TIANJIN RICHSEN TECHNOLOGY CO.,LTD own modern factory covering a total area of 1000m2, have two Medium Frequency heat treatment production line, with 30 CNC threading machines. We equipped with perfect NDT equipement, full specification of thread measuring instruments pipes to ensure that our products comply with the API Standard. At the same time, the company also invested a seamless pipe factory, in order to supply pipes for our production. The company has passed ISO 9001 and API - 5 CT certification, Annual capacity is one million pieces of couplings. We can also machine various types of Non- API (Premium connection) product.