Henan Dongfanglong Machine Manufacture Co.,Ltd was founded on 1999, with the location of the Intersection of 106 National High way and Jintian Road, East Industries Areas of Puyang, Henan, China. We have more than 15 years of experience of producing, developing and selling tubing coupling,casing coupling,pup joints,tool joints,and so on. We have the ISO 9001 Quality Control Certificate, API - 5CT Certificate with the NO. 5CT-0837 and API - 7 certificate with the NO. 7-0649. With the biggest API couplings workshop,we are one of the biggest manufacturers of API couplings.We are the regular suppliers of Petro China and Sinopec. From 2009, our market has expanded abroad out of China. Our products have already been used in USA, Brazil, Venezuela, India, Kazakhstan, Indonesia and so on. We adhere to the business theory of that:quality first,service first,integrity management,share the wealth,and convince that once cooperation makes forever friends .We sincerely hope to establish business relations with you .