OCTG Coupling Dimensions

API Coupling Standard Sizes And Lengths

LTC

Coupling Size

Coupling Size(Decimal)

Standard Coupling Length

4 1/2

5

7

5

5.563

7.75

5 1/2

6.05

8

6 5/8

7.39

8.75

7

7.656

9

7 5/8

8.5

9.25

8 5/8

9.625

10

9 5/8

10.625

10.5

STC

Coupling Size

Coupling Size(Decimal)

Standard Coupling Length

4 1/2

5

6.25

5

5.563

6.5

5 1/2

6.05

6.75

6 5/8

7.39

7.25

7

7.656

7.25

7 5/8

8.5

7.5

8 5/8

9.625

7.75

9 5/8

10.625

7.75

10 3/4

11.75

8

11 3/4

12.75

8

13 3/8

14.375

8

16

17

9

20

21

9

NEU

Coupling Size

Coupling Size(Decimal)

Standard Coupling Length

2 3/8

2.875

4.5

2 7/8

3.5

5.5

3½

4.25

5.625

4½

5.2

6.5

EUE

Coupling Size

Coupling Size(Decimal)

Standard Coupling Length

2 3/8

3.063

4.875

2 7/8

3.668

5.5

3 1/2

4.5

5.75

4 1/2

5.563

6.5

Modified
BTC

Coupling Size

Coupling Size(Decimal)

Standard Coupling Length

2 3/8

2.875

8.5

2 7/8

3.5

8.5

3 1/2

4.25

8.5

4 1/2

5.2

9.5

BTC

Coupling Size

Coupling Size(Decimal)

Standard Coupling Length

4 1/2

5

8.875

5

5.563

9.125

5 1/2

6.05

9.25

6 5/8

7.390

9.625

7

7.656

10

7 5/8

8.5

10.375

8 5/8

9.625

10.625

9 5/8

10.625

10.625

10 3/4

11.75

10.625

11 3/4

12.75

10.625

13 3/8

14.375

10.625