... P-110 2.Casing joining coupling and tubing coupling 3.STC.LTC.BTC ,Premuin connection We have more ... other down well toolsOur company manufactures and sells casing and tubing couplings,pup joints, tool joints, ... products.Have all grade of API standard for thread also.Grade,J/K55,L/N80,P110Thread, BTC,LTC,STC. ... 114.3mmWall thickness,4.83-6.88 mmEUE,NUESize of Casing ,4 1/2 "- 20."Outside diameter ,114.3 ...