API 5CT steel couplings, also known as OCTG steel couplings, used to connect petroleum casing and tubing, is usually manufactured in seamless type, and its material grade is same with the pipe body of casing and tubing (API 5CT K55/J55, N80, L80, P110 etc), same PSL or providing higher grades than requested.  Tubing pipes contains two types :EUE and NU tubing pipes, and each type has its suitable couplings.

    Specification

    Standard API 5CT latest edition
    Grade H40, J55, N80-1, N80-Q, R95, L80-1, C90, T95, P110
    Outer Diameter 26.67mm – 114.3 mm (from 1.050” to 4.5’’ )
    Type EUE, NU
    Packing Thread protector,black paint and bundling
    Section Shape Round
    Place of Origin China
    Technique Seamless hot rolled
    Application Connecting casing pipes and tubing pipes
    Place of Origin China
    MOQ 1 ton
    Transportation 1.Sea port:Tianjin Xingang port,Qingdao port,Shanghai Luojing port
    →America,Europe,Africa,Middle East,India, Pakistan,Japan,Korea,
    Australia…(shipping)

    2.Land port:Alataw pass port(Пограничный пункт “Алашанькоу”)
    Khorgos port(Пограничный пункт “Хоргос”)
    →East Asia, Uzbekistan,Kazakhstan,Kyrgyzstan…(Train)
    Erlianhot port→Mongolia(Train and Truck)
    Manchuria port→Russia(Train and Truck)
    Dimension, tolerance and weight of Coupling for EUE tubing
    Code name Specification OD
    tolerance    		 Minimum length

    In.

    		 Boring
    diameter
    Q

    In.

    		 Bearing surface width of Standard coupling

    b
    In.

    		 Diameter of Maximum bearing surface Weight
    Lb
    OD
    Inches    		 Standard coupling In. Special clearance
    In.    		 Standard coupling with Special chamfer
    In.    		 Special clearance
    In.    		 Standard coupling In. Special clearance
    In.
    1.050 1.050 1.660 — 3 1/4 1.378 3/32 1.488 — 0.84 —
    1.315 1.315 1.900 — 3 1/2 1.531 3/32 1.684 — 1.26 —
    1.660 1.660 2.200 — 3 3/4 1.875 1/8 2.006 — 1.49 —
    1.900 1.900 2.500 — 3 7/8 2.156 1/8 2.297 — 1.85 —
    2-3/8 2.375 3.063 2.910 4 7/8 2.656 5/32 2.828 2.752 3.43 2.35
    2-7/8 2.875 3.668 3.460 5 1/4 3.156 7/32 3.381 3.277 5.30 3.42
    3-1/2 3.500 4.500 4.180 5 3/4 3.813 1/4 4.125 4 9.03 5.24
    4 4.000 5.000 — 6 4.313 1/4 4.625 — 10.63 —
    4-1/2 4.500 5.563 — 6 1/4 4.813 1/4 5.156 — 13.33 —

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