This part of IEC 60130 relates to circular connectors for radio and associated sound equipment. NOTE IEC 61076-2-106 specifies connectors with a similar mating interface for connectors M16x0,75 with screwlocking and degree of protection IP40 or IP65/IP67 and with M16x0,75 screw-locking accessory. As the IEC 60130-9 connector styles mating with the corresponding ones of IEC 61076-2-106 do not have a locking mechanism specified they are therefore not appropriate for industrial process measurement and control equipment. Users of this IEC 60130-9 standard should be aware that some of the IEC 61076-2-106 styles could be mated but not locked to some connector styles of this IEC 60130-9 standard.