What is DN?

DN stands for ‘Diameter Nominal’.

Put simply, it is a rough translation of mm from imperial sizes, assuming that an inch is 25mm.

We refer to a 12″ flange as DN300, when in fact it is 304mm.

Please use the table below for your reference and if you have any other questions, please ask the Just Valves team.

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½”
DN15
¾”
DN20
1″
DN25
1¼”
DN32
1½”
DN40
2″
DN50
2½”
DN65
3″
DN80
4″
DN100
5″
DN125
6″
DN150
8″
DN200
10″
DN250
12″
DN300
14″
DN350
15″
DN375
16″
DN400
18″
DN450
20″
DN500
24″
DN600

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