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Coupling – Eikon Techniques Pvt. Ltd.
 
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Coupling

 

Pipe Coupling Dimensions – Socket Weld & Threaded Couplings

In this article, I have listed pipe coupling dimensions for both socket weld and threaded coupling. These couplings are used in piping for taking small-size branch connections. Mainly to attached instruments.

Socket Weld Coupling Dimensions

Threaded Coupling Dimensions

 

 

NOMINAL PIPE SIZE

OUTER DIAMETER

SOCKET BORE DIAMETER

BORE DIAMETER OF FITTINGS

BORE DIAMETER OF FITTINGS

BORE DIAMETER OF FITTINGS

WALL THICKNESS
# 3000

WALL THICKNESS
# 3000

WALL THICKNESS
# 6000

WALL THICKNESS
# 6000

WALL THICKNESS
# 9000

WALL THICKNESS
# 9000

FULL COUPLING

FULL COUPLING

HALF COUPLING

HALF COUPLING

Inch.

A

B

C – 3000

C – 6000

C – 9000

D

D

D

D

D

D

L1

L2

L1

L2

  

Maximum
Minimum

Maximum
Minimum

Maximum
Minimum

Maximum
Minimum

Average

Minimum

Average

Minimum

Average

Minimum

    

1/8

B+D

11.2
10.8

7.6
6.1

4.8
3.2

 

3.18

3.18

3.96

3.43

  

9.5

6.5

9.5

16.0

1/4

B+D

14.6
14.2

10.0
8.5

7.1
5.6

 

3.78

3.30

4.6

4.01

  

9.5

6.5

9.5

16.0

3/8

B+D

18.0
17.6

13.3
11.8

9.9
8.4

 

4.01

3.50

5.03

4.37

  

9.5

6.5

9.5

17.5

1/2

B+D

22.2
21.8

16.6
15.0

12.5
11.0

7.2
5.6

4.67

4.09

5.97

5.18

9.35

8.18

9.5

9.5

9.5

22.5

3/4

B+D

27.6
27.2

21.7
20.2

16.3
14.8

11.8
10.3

4.90

4.27

6.96

6.04

9.78

8.56

12.5

9.5

12.5

24.0

1

B+D

34.3
33.9

27.4
25.9

21.5
19.9

16.0
14.4

5.69

4.98

7.92

6.93

11.38

9.96

12.5

12.5

12.5

28.5

1 1/4

B+D

43.1
42.7

35.8
34.3

30.2
28.7

23.5
22.0

6.07

5.28

7.92

6.93

12.14

10.62

12.5

12.5

12.5

30.0

1 1/2

B+D

49.2
48.8

41.6
40.1

34.7
33.2

28.7
27.2

6.35

5.54

8.92

7.8

12.7

11.12

12.5

12.5

12.5

32.0

2

B+D

61.7
61.2

53.3
51.7

43.6
42.1

38.9
37.4

6.93

6.04

10.92

9.5

13.84

12.12

16.0

19.0

16.0

41.0

2 1/2

B+D

74.4
73.9

64.2
61.2

  

8.76

7.67

    

16.0

19.0

16.0

43.0

3

B+D

90.3
89.8

79.4
76.4

  

9.52

8.30

    

16.0

19.0

16.0

44.5

4

B+D

103.8
100.7

103.8
100.7

  

10.69

9.35

    

16.0

19.0

16.0

48.0

 

All Dimensions are in mm

        

NOMINAL PIPE SIZE

END TO END

MINIMUM LENGTH OF THREAD

OUTSIDE DIAMETER

Inch.

Full Coupling

Half Coupling

 

 

# 3000

# 6000

 

A

A/2

B

C

D

D

1/8

32

A/2

6.7

6.4

16

22

1/4

35

A/2

10.2

8.1

19

25

3/8

38

A/2

10.4

9.1

22

32

1/2

48

A/2

13.6

10.9

28

38

3/4

51

A/2

13.9

12.7

35

44

1

60

A/2

17.3

14.7

44

57

1 1/4

67

A/2

18

17

57

64

1 1/2

79

A/2

18.4

17.8

64

76

2

86

A/2

19.2

19

76

92

2 1/2

92

A/2

28.9

23.6

92

108

3

108

A/2

30.5

25.9

108

127

4

121

A/2

33

27.7

140

159

 

All Dimensions are in mm

Pipe Fittings Dimensions Tolerance as per ASME B16.9

NOMINAL PIPE SIZE

ALL FITTINGS

ALL FITTINGS

ALL FITTINGS

ELBOWS AND TEES

180 DEG RETURN BENDS

180 DEG RETURN BENDS

180 DEG RETURN BENDS

REDUCERS

CAPS

NPS

O.D. at Bevel (1), (2)

I.D. at End
(1), (3), (4)

Wall Thickness (3)

Centre-to-End Dimension A,B,C,M

Centre-to-Centre O

Back-to-Face K

Alignment of Ends U

Overall Length H

Overall Length E

½ to 2½

0.06
-0.03

0.03

Not less than 87.5% of nominal thickness

0.06

0.25

0.25

0.03

0.06

0.12

3 to 3 ½

0.06

0.06

0.06

0.25

0.25

0.03

0.06

0.12

4

0.06

0.06

0.06

0.25

0.25

0.03

0.06

0.12

5 to 8

0.09
-0.06

0.06

0.06

0.25

0.25

0.03

0.06

0.25

10 to 18

0.16
-0.12

0.12

0.09

0.38

0.25

0.06

0.09

0.25

20 to 24

0.25
-0.19

0.19

0.09

0.38

0.25

0.06

0.09

0.25

26 to 30

0.25
-0.19

0.19

0.12

…

…

…

0.19

0.38

32 to 48

0.25
-0.19

0.19

0.19

…

…

…

0.19

0.38

NOMINAL PIPE SIZE NPS

ANGULARITY TOLERANCES

ANGULARITY TOLERANCES

ALL DIMENSIONS ARE GIVEN IN INCHES. TOLERANCES ARE EQUAL PLUS AND MINUS EXCEPT AS NOTED.

 

Off Angle Q

Off Plane P

(1) Out-of-round is the sum of absolute values of plus and minus tolerance.
(2) This tolerance may not apply in localized areas of formed fittings where increased wall thickness is required to meet design requirements of ASME B16.9.
(3) The inside diameter and the nominal wall thicknesses at ends are to be specified by the purchaser.
(4) Unless otherwise specified by the purchaser, these tolerances apply to the nominal inside diameter, which equals the difference between the nominal outside diameter and twice the nominal wall thickness.

½ to 4

0.03

0.06

5 to 8

0.06

0.12

10 to 12

0.09

0.19

14 to 16

0.09

0.25

18 to 24

0.12

0.38

26 to 30

0.19

0.38

32 to 42

0.19

0.50

44 to 48

0.18

0.75