Casing Coupling

Definition - What does Casing Coupling mean?

Casing Coupling is the joining of two short length pipes by the means of male and female threads. All types of casing couplings have internal threads which are known as female thread forms. These thread forms are usually machined so that they can be coupled with the external threads on pipes known as male thread forms.

Petropedia explains Casing Coupling

Casing Couplings are strictly designed as per API specifications. There are three types of casing couplings widely used in the pipeline coupling manufacturing industries namely:

  • Short Thread Casing Coupling
  • Long Thread Casing Coupling
  • Buttress Thread Casing Coupling

The table below shows the specifications with respect to these three casing couplings.

Short Thread Casing Couplings

Casing Size- Outside Diameter (inches)

Coupling Size - Outside Diameter (inches)

Length (inches)

Weight/Coupling (lbs)

Quantity of Palletized Carton

Weight of Palletized Carton

API Casing Coupling Short Thread

4 1/2

5.000

6.250

8.05

343

2716

5

5.563

6.500

10.18

210

2168

5 1/2

6.050

6.750

11.44

216

2501

6 5/8

7.390

7.250

19.97

115

2322

7

7.875

7.250

18.34

120

2231

7 5/8

8.500

7.500

26.93

80

2322

8 5/8

9.625

7.750

35.58

60

2132

9 5/8

10.625

7.750

39.51

50

2006







Long Thread Casing Couplings

Casing Size- Outside Diameter (inches)

Coupling Size- Outside Diameter (inches)

Length (inches)

Weight/Coupling (lbs)

Quantity of Palletized Carton

Weight of Palletized Carton

API Casing Coupling Long Thread

4 1/2

5.000

7.000

9.07

294

2697

5

5.563

7.750

12.56

210

2573

5 1/2

6.050

8.000

14.03

180

2555

6 5/8

7.390

8.750

24.82

100

2315

7

7.875

9.000

23.67

100

2351

7 5/8

8.500

9.250

34.23

80

2807

8 5/8

9.625

10.000

47.48

48

2337

9 5/8

10.625

10.500

55.77

40

2302


Buttress Thread Casing Couplings

Casing Size- Outside Diameter (inches)

Coupling Size - Outside Diameter (inches)

Length (inches)

Weight/Coupling (lbs)

Quantity of Palletized Carton

Weight of Palletized Carton

API Buttress Thread Coupling

4 1/2

5.000

8.875

10.11

196

2007

5

5.563

9.125

12.99

144

2840

5 1/2

6.050

9.250

14.14

144

2061

6 5/8

7.390

9.625

24.46

92

2295

7

7.875

10.000

23.22

80

2068

7 5/8

8.500

10.375

64.84

64

2221

8 5/8

9.625

10.625

45.94

48

2414

9 5/8

10.625

10.625

50.99

40

2256







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