This International Standard describes circular connectors with IP40 or IP65/67 protection degree, typically used for industrial process measurement and control. These connectors consist of fixed and free connectors, either rewireable or non-rewireable, with M16 × 0,75 screw-locking. Male connectors have round contacts ∅ 1,5 mm or ∅ 1,0 mm. NOTE IEC 60130-9, Edition 3.0 specified connectors with a similar mating interface for radio and associated sound equipment. User of this standard should be aware that some of the IEC 60130-9 style could be mated to some connector styles of this standard. However, IEC 60130-9:2011 (Edition 4.0) no longer includes these styles.