ISO 2974:2013

INTERNATIONAL ISO
STANDARD 2974
Seventh edition
2013-03-01
Diesel engines — 60 degree female
cones for high-pressure fuel
injection components
Moteurs diesels — Raccords finaux à cône femelle de 60 degrés pour
lignes d’injection de combustible haute pression
Reference number
ISO 2974:2013(E)
©
ISO 2013

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ISO 2974:2013(E)

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ii © ISO 2013 – All rights reserved

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ISO 2974:2013(E)

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 . 9
© ISO 2013 – All rights reserved iii

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ISO 2974:2013(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International
Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies
casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 2974 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 7, Injection
equipment and filters for use on road vehicles.
This seventh edition cancels and replaces the sixth edition (ISO 2974:2005), of which it constitutes a
minor revision.
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INTERNATIONAL STANDARD ISO 2974:2013(E)
Diesel engines — 60 degree female cones for high-pressure
fuel injection components
1 Scope
This International Standard 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, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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 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.
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 may or may not be coincident with the intended nominal sealing interface between the female
cone and the pipe end form.
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ISO 2974:2013(E)

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.
The 60° female cone and its relationship to the external thread shall meet the requirements of Figure 1
(integral female cones) or Figure 5 (fabricated female cones). However, for integral female cones,
variations at the smaller end of the female cone as shown in Figure 3 are acceptable.
Dimensions and tolerances are given in Table 1 (integral female cones) and Table 2 (fabricated female
cones). Unspecified details are left to the manufacturer’s choice.
With reference dimension T in Figures 1, 2, 5, and 6, the external thread may be either with or without
undercut. However, it shall be possible to screw the GO-gauge for the thread up to the plane specified
by dimension T.
Figure 4 and Figure 7 show the assemblies with pipe end connections for the integral and fabricated
female cone types, respectively.
4.2 Materials
The specification of material and
...