API 5CT couplings for casing and tubing

Hebei Borun Steel Trade Co.,Ltd is a manufacturer and exporter with 15 years' experiences.We mainly exports Carbon Steel(Seamless steel pipe,OCTG and so on).If you're interested,pls contact me. Technical standard API SPEC 5CT,API SPEC 5B Product grade H40,J55,K55,N80-1,N80Q,L80,C95,T95,P110 Specification range OD127~365.12mm(4 1/2"~13 3/8") Thread types Short round thread(STC),Long round thread(LC),Buttress thread(BC) Application of product Internally threaded cylinder for