Country, region and language selection

International websites


Americas / Oceania

Africa and Middle East

Asia / Pacific

Nominal diameter

The nominal diameter is referred to as the pipe diameter or the mating dimension of a valve (with valves this is usually referred to as the nominal size). In combination with the nominal pressure the approximate inside diameter is specified in millimetres to ISO 6708 in the form of a dimensionless figure, preceded by the designation DN (DN 100).
The table "Nominal diameters to DIN 2402" provides an overview. It does not specify numerical values. See Fig. 1 DN



Become part of our team!

Become part of our team!

As an international employer, KSB offers exciting challenges in many different areas.

Regardless whether you are an experienced professional or a pupil, student or graduate ─ learn more about our work culture and find job openings from all over the world in our job portal.