Historical
IEC 61076-2-101 Ed. 2.0 b:2008
Connectors for electronic equipment - Product requirements - Part 2-101: Circular connectors - Detail specification for M12 connectors with screw-locking
"IEC 61076-2-101:2008 describes circular connectors M12 typically used for industrial process measurement and control. These connectors consist of fixed and free connectors with screw-locking. Male connectors have round contacts of diameters 0,6 mm, 0,76 mm, 0,8 mm and 1,0 mm. This new edition includes the following significant technical change with respect to the previous edition: the connector type M8 has been removed from IEC 61076-2-101 and has been published in a separate IEC Standard under reference IEC 61076-2-104."
International Electrotechnical Commission [iec]