• API 5CT steel couplings for NU tubing pipes used in oilfield

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 NU tubing
Code name Specification OD
tolerance		 Minimum length Boring
diameter
Q		 Width of bearing surface
B		 Diameter of Maximum bearing surface
Special chamfer		 Weight
OD
In.		 In. In In. In. In. Lb
1.050 1.050 1.313 3 1/5 1.113 1/16 1.181 13.15
1.315 1.315 1.660 3 1/4 1.378 3/32 1.488 17.32
1.660 1.660 2.054 3 1/2 1.723 1/8 1.857 19.66
1.900 1.900 2.200 3 3/4 1.963 1/16 2.050 25.00
2-3/8 2.375 2.875 4 1/4 2.438 3 3/16 2.625 30.69
2-7/8 2.875 3.500 5 1/8 2.938 3 3/16 3.188 34.15
3-1/2 3.500 4.250 5 5/8 3.563 3 3/16 3.875 47.42
4 4.000 4.750 5 3/4 4.063 3 3/16 4.375 55.72
4-1/2 4.500 5.200 6 1/8 4.563 3 3/16 4.850 —

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