Linzhou Fengbao Pipe Co.,Ltd. as a seamless pipe manufacturer in the worldwide marketplace specializes ... :2008 Quality system certification and API certification get passed. Manufacturing MethodHot rolled seamlessSize (OD)Casing:4-1/2”,5”, ... 4-1/2”GradeH40,J55,K55,N80API ConnectionsRound thread(STC and LTC),Buttress thread (BTC),NUE/EUELength RangeR1,R2,R3PackageAccording to ...