1.Grade for L-80 .N-80,J-55 and K-55 P-110 2.Casing joining coupling and tubing coupling ... device of well, etc. We always do business based on the principle of equality and mutual benefit, we provide ... for thread also.Grade,J/K55,L/N80,P110Thread, BTC,LTC,STC.Size of Tubing , 2 3/8 " - 4 1/2" ... thickness,4.83-6.88 mmEUE,NUESize of Casing ,4 1/2 "- 20."Outside diameter ,114.3 - 508mmWall thickness, 5. ...