Assorted sizes BSPP Brass Bush New 

YOU CANNOT MEASURE A BSP THREAD WITH RULER/TAPE MEASURE

PHOTO FOR ILLUSTRATION PURPOSE ONLY STYLE AND DESIGN MAY DIFFER TO THE ONE SHOWN


If you have any questions regarding size issue please email and we will get back to you asap.

The threaded part(s) of plumbing fittings are made to a British Standard Pipe Thread size (BSP).  BSP sizes don’t match up with what you would measure using a ruler, which can obviously cause some confusion. For example a 3/4″ BSP thread actually measures more like 1" with a ruler.

A list of 16 thread sizes are defined by the standards, ranging from 1⁄16″ to 6″. The size was originally based on the inner diameter measured in inches of a steel tube for which the thread was intended. This often causes confusion, as people think the size refers to the outside diameter of the male thread

Parallel (straight) threads, British Standard Pipe Parallel thread (BSPP)

The table below shows dimensions for male threads.

ALL PHOTOS ARE FOR ILLUSTRATION PURPOSE/GUIDE ONLY

 

Thread

Threads per inch

Pitch mm

Outside Diameter mm

Diameter inches

1/16″

28

0.907mm

7.723mm

0.304″

1/8″

28

0.907mm

9.728mm

0.383″

1/4″

19

1.337mm

13.157mm

0.518″

3/8″

19

1.337mm

16.662mm

0.656″

1/2″

14

1.814mm

20.995mm

0.825″

5/8″

14

1.814mm

22.991mm

0.902″

3/4″

14

1.814mm

26.441mm

1.041″

1″

11

2.309mm

33.249mm

1.309″

1¼″

11

2.309mm

41.910mm

1.650″

1½″

11

2.309mm

47.803mm

1.882″

2″

11

2.309mm

59.614mm

2.347″

2½″

11

2.309mm

75.184mm

2.96″

3″

11

2.309mm

87.884mm

3.46″

4″

11

2.309mm

113.030mm

4.45″

5″

11

2.309mm

138.430mm

5.45″

6″

11

2.309mm

163.830mm

6.45″

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