• API 5CT OCTG steel couplings for round STCLTC casing

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. Round thread casing includes short thread casing (STC)and long thread casing(LTC).

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 round thread casing
Code name Specification OD
tolerance

In.

 Minimum length in. Boring
diameter
Q

In.

 Width bearing surface
B

In.

 Weight
Lb
OD
Inches		 Short Long Short Long
4 1/2 4.500 5.250 6 1/4 7 4 19/32 9/32 11.55 13.15
5 5.000 5.800 6 1/2 7 3/4 5  3/32 9/32 14.17 17.32
5 1/2 5.500 6.300 6 3/4 8 5 19/32  1/4 16.18 19.66
6 5/8 6.625 7.390 7 1/4 8 3/4 6 23/32  1/4 20.11 25.00
7 7.000 7.875 7 1/4 9 7  3/32 5/16 23.98 30.69
7 5/8 7.625 8.500 7 1/2 9 1/4 7 25/32 7/32 26.80 34.15
8 5/8 8.625 9.625 7 3/4 10 8 25/32  1/4 34.44 47.42
9 5/8 9.625 10.625 7 3/4 10 1/2 9 25/32  1/4 39.36 55.72
10 3/4 10.750 11.750 8 — 10 25/32  1/4 45.38 —
11 3/4 11.750 12.750 8 — 11 29/32  1/4 49.44 —
13 3/8 13.375 14.375 8 — 13 17/32 7/32 56.04 —
16 16.000 17.000 9 — 16  7/32 7/32 75.69 —
18 5/8 18.625 20.000 9 — 18 27/32 7/32 117.58 —
20 20.000 21.000 9 11 1/2 20  7/32 7/32 94.38 125.61

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