API Couplings of Tubing and Casing

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API Couplings of Tubing andCasing

Fastube API coupling is a product usedto connect two pieces of threaded tubing or casing. By application, it can bedivided into two types, that is, API tubing coupling and API casing coupling.Manufactured by seamless process, the pipe coupling is widely usedin underground engineering applications which requirerunning and pulling casing or tubing.

API pipe coupling is usedfor connection of downhole casing or tubing, so its axiality and thread quality of coupling may greatly affectthe service life of downhole casing and tubing. As anexperienced coupling manufacturer, we at Fastube consistently work to improve coupling processing technique and selectstandard datum planeduring coupling processing, which helps us solve the axiality problem. In addition, we also make great effortsto improve phosphorizing process, which enables us toachieve phosphorized filmthat is uniform, dense and rust resistant. This helps significantly improve thethread surface quality and reduce the possibility of thread gluing,contributing to longer service life of tubing, casingand coupling.

API Coupling of Casing
Steel grade: J55, K55, N801, N80Q, L80-1, L80 9Cr, L8013Cr, C90, T95, P110, Q125 etc.
Size: 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″ etc.
Thread type: LC, STC, BC, etc.
Commonly used casing coupling includes 5-1/2, 7, 9-5/8, and 13-3/8 types.

API Couplings of Tubing
1. Non-upsettubing coupling
Size: 1.050″, 1.315″, 1.660″, 1.900″, 2-3/8″, 2-7/8″, 3-1/2″, 4″, 4-1/2″ etc.
Threads per inch: 8, 10
Commonly used tubing coupling includes 2-3/8″, 2-7/8″, 3-1/2″, 4″, 4-1/2″types.
2. External upset tubing coupling
Size: 1.050″, 1.315″, 1.660″, 1.900″, 2-3/8″, 2-7/8″, 3-1/2″, 4″, 4-1/2 etc.
Threads per inch: 8, 10
Commonly used tubing coupling includes 2-3/8″, 2-7/8″, 3-1/2″, 4″, 4-1/2″types.

Technical Specifications of APICouplings of Tubing and Casing

API tubing coupling
External upset						Non-upset
Label	Outside diameter mm	Weight kg				Label	Outside diameter mm	Weight kg
Label	Outside diameter mm	Regular coupling	Special clearance coupling		Special bevel coupling	Label	Outside diameter mm	Regular coupling	Special bevel coupling
1.050	26.67	0.38	－		0.38	1.050	26.67	0.23	0.23
1.315	33.40	0.57	－		0.57	1.315	33.40	0.38	0.38
1.660	42.16	0.68	－		0.68	1.660	42.16	0.59	0.59
1.900	48.26	0.84	－		0.84	1.900	48.26	0.56	0.56
2-3/8	60.32	1.55	1.07		1.55	2-3/8	60.32	1.28	1.28
2-7/8	73.02	2.40	1.55		2.40	2-7/8	73.02	2.34	2.34
3-1/2	88.90	4.10	2.38		4.10	3-1/2	88.90	3.71	3.71
4	101.60	4.82	－		4.82	4	101.60	4.35	4.35
4-1/2	114.30	6.05	－		6.05	4-1/2	114.30	4.89	4.89

API casing coupling
Round thread						Buttress thread
Label	Outside diameter mm	Weight kg				Label	Outside diameter mm	Weight kg
Label	Outside diameter mm	Short thread		Long thread		Label	Outside diameter mm	Regular coupling	Special clearance coupling
4-1/2	114.30	3.62		4.15		4-1/2	114.30	4.55	3.48
5	127.00	4.66		5.75		5	127.00	5.85	4.00
5-1/2	139.70	5.23		6.42		5-1/2	139.70	6.36	4.47
6-5/8	168.28	9.12		11.34		6-5/8	168.28	11.01	5.65
7	177.80	8.39		10.83		7	177.80	10.54	6.28
7-5/8	193.70	12.30		15.63		7-5/8	193.70	15.82	9.29
8-5/8	219.08	16.23		21.67		8-5/8	219.08	20.86	10.80
9-5/8	244.48	18.03		25.45		9-5/8	244.48	23.16	12.02
10-3/4	273.05	20.78		－		10-3/4	273.05	25.74	13.39
11-3/4	298.45	22.64		－		11-3/4	298.45	28.03	－
13-3/8	339.72	25.66		－		13-3/8	339.72	31.77	－
16	406.40	34.91		－		16	406.40	40.28	－
18-5/8	473.08	54.01		－		18-5/8	473.08	62.68	－
20	508.00	43.42		57.04		20	508.00	50.10

Material

25Mn2,30Mn2,37Mn5,34Mn6,25Mn2V,33Mn2V,(25～30)CrMo etc.

Fastube is a China API couplings of casingmanufacturer and supplier. We offer API couplings of tubing, and special pipes,welded steel tube for pressure purposes, Our highquality products are offered at competitive prices. Fastube is located in China, and the full chain of manufacturingcarbon steel tube for general structural, precision hot rolled pipe, can becompleted in China,even in one city. Lower manufacturing cost saves your purchasing cost. The moredetails of each product are shown on the page with description.

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