DIMENSIONS OF THREADED UNION (BS3799) (in mm)
Nom Pipe Size (NPS) 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 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
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
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
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
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
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
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
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
3 109.2 90.17
89.66
8.31 77.67
77.27
63.8
53.6
8.25 8.00 8 3.53 15.8
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