Thread dimensions and equivalences

23 May 2016 / By: rmmcia

In our sector we usually find different ways for referring to a same thing, and this may give some understanding difficulties. We are talking in this article to the different way to name dimensions of different brass thread fittings, commonly used for fitting metal pipes (iron, copper) and which usual dimensions provide one of the designations.

With a simple table we show some of the common naming, due to the different designations we can find in different countries, by historical reasons or because of the own product evolution.

male thread dimensions

 

Usual equivalences

 

Nominal

Dimension (ND)

Thread Dimension

Usual Pipe Designation (internal x external)

6

 1/8

5x10

8

 1/4

8x13

10

 3/8

12x17

15

 1/2

15x21

20

 3/4

20x27

25

1

26x34

32

1 1/4

33x42

40

1 1/2

40x49

50

2

50x60

65

2 1/2

66x76

80

3

80x90

100

4

102x114

125

5

127x140

150

6

152x165

 
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