DIN standards

April 12, 2021

Over the years, many DIN standards have been replaced by internationally valid DIN EN ISO standards. Many DIN standards were the basis for ISO standards. Minor changes to the DIN standards were often made to create the ISO standards that are currently in force. When an ISO standard is adopted without changes in the national standardization body, the national standard retains the same designation as the respective ISO standard. The only change is the addition of the abbreviation DIN EN to the designation. In the past, this standardization work in Germany was carried out nationally by the Deutscher Institut für Normung e. V. (DIN), or by the German Institute for Standardization. At European level there are also EN standards and at international level ISO standards, issued by the International Organization for Standardization.

DIN
National standards (DIN) are/have been largely replaced by international/European standards. DIN standards will continue to exist only for those products for which there are no ISO or EN standards.

ISO
International standards (ISO) serve to standardize worldwide technical rules according to the functions and objectives of the ISO standard created in 1946, which simplifies the exchange of goods and eliminates trade barriers.

EN
European standards (EN) aim at harmonizing technical rules and laws in the European Single Market (EU/EEC) since 01/01/95. Existing ISO standards should be adopted without modification (as far as possible) as EN standards. The difference between ISO and EN standards is that EN standards must be adopted and introduced immediately and without change as national standards after approval by the European Commission, while the respective national standards must be withdrawn.

Identification according to DIN 267
This is made by two digits on the bolt and one on the nut. The first digit multiplied by 100 gives the material's tensile strength (fuk) in Mpa. Multiplying by 10 the product of the first by the second we obtain the material yield limit (fyk) in Mpa. On the nuts, only the digit indicating the tensile strength appears.