This International Standard describes circular connectors M12 typically used for industrial process measurement and control. These connectors consist of fixed and free connectors either rewireable or non-rewireable, with screw-locking. Male connectors have round contacts . 0,6 mm, . 0,76 mm, . 0,8 mm and . 1,0 mm. The different codings prevent the mating of these coded male or female connectors to any other interfaces and cross mating between the different codings. NOTE M12 is the dimension of the thread of the screw locking mechanism of these circular connectors.