BS ISO 2974:2018,Diesel engines — 60° female cones for high-pressure fuel injection components.BS ISO 2974:2018 pdf free download here.
ISO 2974:2018 specifies the dimensional requirements of end-connections for high-pressure fuel injection equipment components, used on diesel (compression-ignition) engines.
ISO 2974:2018 is applicable to externally threaded 60° female cones (see Figures 1, 2, 5, and 6) 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 (see Table 1); and
– up to and including 9 mm for fabricated female cones (see Table 2).
Details of the pipe connection ends referenced in this document are shown in ISO 13296.
2 Normative references
1SO 261, /S0 general purpose metric screw threads-General plan;
ISO 1302, Geometrical Product Specifications (GPS-Indication of surface texture in technical product documentation;
1SO 3508, Thread run-outs for fasteners with thread in accordance with ISO 261 and ISO 262;
ISO 13296, Diesel engines -High-pressure fuel injection pipe assemblies -General requirements and dimensions;
The specification of material and heat treatment shall be made according to the intended use. To ensure tightness of the joint between the connection end of the high-pressure pipe and the female cone of the mating part of pump, injector, or rail for the initial assembly as well as for repeated assemblies, the necessary plastic deformation shall take place at the sealing face of the high-pressure pipe.

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