Couplings are short lengths of pipe used to connect 2joints of tubing or casing. They come with painted colour codes on their external surface to indicate their grades.
Standards and Technical Conditions for Supply: API Spec 5CT and 5B
Size: 1.9 -- 20
Grade: J55, K55, N80-1, C90, C95, T95, P110, Q125
Tread Types: NUE, EUE, VAM, STC, LTC, BTC, special clearance, XC, VAM TOP, NEW VAM.
Packing: by carton, wooden case, wooden pallet or customized
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