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This part of IEC 61169, which is a Sectional Specification (SS), provides information and rules for the preparation of Detail Specifications (DS) for pin and socket R.F. coaxial connectors, with screw coupling mechanism, for low to medium power applications. The connector is commonly known as the "type N". Three versions of the 50 characteristic impedance type N connector are included, each version being mateable with each of the others. The general purpose connector (grade 2) derived from the specifications MIL-C17B and MILC- 39012 may preferably be used with R.F. cable 60096 IEC 50-7 up to about 12 GHz maximum frequency. The high performance connector (grade 1) is particularly suitable for microwave applications when lower reflection factors than are offered by the general purpose connector are required. The connectors may also be suitable for microwave components. The tolerances of the interface dimensions lie between those for grade 0 and grade 2, and are chosen to give the performance required. Some grade 1 connectors conforming to this specification may be used up to 18 GHz maximum frequency. The standard test connector (grade 0) has a closely controlled interface to provide a reference for the measurement of connectors, cable assemblies, components and equipment with the above two interfaces. It may also be used as a microwave connector in situations when the most precise interface for use up to 18 GHz maximum frequency is required. A 75 characteristic impedance connector is given in Annex A even though the use of 75 type N connectors is strongly deprecated. Accidental cross-coupling of 75 with 50 connectors can destructively damage the 75 version, but in view of the extensive use of a number of marginally different 75 versions, the interface now given provides common design guidance. 75 connectors should be clearly identified. This specification indicates the recommended performance characteristics to be considered when writing a DS and covers test schedules and inspection requirements.