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Bulkhead Union 
UBU 

UBU Bulkhead Union

Connects Fractional(Inch) Tube

Part No.

Tube OD
T

Dimensions (mm)

E
Min.

h

H

F

G

I

l1

L

L1

Panel
Hole
Size

Max
Panel
Thickness

inch

mm

inch

mm

inch

mm

UBU-01

1/16

1.68

1.3

5/16

7.93

5/16

7.93

9.0

11.1

23.9

13.5

31.9

17.5

5.2

3.1

UBU-02

1/8

3.17

2.3

1/2

12.70

7/16

11.11

12.8

15.4

38.1

24.6

51.7

31.4

8.3

12.7

UBU-03

3/16

4.76

3.0

9/16

14.28

1/2

12.70

14.0

16.4

40.4

25.4

54.2

32.3

9.9

12.7

UBU-04

1/4

6.35

4.8

5/8

15.87

9/16

14.28

15.1

17.4

42.9

26.2

57.2

33.4

11.5

10.2

UBU-05

5/16

7.93

6.4

11/16

17.46

5/8

15.87

16.6

18.8

46.0

28.4

61.4

36.1

13.1

11.2

UBU-06

3/8

9.52

7.0

3/4

19.05

11/16

17.46

16.7

18.9

47.5

29.5

62.1

36.8

14.7

11.2

UBU-08

1/2

12.70

10.0

15/16

23.81

7/8

22.22

22.7

25.6

50.8

31.8

70.8

41.8

19.4

12.7

UBU-10

5/8

15.87

12.0

1-1/16

26.98

1

25.40

24.5

22.0

52.3

32.5

72.7

42.7

22.6

12.7

UBU-12

3/4

19.05

16.0

1-3/16

30.16

1-1/8

28.57

24.4

21.9

58.7

37.3

78.9

47.4

25.8

16.8

UBU-14

7/8

22.22

18.0

1-3/8

34.92

1-1/4

31.75

26.0

22.0

64.3

42.9

84.6

53.1

29.0

19.1

UBU-16

1

25.40

22.0

1-5/8

41.27

1-1/2

38.10

31.1

26.1

71.4

45.2

95.6

57.3

33.7

19.1

UBU-20

1-1/4

31.75

26.0

1-7/8

47.63

1-7/8

47.63

40.8

38.5

78.9

47.7

122.5

69.5

42.0

20.0

UBU-24

1-1/2

38.10

33.0

2-1/4

57.15

2-1/4

57.15

50.1

45.3

84.8

49.2

139.4

76.5

50.0

20.0

UBU-32

2

50.80

46.0

2-3/4

69.85

3

76.20

69.1

63.5

105.7

56.4

181.9

94.5

67.1

19.1

Connects Metric Tube

Part No.

Tube OD
T

Dimensions (mm)

E
Min.

h

H

F

G

l

l1

L

L1

Panel
Hole
Size

Max
Panel
Thickness

mm

mm

mm

UBU-M03

3

2.3

14.28

11.11

12.7

15.3

38.1

24.6

51.4

31.3

8.3

12.7

UBU-M04

4

2.3

14.28

12.70

13.7

16.1

40.4

25.4

53.4

31.9

9.9

12.7

UBU-M06

6

4.8

15.87

14.28

15.3

17.6

42.9

26.2

57.7

33.6

11.5

10.2

UBU-M08

8

6.4

17.46

15.87

16.3

18.7

46.0

28.4

61.2

35.9

13.1

11.2

UBU-M10

10

8.0

22.22

19.05

17.3

19.5

48.5

29.5

63.9

37.2

16.2

11.2

UBU-M12

12

9.5

23.81

22.22

22.8

21.7

50.8

31.8

71.0

41.9

19.5

12.7

UBU-M14

14

12.0

26.98

23.81

24.8

22.3

52.3

32.5

73.2

42.9

22.8

12.7

UBU-M15

15

12.0

26.98

25.40

24.4

21.9

52.3

32.5

72.5

42.6

22.8

12.7

UBU-M16

16

12.0

26.98

25.40

24.5

22.0

52.3

32.5

72.7

42.7

22.8

12.7

UBU-M18

18

15.0

30.16

30.16

24.5

22.0

58.7

37.3

79.1

47.5

26.0

16.8

UBU-M20

20

16.0

34.92

31.75

26.2

22.1

64.3

42.9

84.8

53.2

29.0

17.0

UBU-M22

22

16.0

34.92

31.75

26.2

22.1

64.3

42.9

84.8

53.2

29.0

19.1

UBU-M25

25

22.0

41.27

38.10

31.1

26.1

71.4

45.2

95.5

57.3

33.7

19.1

UBU-M32

32

27.0

50.80

50.80

40.9

38.6

82.3

49.5

126.1

71.4

42.5

19.0

UBU-M38

38

33.0

60.30

60.30

49.9

45.1

89.4

51.5

144.0

79.0

50.5

19.0

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