Historical
ISO 2725-3:2015
Assembly tools for screws and nuts - Square drive sockets - Part 3: Machine-operated sockets (non-impact)
ISO 2725-3:2015 specifies dimensions, designation, and marking of machine-operated "non-impact" square drive sockets.
NOTE Machine-operated "non-impact" square drive sockets are listed under number 301 in ISO 1703:1983.
International Organization for Standardization [iso]