API Tubing and Casing Coupling 1.Grade: J55, K55, N80 ... , L80, P110 2.Thread: EUE,NUE,BTC, 3.Standard: API 5CT 4.Origin: China API Tubing and ... Casing Coupling --------------------------------------------------------------------------------------------------------------Specifications API Tubing CouplingSize and SpecificationDescriptions and SizeType of ThreadO ...