• API 5CT steel couplings for buttress thread (BTC) casing pipes

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. BTC means buttress thread casing pipes, and different casing pipes need different couplings to connect.

Specification

Standard API 5CT latest edition
Grade H40, J55, K55,N80-1, N80-Q, R95, L80-1, C90, T95, P110
Outer Diameter 114.3mm – 508 mm (from 4.5’’ to 20’’ )
Thread Type STC, LTC,and BTC
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 buttress thread casing
Code name Specification OD
tolerance		 Minimum length Boring
diameter
Q

In.

 Width bearing surface
B

In.

 Weight
Lb
OD
Inches		 Standard coupling In. Special clearance
In.		 In. Standard coupling  In. Special clearance
In.
4 1/2 4.500 5.250 4.875 8 7/8 4.640  1/4 15.19 7.68
5 5.000 5.800 5.375 9 1/8 5.140 9/32 18.46 8.82
5 1/2 5.500 6.300 5.875 9 1/4 5.640 9/32 20.50 9.85
6 5/8 6.625 7.390 7.000 9 5/8 6.765  1/4 24.49 12.46
7 7.000 7.875 7.375 10 3/8 7.140 5/16 30.82 13.84
7 5/8 7.625 8.500 8.125 10 5/8 7.765 5/16 34.88 20.47
8 5/8 8.625 9.625 9.125 10 5/8 8.765  3/8 45.99 23.80
9 5/8 9.625 10.625 10.125 10 5/8 9.765  3/8 51.05 26.49
10 3/4 10.750 11.750 11.250 10 5/8 10.890  3/8 56.74 29.52
11 3/4 11.750 12.750 — 10 5/8 11.890  3/8 61.80 —
13 3/8 13.375 14.375 — 10 5/8 13.515  3/8 70.03 —
16 16.000 17.000 — 10 5/8 16.154  3/8 88.81 —
18 5/8 18.625 20.000 — 10 5/8 18.779  3/8 138.18 —
20 20.000 21.000 — 10 5/8 20.154  3/8 110.45 —

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