Historical
ISO 2725-2:2007
Assembly tools for screws and nuts - Square drive sockets - Part 2: Machine-operated sockets (impact)
ISO 2725-2:2007 specifies dimensions, the designation and the marking of machine-operated #8220;impact#8221; square drive sockets with operating end having a hexagonal or double hexagonal form in accordance with ISO 1174-2.
Hand-operated sockets are dealt with in ISO 2725-1.
International Organization for Standardization [iso]