Threaded Pipe Fittings

DIMENSIONS OF SOCKET - WELD
AND
THREADED UNION (BS3799) (in mm)

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.

Length Assem. Nominal

Clear Assem. Nut

A

B

C

D

E

F

G

H

J

K

L

N

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

41.1

49.0

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

41.4

49.0

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

46.0

55.0

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

49.0

57.0

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

56.9

67.0

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

62.0

79.0

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

71.1

94.0

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

75.5

111.0

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

86.1

132.0

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

102.4

148.0

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

109.0

175.0

DIMENSIONS OF STEEL PLUG & BUSHINGS (BS 3799) (In mm)

Nominal
Pipe
Size

Length
(Minimim)
A

Plugs Square Head

Plugs Round Head

Hex Plugs & Bushings

Height of
Square
(Minimum)
B

Width
Flats
(Minimum)
C

Nominal
Diameter
of Head
E

Length
(Minimum)
D

Width Flats
(Nominal)
F

Hex Height (Min.)

Bushing
G

Plug
H

1/8''

9.7

6.6

7.1

10.4

35.1

11.2

-

6.4

1/4''

11.2

6.6

9.7

13.5

41.1

15.7

3.0

6.4

3/8''

12.7

7.9

11.2

17.5

41.1

17.5

4.1

7.9

1/2''

14.2

9.7

14.2

21.3

44.5

22.4

4.8

7.9

3/4''

15.7

11.2

15.7

26.9

44.5

26.9

5.6

9.7

1''

19.1

12.7

20.6

33.3

50.8

35.1

6.4

9.7

1-1/4''

20.6

14.2

23.9

42.9

50.8

44.5

7.1

14.2

1-1/2''

20.6

15.7

28.4

48.5

50.8

50.8

7.9

15.7

2''

22.4

17.5

33.3

60.5

63.5

63.5

8.6

17.5

2-2/2''

26.9

19.1

38.1

73.2

69.9

76.2

9.7

19.1

3''

28.4

20.6

42.9

88.9

69.9

88.9

10.4

20.6

4''

31.8

25.4

53.5

114.3

76.2

117.3

12.7

25.4