CHINA COUPLING BLANK MANUFACTURER 20″K55 BC

The product specifications of our company are from 2-3/8 to "20", and the steel grade is from J55 to Q125, covering all full series and steel grades. The raw materials used by our company are all purchased from large and well-known domestic steel mills. We will have every strict inspection on each product in the process of production, and each piece of casing coupling or tubing coupling keeps its related processing records, thread inspection records, flaw detection inspection records, phosphating and packaging records, to realize the traceability in the whole process, so as to ensure that every product can meet the customer requirements.