Union (CU)

A weld union (CU) pipe fitting is similar to a coupling, except it is designed to allow quick and convenient disconnection of pipes for maintenance or fixture replacement. While a coupling would require either solvent welding or being able to rotate all the pipes adjacent as with a threaded coupling, a union provides a simple nut transition, allowing easy release at any time.

Materials: stainless steel 304, 316 and 316L

Threaded: BSPT, BSPP, NPT, DIN

Temperature: -50°C-450°C

Finish: natural, nickel plated, electro polished plated or any coating as per customer's needs

Union (CU)

Union (CU)

Union (CU)

Union (CU)

Union (CU)

Union (CU)

Union (CU)

Union (CU)


Nom. 

Pipe 

Size

Pipe 

End 

Min

Socket 

Bore 

Dia.

Socket 

Wall 

Min.

Water 

Way 

Bore

Laying 

Length

Male 

Flange 

Min.

Nut 

Min.

Threads 

Per 

25.4 Max

Bearing 

Min.

Depth of 

Socket Min.

A

B

C

D

E

F

G

H

J

K

1/8

21.8

10.92
10.67

3.17

6.83
6.43

22.4
19.0

3.17

3.17

16

1.24

9.6

¼

21.8

14.22
13.97

3.30

9.85
9.45

22.4
19.0

3.17

3.17

19

1.24

9.6

3/8

25.9

17.78
17.53

3.48

13.92
13.51

26.9
20.6

3.43

3.43

14

1.37

9.6

½

31.2

21.84
21.59

4.06

17.47
17.07

26.9
20.6

3.68

3.68

14

1.50

9.6

¾

37.1

27.18
26.92

4.27

21.79
21.39

31.8
25.4

4.06

4.06

11

1.68

12.7

1

45.5

34.04
33.78

4.95

28.14
27.74

34.3
26.2

4.57

4.44

11

1.85

12.7

11/4

54.9

42.67
42.42

5.28

35.76
35.36

40.6
32.5

5.33

5.21

11

2.13

12.7

11/2

61.5

48.77
48.51

5.54

41.61
41.20

42.2
34.0

5.84

5.59

10

2.31

12.7

2

75.2

61.47
61.21

6.05

52.53
52.12

45.3
37.3

6.60

6.35

10

2.69

15.8

21/2

91.7

74.17
73.66

7.65

64.72
64.31

61.7
52.1

7.49

7.11

8

3.07

15.8


Special Union (CU) specifications can be produced by the customer's requirements!

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