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How to identify aquarium BSP threads..

BSP threads (British Standard Pipe) are the most popular of all threads. These threads come in two versions, parallel (BSPP) , and tapered (BSPT). The most common thread used on aquarium, pond plumbing and associated equipment is BSPP. To confirm the size of a BSPP thread you can use the chart below. All of the threaded plumbing on our site is BSPP.

Why is it that a thread is larger than the description? BSP stands for British Standard (imperial) Pipe and BSP threads match the size of this type of pipe. As this pipe is measured and described by the internal diameter once you have added the thickness of the pipes wall then it is larger than described. For example, a 2-inch imperial pipe will have an outside diameter of about 60mm thus a 2-inch BSP thread will measure about 59mm

Nominal
Size

Outer
Diameter

Inner
Diameter
Male
Thread

Threads
Per
Inch

⅛"

9.728mm

8.566mm

28

¼"

13.157mm

11.445mm

19

⅜"

16.662mm

14.95mm

19

½"

20.995mm

18.631mm

14

⅝"

22.911mm

20.587mm

14

¾"

26.441mm

24.117mm

14

⅞"

30.201mm

27.877mm

14

1"

33.249mm

30.291mm

11

1⅛"

37.897mm

34.939mm

11

1¼"

41.91mm

38.952mm

11

1⅜"

44.323mm

41.365mm

11

1½"

47.803mm

44.845mm

11

1¾"

53.746mm

50.788mm

11

2"

59.614mm

56.656mm

11

2¼"

65.71mm

62.752mm

11

2½"

75.184mm

72.226mm

11

2¾"

81.534mm

78.576mm

11

3"

87.884mm

84.926mm

11

© Aquarium Plumbing Ltd.

The information provided in our calculations, charts, drawings and pictures was compiled to assist you in setting up your aquarium. I am sorry but we will not be held responsible for any problems that may arise from following this information.