Question About DIN Standards

DIN = Deutsche Industrie Norme (German Industry Standard).

ISO = International Standards Organisation.

EN = Euro Norm (European Standards)

There has been much harmonisation of standards in recent years. In many cases the national standard (eg DIN or BS) becomes the international standard (ISO or EN).

To put it simply, if a national standard is formally adopted outside of that country then the additional letters are added as per the previous answer. So if you are say working on a product for sale in Germany then it is only the DIN part that matters but if you hope to sell the item across the whole of Europe then you need to look for the EN part and so on. That being said, many national standards from respected organisations such as BS or DIN are accepted around the world without any formal adoption and therefore no additions to the number.

If any organization adopts any existing standard, then it adds abbreviation of that standard along with its own abbreviation. For example if European Union decides to adopt IEC (International Electrotechnical Commission) standard then it will name the standard as EN IEC...... similarly if European Standard adopts ISO standard then it is given number EN ISO.