Dimensions of Tubing API Coupling (NU)Size Range: 2-3/8", 2-7/8" and 3-1/2" OD for Tubing4-1/2" -20" OD for CasingThread type: 8RD, 10RD for Tubing(also called EU and NU)BTC, LTC, STC for CasingAlso supply the customization threads as per client’s drawings.Features:1. Coupling is produced through tube rolling, heat treatment, threading and other procedures.2. Surface treatment: Phosphating3. Accordance with API 5CT and 5B standards.4. Inspection includes Non-destructive testing, Hydrostatic pressure(Max.120 MPa).If you are looking for competitive, high quality and fast delivery oilfield coupling in stock, or if you are planning to buy coupling API from one of the leading casing and tubing couplings, phosphating coupling, eue(8rd) and nue(10rd) coupling, premium connection coupling, casing and tubing collar gas tight connection manufacturers and suppliers China, please feel free to contact VIGOR.