... 2)11B-0088, Professional manufacturer 3)class T & UHS(SM) 4)Excellent quality& low price Company IntroductionOur company ,funded in 1997 ... , subcoupling, polished rod coupling,slim hole(SH) coupling,class SM coupling. Spraying Metal coupling combines top quality steel with a ... rolled thread that increase fatigue resistance. Our T and SM coupling are manufactured from high quality steel pipe in accord ...