This part of IEC 61076 describes M12 screw-locking circular connectors with 2-way up to 17-way, for data transmission with frequencies up to 100 MHz and signal and power transmission at up to 250 V rated voltage and up to 4 A rated current per contact. These connectors consist of fixed and free connectors either rewirable or non-rewirable. Male connectors have round contacts, Ø 0,6 mm, Ø 0,76 mm, Ø 0,8 mm or Ø 1,0 mm according to number of ways and coding, all contacts with the same size. The different codings prevent the mating of differently coded male and female connectors. NOTE 1 M12 is the dimension of the thread of the screw-locking mechanism of these circular connectors. NOTE 2 The connectors are typically used for connecting industrial automation devices for process measurement and control. NOTE 3 Several other IEC standards are available covering additional styles of circular connectors with M12 × 1 screw-locking, see Bibliography.