... -80,J-55 and K-55 P-110 2.Casing joining coupling and tubing coupling 3.STC.LTC.BTC ... and other down well toolsOur company manufactures and sells casing and tubing couplings,pup joints, tool joints, adapter ... quality and competitive price products.Have all grade of API standard for thread also.Grade,J/K55,L/ ... – 114.3mmWall thickness,4.83-6.88 mmEUE,NUESize of Casing ,4 1/2 "- 20."Outside diameter ,114.3 ...