| Product: | Casing and Tubing Coupling, Casing Coupling, Tubing Coupling |
| Application: | Used for connect 2 joints of tubing or casing |
| Size: | Tubing Coupling : 1.8/9 - 4-1/2'' |
| Casing Couping : 4-1/2'' - 13-3/8'' | |
| Pipe Standard: | API 5CT and 5B PSL1/PSL2 J55,K55,N80-1,N80-Q, |
| API 5CT and 5B L80-1,C90, C95,T95, P110, Q125 | |
| Surface: | Whole Phosphating or inside phosphating and outside coating |
| Thread: | NUE, EUE, STC, LTC, BTC, XC, HYDRILL CS |
| Special Service | Sweet Service, Sour Service, Anti-H2S, NACE MR0175/ISO15156 |
| Packing: | By carton, wooden case, wooden pallet or requirement of customer |
Specification of Tubing And Casing Coupling
|
Product: |
Casing and Tubing Coupling, Casing Coupling, Tubing Coupling |
|
Application: |
Used for connect 2 joints of tubing or casing |
|
Size: |
Tubing Coupling : 1.8/9 - 4-1/2'' |
|
Casing Couping : 4-1/2'' - 13-3/8'' |
|
|
Pipe Standard: |
API 5CT and 5B PSL1/PSL2 J55,K55,N80-1,N80-Q, |
|
API 5CT and 5B L80-1,C90, C95,T95, P110, Q125 |
|
|
Surface: |
Whole Phosphating or inside phosphating and outside coating |
|
Thread: |
NUE, EUE, STC, LTC, BTC, XC, HYDRILL CS |
|
Special Service |
Sweet Service, Sour Service, Anti-H2S, NACE MR0175/ISO15156 |
|
Packing: |
By carton, wooden case, wooden pallet or requirement of customer |
Properties of Casing Couplings：
♦ The material of casing couplings is H40, J55, K55, M65, N80-1, N80Q, L80, C95, T95 and P110 grade steel with high quality and good performance;
♦ The outer diameter ranges from 127mm to 365.12 mm;
♦ The casing couplings thread patterns include short round thread, long round thread and buttress thread.
Tubing coupling is a kind of drilling tool available in oil field. Tubing couplings are mainly used in connecting oil pipes. This type of pipe coupling has handled the problem that the existing couplings tend to crack because of stress concentration. The oil pipe ends and the inner wall of the tubing coupling are connected by threads. And the oil pipes and the ends of the tubing coupling have the same type of threads. It is not easy to crack for this type of connection and the connection effect is good. The tubing coupling can avoid the oil well string dropout accident effectively.
Properties of Tubing Coupling：
♦ The material of tubing couplings is H40, J55, N80-1, N80Q, L80, C90, T95 and P110 grade steel with high quality and good performance;
♦ It is mainly used to connect two oil pipes;
♦ The tubing coupling thread patterns include non-upset thread and upset thread;
♦ The outer diameter of tubing coupling ranges from 55.88 mm to 141.3 mm;
API Tubing Coupling
| Specification | |
| Size (Pipe OD) (in) | 1.900, 2-3/8, 2-7/8, 3-1/2, 4, 4-1/2 |
| Upset | Non UpsetExternal Upset |
| Grade | J-55, C-75, L-80, N-80, C-95, P-110 |
| Option | Electro-zinc platedPhosphorised |
API Casing Coupling
| Specification | |
| Size (Pipe OD) (in) | 4-1/2, 5, 5-1/2, 6-5/8, 7, 7-5/8, 8-5/8, 9-5/8, 10-3/4, 11-3/4, 13-3/8, 16, 18-5/8, 20 |
| Threading | Short Round-Thread Casing (STC)Long Round-Thread Casing (LC)Buttress Thread Casing (BC) |
| Grade | H-40, J-55, K-55, C-75, L-80, N-80, C-95, AS-95, P-110, L80-13CR |
Applicable Standards:
API 5CT material for body;
API 5B for API threads;
Premium thread per licensor specifications
Coupling manufacturing process includes forging, heat treatment, machining, threading, and quality inspection.
Each coupling undergoes dimensional inspection, thread gauge verification, and visual inspection.
Couplings are packed in wooden boxes or bundles with rust-proof paper, wrapped with waterproof plastic bags.
API 5CT Coupling Dimension
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API Tubing Coupling |
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| Descriptions and size | Type of Thread | O.D*L | Weight | |
| (mm) | (kg) | |||
| Tubing Coupling | 1.05 | NUE | 33.35*80.96 | 0.23 |
| 1.05 | EUE | 42.16*82.55 | 0.38 | |
| 1.315 | NUE | 42.16*82.55 | 0.38 | |
| 1.315 | EUE | 48.26*88.90 | 0.57 | |
| 1.66 | NUE | 52.17*88.90 | 0.59 | |
| 1.66 | EUE | 58.88*95.25 | 0.68 | |
| 1.9 | NUE | 55.88*95.25 | 0.56 | |
| 1.9 | EUE | 63.50*98.42 | 0.84 | |
| 2-3/8″ | NUE | 73.02*107.95 | 1.28 | |
| 2-3/8″ | EUE | 77.80*132.82 | 1.55 | |
| 2-7/8″ | NUE | 88.90*130.18 | 2.34 | |
| 2-7/8″ | EUE | 93.17*133.35 | 2.4 | |
| 3-1/2″ | NUE | 107.95*142.88 | 3.71 | |
| 3-1/2″ | EUE | 114.30*146.05 | 4.1 | |
| 4″ | NUE | 120.65*146.05 | 4.35 | |
| 4″ | EUE | 127.00*152.40 | 4.82 | |
| 4-1/2″ | NUE | 132.08*155.58 | 4.89 | |
| 4-1/2″ | EUE | 141.30*158.75 | 6.05 | |
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API Casing Coupling |
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Descriptions and size |
Type of Thread |
O.D*L |
Weight |
|
|
(mm) |
(kg) |
|||
|
Casing Coupling |
4-1/2″ |
STC |
127.00*158.75 |
5.23 |
|
4-1/2″ |
LTC |
127.00*177.80 |
4.15 |
|
|
4-1/2″ |
BTC |
127.00*225.42 |
4.55 |
|
|
5″ |
STC |
141.30*165.10 |
4.66 |
|
|
5″ |
LTC |
141.30*196.85 |
5.75 |
|
|
5″ |
BTC |
141.30*231.78 |
5.85 |
|
|
5-1/2″ |
STC |
153.67*171.45 |
5.23 |
|
|
5-1/2″ |
LTC |
153.67*203.20 |
6.42 |
|
|
5-1/2″ |
BTC |
153.67*234.95 |
6.36 |
|
|
6-5/8″ |
STC |
187.71*184.15 |
9.12 |
|
|
6-5/8″ |
LTC |
187.71*222.25 |
11.34 |
|
|
6-5/8″ |
BTC |
187.71*244.48 |
11.01 |
|
|
7″ |
STC |
194.46*184.15 |
8.39 |
|
|
7″ |
LTC |
194.46*228.60 |
10.83 |
|
|
7″ |
BTC |
194.46*254.00 |
10.54 |
|
|
7-5/8″ |
STC |
215.90*190.50 |
12.3 |
|
|
7-5/8″ |
LTC |
215.90*234.95 |
15.63 |
|
|
7-5/8″ |
BTC |
215.90*263.52 |
15.82 |
|
|
8-5/8″ |
STC |
244.48*196.85 |
16.23 |
|
|
8-5/8″ |
LTC |
244.48*254.00 |
21.67 |
|
|
8-5/8″ |
BTC |
244.48*269.88 |
20.86 |
|
|
9-5/8″ |
STC |
269.88*196.85 |
18.03 |
|
|
9-5/8″ |
LTC |
269.88*266.70 |
25.45 |
|
|
9-5/8″ |
BTC |
269.88*269.88 |
23.16 |
|
|
10-3/4″ |
STC |
298.45*203.20 |
20.78 |
|
|
10-3/4″ |
BTC |
298.45*269.88 |
25.74 |
|
|
11-3/4′ |
STC |
323.85*203.20 |
22.64 |
|
|
11-3/4′ |
BTC |
323.85*269.88 |
28.03 |
|
|
13-3/8″ |
STC |
365.12*203.20 |
25.66 |
|
|
13-3/8″ |
BTC |
365.12*269.88 |
31.77 |
|
|
16″ |
STC |
431.80*228.6 |
34.91 |
|
|
16″ |
BTC |
431.80*269.88 |
40.28 |
|
|
18-5/8″ |
STC |
508.00*228.60 |
51.01 |
|
|
18-5/8″ |
BTC |
508.00*269.88 |
62.68 |
|
|
20″ |
STC |
533.40*228.6 |
43.42 |
|
|
20″ |
LTC |
533.4*292.10 |
57.04 |
|
|
20″ |
BTC |
533.40*269.88 |
50.1 |
|
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Couplings |
Size in |
Max. OD in(mm) |
Min length in(mm) |
Grade |
||
|
NU |
EU |
NU |
EU |
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|
23/8 |
2.875(73.03) |
3.063(77.80) |
41/4(107.95) |
47/8(123.83) |
J55
N80 |
|
|
|
27/8 |
3.500(88.90) |
3.668(93.20) |
51/8(130.18) |
51/4(133.35) |
|
|
|
31/2 |
4.250(108.00) |
4.500(114.30) |
55/8(142.88) |
53/4(146.05) |
|
|
Crossovers |
J55,N80,L80 All kinds of crossovers, connections and sub-couplings of grades J55, N80 and L80 |
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Three main types:
(1) BTC (Buttress Thread Casing) Coupling - standard for casing, excellent sealing
(2) LTC (Line Thread Casing) Coupling - uses a gasket seal, good for tubing and casing
(3) STC (Short Thread Casing) Coupling - economical option for low-pressure applications
Selection depends on thread type and pressure rating.
API couplings follow API 5CT specifications with standard dimensions and tolerances.
Premium couplings offer:
(1) Enhanced sealing performance
(2) Higher torque capacity
(3) Better resistance to vibration and cyclic loading
(4) Reduced risk of thread damage
Premium is recommended for high-pressure, high-temperature, or critical service wells.
Every coupling undergoes:
(1) 100% dimensional inspection
(2) Thread inspection with API gauge tools
(3) Visual inspection for defects
(4) Hardness testing
(5) Thread make-up test
All couplings are traceable with full MTC (Mill Test Certificate) per EN 10204 3.1. We also provide thread compound compliant with API specifications.
Pup joints are short lengths of tubing or casing (typically 2-10 ft) with couplings on both ends.
Used to:
(1) Adjust total string length without cutting pipe
(2) Provide access points for downhole tools
(3) Create space for fishing operations
(4) Install circulation subs
Available in various lengths and grades to meet your specific requirements.
Every shipment includes:
(1) EN 10204 3.1 mill test certificate
(2) Chemical composition report
(3) Mechanical properties (tensile, hardness)
(4) Dimensional report
(5) Thread inspection report
Third-party inspection (SGS, BV, API) available upon request.
Yes, we manufacture custom couplings:
(1) Non-standard sizes
(2) Special grades for corrosive service
(3) Premium connections
(4) Various thread configurations
We also offer crossover subs to connect different thread types. Contact us with your specifications.