... Co.,Ltd. as a seamless pipe manufacturer in the worldwide marketplace specializes in production of casing and tubing, line pipe and various other mechanical and ... ”,4”,4-1/2”GradeH40,J55,K55,N80API ConnectionsRound thread(STC and LTC),Buttress thread (BTC),NUE/EUELength RangeR1,R2,R3PackageAccording to customers ...