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Bulkhead Union - BU
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Tube O.D inch
Part No.
A
C1
C2
D
L
W inch
B'head hole drill size 

Max b'head thick ness 
Min bore 
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
1/16
BAX - 1BU1
1.23
31.24
0.43
10.92
0.68
17.27
0.94
23.88
0.53
13.46
5/16
13/64
5.2
1/8
3.1
0.05
1.27
1/8
BAX - 2BU2
2.02
51.31
0.60
15.24
1.23
31.24
1.50
38.10
0.97
24.64
1/2
21/64
8.3
1/2
12.7
0.09
2.29
3/16
BAX - 3BU3
2.11
53.59
0.64
16.26
1.26
32.00
1.59
40.39
1.00
25.40
9/16
25/64
9.9
1/2
12.7
0.13
3.30
1/4
BAX - 4BU4
2.27
57.66
0.70
17.78
1.31
33.27
1.69
42.93
1.02
25.91
5/8
29/64
11.5
17/32
10.2
0.19
4.83
5/16
BAX - 5BU5
2.40
60.96
0.73
18.54
1.42
36.07
1.81
45.97
1.12
28.45
11/16
33/64
13.1
9/16
11.2
0.25
6.35
3/8
BAX - 6BU6
2.46
62.48
0.76
19.30
1.44
36.58
1.88
47.75
1.15
29.21
3/4
37/64
14.7
9/16
11.2
0.28
7.11
1/2
BAX - 8BU8
2.80
71.12
0.87
22.10
1.65
41.91
2.00
50.80
1.25
31.75
15/16
49/64
19.4
19/32
12.7
0.41
10.41
5/8
BAX - 10BU10
2.86
72.64
0.87
22.10
1.68
42.67
2.06
52.32
1.28
32.51
1.1/16
57/64
22.6
19/32
12.7
0.50
12.70
3/4
BAX - 12BU12
3.11
78.99
0.87
22.10
1.87
47.50
2.31
58.67
1.47
37.34
1.3/16
1.1/64
25.8
25/32
16.8
0.63
16.00
7/8
BAX - 14BU14
3.33
84.58
0.87
22.10
2.09
53.09
2.53
64.26
1.69
42.93
1.3/8
1.9/64
29.0
15/16
19.1
0.75
19.05
1
BAX - 16BU16
3.78
96.01
1.05
26.67
2.27
57.66
2.81
71.37
1.78
45.21
1.5/8
1.21/64
33.7
15/16
19.1
0.88
22.35

Metric Tubing
(Metric tube fittings are identified by a stepped shoulder on both the body and the threaded end of the nut as illustrated.)

Tube O.D  mm
Part Number
A
C1
C2
D
L
W inch
B'head hole drill size mm
Max b'head thichness mm 
Min bore
mm
mm
mm
mm
mm
mm
3
BAX - 3MBU
51.3
15.3
31.2
38.2
24.6
14.0
8.3
12.7
2.4
4
BAX - 4MBU
53.7
16.1
32.0
40.5
25.4
14.0
9.9
12.7
3.0
6
BAX - 6MBU
57.9
17.7
33.7
42.9
26.2
16.0
11.5
10.2
4.8
8
BAX - 8MBU
61.0
18.6
36.0
46.0
28.5
18.0
13.1
11.2
6.4
10
BAX - 10MBU
63.6
19.5
37.0
48.4
29.4
22.0
16.3
11.2
7.9
12
BAX - 12MBU
71.0
22.0
41.9
50.8
31.8
24.0
19.5
12.7
9.5
16
BAX - 16MBU
72.6
22.0
42.6
52.4
32.5
27.0
22.5
12.7
12.7
18
BAX - 18MBU
78.9
22.0
47.4
58.7
37.3
30.0
26.0
16.8
15.1

Note : Dimensions are for referance only and are subject to change without prior intimation.
 
 
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