DIN EN 10020 Definition and classification of grades of steel; German version EN 10020:2000
DIN ISO 1711-1 Assembly tools for screws and nuts - Technical specifications - Part 1: Hand-operated wrenches and sockets (ISO 1711-1:2019)*, 2021-02-01 Update
DIN ISO 691 Assembly tools for screws and nuts - Wrench and socket openings - Tolerances for general use (ISO 691:2005)
ISO 1703 Assembly tools for screws and nuts - Nomenclature*, 2018-02-01 Update