Stainless Steel Low Pressure BSP Fittings

BSP fittings are a family of fittings used to connect up threaded pipe and equipment. They are manufactured from pipe, bar, hollow bar, castings or forgings.

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  • The pipe to be threaded must have a wall thickness of Schedule 40S minimum.
  • The fittings are used in non-critical, low pressure applications where welding is not possible or required. They therefore provide a relatively low cost method of connection.
  • BSP fittings are made only in type 316.
  • BSP fittings are usually fitted with a sealant (paste or tape such as PTFE) and are considered to be permanent pipe-work.
  • Low Pressure BSP Fittings are rated at 150lb and are made to wrought iron specification BS1740. BSP fittings are made only in type 316.
  • They are provided with a Certificate of Conformity only, and not a full Test Certificate.
  • Sizes ½ to 3 inch are the most commonly used and thus the most readily available.
  • External MALE threads are tapered and Internal FEMALE threads are parallel. The threads are cut to BS21: Part 1: 1985 and are called Whitworth Threads.
Low pressure 90 elbow
Low pressure equal tee
Low pressure union
Low pressure 45 elbow
Low pressure half socket
Low pressure socket
Low pressure round nut
Low pressure reducing socket
Low pressure hexagon nipple
Low pressure reducing nipple
Low pressure equal nipple
Low pressure cap
Low pressure barrel nipple
Low pressure welding nipple
Low pressure square head plug
Low pressure hexagon head plug
Low pressure hose connector
Low pressure reducing bush
Low pressure hexagon nut
Low pressure cross
  • 90o Elbow: Enables the pipe run to be turned through a right angle. Female thread both ends.
  • 45o Elbow: Enables the pipe run to be turned through 45 degrees. Female thread both ends.
  • Equal Tee: This allows the connection of a branch at right angles from the main pipe run. Female thread at all three connections.
  • Socket: Used to connect two pipes or fittings that have male threads. Female thread both ends.
  • Half Socket: Used to connect two pipes or fittings that have male threads. Used when there is a confined space. Female thread both ends.
  • Reducing Socket: Used to connect two different sizes of pipe or fittings that have male threads. Female threads both ends.
  • Cap: Used to terminate a male threaded pipe run. Female threaded.
  • Union: Connects male threaded pipe or components. Used when easy or regular access is required e.g. for cleaning. Female thread both ends.
  • Hexagon Nut: Used to fix male threaded fittings. Female threaded.
  • Reducing Bush: Connects a larger female threaded component to a smaller male threaded component. Male thread at the large end and Female thread at the small end.
  • Hexagon Nipple: Used to connect two female threaded components. Male thread both ends.
  • Hexagon Reducing Nipple: Connects two female threaded components of different sizes. Male thread both ends.
  • Barrel Nipple: Used to connect two female threaded components of the same size. Male (taper) thread both ends.
  • Parallel or Equal Nipple: The only BSP fitting to have a male parallel thread. Used to connect female threaded components together.
  • Spigot or Welding Nipple: Weld prepared at one end and a male thread at the other. Used to weld onto equipment that is to be connected to a female threaded component.
  • Close Taper Nipple: Used to connect two female threaded components. No land between the threads so shorter than a barrel nipple and thus used where space is restricted. Male thread both ends.
  • Hexagon Head Plug: Used to blank off female threaded outlet. Cannot be used to blank off a pipe directly as pipes only have male threads. Male threaded.
  • Square Head Plug: Used to blank off female threaded outlet. Cannot be used to blank off a pipe directly as pipes only have male threads. Male threaded.
  • 90o Bend: This has a larger radius than a 90-degree elbow and is again used to turn the pipe run through a right angle. Female thread both ends.
  • Hose Nipple: Used to connect a hose to the system. Male thread one end and hose serrations at the other.

Whitworth Threads/British Standard Pipe Thread

Nominal Size of Outlet
(in)
Nominal Size of Outlet
(mm)
Min O/D
(mm)
Min O/D of Body
Behind External Thread (mm)
Min I/D of Body
Behind Internal Thread mm
No of Threads
per Inch

1/8

6

15.0

9.8

8.6

28

1/4

8

18.5

13.3

11.4

19

3/8

10

22.0

16.8

15.0

19

1/2

15

27.0

21.1

18.6

14

3/4

20

32.5

26.6

24.1

14

1

25

39.5

33.4

30.3

11

1 1/4

32

49.0

42.1

39.0

11

1 1/2

40

56.0

48.0

44.8

11

2

50

68.0

59.8

56.7

11

2 1/2

65

84.0

75.4

72.2

11

3

80

98.0

88.1

84.9

11

4

100

124.0

113.3

110.1

11

5

125

151.0

138.7

135.5

11

6

150

178.0

164.1

160.9

11

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