ISO 2974:2018

INTERNATIONAL ISO
STANDARD 2974
Ninth edition
2018-03
Diesel engines — 60° female cones
for high-pressure fuel injection
components
Moteurs diesels — Raccords finaux à cône femelle de 60° pour lignes
d'injection de combustible haute pression
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 Dimensions and tolerances . 2
4.2 Materials . 2
5 Designation . 2
6 Figures and tables . 3
6.1 Integral 60° female cone . 3
6.2 Fabricated 60° female cone . 7
Bibliography .10
Foreword
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URL: www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 34,
Propulsion, powertrain, and powertrain fluids.
This ninth edition cancels and replaces the eighth edition (ISO 2974:2016), of which it constitutes a
minor revision. The changes compared to the previous edition are as follows:
— the surface roughness designation in Figures 1 and 5 has been corrected to reflect Best Practices;
— minor typing errors within Figures 1 and 5 have been corrected.
iv © ISO 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 2974:2018(E)
Diesel engines — 60° female cones for high-pressure fuel
injection components
1 Scope
This document 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 (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
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 261, ISO general purpose metric screw threads — General plan
ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product
documentation
ISO 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
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
integral female cone
female cone where the sealing cone and the thread are connected in the same part
Note 1 to entry: See Figures 1 and 2.
3.2
fabricated female cone
female cone where the sealing cone and the thread are separate parts prior to joining, e.g. by welding
Note 1 to entry: See Figures 5 and 6.
3.3
reference diameter
S
baseline for dimensioning of the female cone and the pipe end form
Note 1 to entry: S can be coincident with the intended nominal sealing interface between the female cone and the
pipe end form, or not.
4 Requirements
4.1 Dimensions and tolerances
The following figures indicate the requirements for the 60° female cones at fuel injectors, CR-injectors,
fuel injection pumps, high-pressure supply pumps, and rails to allow interchangeability for high-
pressure fuel injection pipe assemblies according to ISO 13296:
— Figures 1, 2, 3, and 4 for integral female cones;
— Figures 5, 6, and 7 for fabricated female cones.
T
...