ISO 2974:2013 specifies the dimensional requirements of end-connections for high-pressure fuel injection equipment components used on diesel (compression-ignition) engines. It is applicable to externally threaded 60? female cones and intended for use with high-pressure fuel injection pipe assemblies with tube outside diameters of up to and including 12 mm for integral female cones, and up to and including 9 mm for fabricated female cones. Details of the pipe connection ends referenced in this document are shown in ISO 13296.