Seamless casing pipe coupling means buttress thread

Product description Company Profile Henan Dongfanglong Machine Manufacture Co., Ltd   Henan Dongfanglong Machine Manufacture Co., Ltd. was founded in 1999, mainly engaged in oil pipes and pipe fittings, oil special drilling and production tools and oil automation equipments. The company is  named as national integration and standard implementation enterprise, a national science and technology-based small and medium-sized enterprise. With honors of"Henan enterprise technology center", "Henan postdoctoral innovation practice base”, the company hold 35 senior engineers, engineers and technicians, and has successively obtained ISO9001 Quality system certificates,  API 5CT certificate authorized by American Petroleum Institute and BV Quality supplier evaluation certificate issued by company of France. Owing more than 30 independent intellectual property rights, forming an industrial chain integrating design, development, manufacturing, tes…