Assembly tools for screws and nuts -- Technical specifications -- Part 1: Hand-operated wrenches and sockets
ISO 1711-1:2007 specifies minimum values for Rockwell hardness and torsional strength for hand-operated wrenches and sockets.
It covers three series of torsion torques:
- Series A: usual box wrenches and socket wrenches;
- Series C: open end wrenches;
- Series E: hand-operated square drive sockets.