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BS ISO 2725-3:2017
Assembly tools for screws and nuts. Square drive sockets. Machine-operated sockets ("non-impact") (British Standard)
ISO 2725-3:2017 specifies dimensions, designation, and marking of machine-operated "non-impact" square drive sockets.
NOTE Machine-operated "non-impact" square drive sockets covered by this document are the ones identified in ISO 1703 under reference numbers 2 2 02 01 0.
British Standards Institution [bsi]