Vigor Drilling Blast Joint (Flow Coupling) is placed as part of tubing string in front of perforations. The OD of the heavy wall pipe is same as the tubing coupling diameter. The Coupling Ends design also can minimize the inner flow turbulence effect when it is screwed on tubing's at its both sides.Blast Joint is made from high quality alloy steel to ensure maximum abrasion resistance and strength. The material grade also could be AISI 4130/4140 to meet API Grades -J55,K55,N80,L80,C90,T95,P110,also available in 9Cr 80,13Cr 80/85,13Cr95,Super 13 Cr95, standard as per API 5CT. And in H2S service, the hardness is available heat treated to between 18 and 22 HRC as per NACE MR-0175.Threads is available in API tubing connections. Most tubing connections can be supplied, however, I.D./O.D. dimensions may vary depending on the tubing connection and tubing weight.If you are looking for competitive, high quality and fast delivery oilfield flow coupling in stock, or if you are planning to buy flow coupling API from one of the leading blast joint coupling manufacturers and suppliers China, please feel free to contact VIGOR.