IEC61169-11:2017(E), which is a sectional specification (SS), provides information and rules for the preparation of detail specifications (DS) for RF coaxial connectors with threaded coupling, typically for use in 50 Ohms cable networks (type 4,1-9,5).This document prescribes mating face dimensions for general purpose connectors – grade 2, dimensional details of standard test connectors-grade 0, gauging information and tests selected from IEC61169-1, applicable to all detail specifications relating to series 4,1-9,5 RF connectors.This specification indicates recommended performance characteristics to be considered when writing a detail specification and it covers test schedules and inspection requirements for assessment levels M and H.The 4,1-9,5 types RF coaxial connectors with nominal impedance 50 Ohms are threaded coupling units which are used with all kinds of RF cables and microstrips in microwave transmission systems. And the working frequency is up to 14GHz.