ISO 18418-1
(Main)Gasoline engines - High pressure liquid fuel supply connections - Part 1: 60° concave cone connectors
Gasoline engines - High pressure liquid fuel supply connections - Part 1: 60° concave cone connectors
ISO 18418-1:2016 specifies the dimensional requirements of high-pressure liquid fuel pipe end-connections for gasoline (spark ignition) engine fuel injection equipment. It is applicable to externally threaded end-connections having a 60° concave cone (see Figure 1), as well as to the pipe end assemblies of high-pressure fuel injection pipes with outside diameters of up to and including 10 mm (see Table 1).
Moteurs à essence — Connexions pour des lignes de combustible liquide à haute pression — Partie 1: Raccords à cônes concave de 60°
General Information
- Status
- Not Published
- Technical Committee
- ISO/TC 22/SC 34 - Propulsion, powertrain and powertrain fluids
- Drafting Committee
- ISO/TC 22/SC 34/WG 2 - Injection equipment
- Current Stage
- 6000 - International Standard under publication
- Start Date
- 04-Dec-2025
- Completion Date
- 13-Dec-2025
Relations
- Effective Date
- 04-Nov-2023
Overview
ISO 18418-1:2024 establishes the dimensional requirements for high-pressure liquid fuel supply connections used in gasoline (spark ignition) engine fuel injection systems. Specifically, it covers externally threaded end-connections that feature a 60° concave cone design for high-pressure fuel pipes up to 10 mm in outside diameter. This standard plays a crucial role in ensuring interchangeability, safety, and reliability of fuel injection components, supporting the growing adoption of gasoline direct injection (GDI) technologies operating at pressures around 35 MPa.
Developed by ISO Technical Committee ISO/TC 22/SC 34, ISO 18418-1 supports harmonization of connector interfaces to facilitate manufacturing consistency, component compatibility, and enhanced engine performance.
Key Topics
- Scope & Application: Applies to externally threaded pipe end-connections with 60° concave cones for fuel injection pipes up to 10 mm outer diameter.
- Dimensional Specifications: Precise tolerances and dimensions for cone angles, thread sizes (e.g., M14, M16 per ISO 261), and connector lengths ensure secure and leak-free assemblies.
- Materials & Treatments: Selection based on service conditions with consideration for heat treatments to maintain mechanical strength and durability.
- Operating Pressure: Design pressures include adequate safety margins to prevent leaks and withstand maximum internal fuel system pressures.
- Designation Format: Standardized coding includes the document number, tube outside diameter, and thread designation for clear identification.
- Interchangeability: Compatibility with related standards like ISO 2974 (diesel fuel injection connectors) supports seamless integration across different engine types.
Applications
ISO 18418-1 is essential for manufacturers, engineers, and quality assurance professionals involved with:
- Gasoline Direct Injection (GDI) Systems: Ensures reliable connections in high-pressure fuel lines crucial for precise fuel delivery and emissions control.
- Fuel Injection Pipe Assemblies: Guides the design and verification of pipe end fittings for high-pressure fuel pumps and rails.
- Engine Component Manufacturing: Improves standardization of high-pressure fuel supply line interfaces to streamline production and maintenance.
- Aftermarket and Replacement Parts: Provides specifications ensuring backward compatibility and correct fit of replacement connectors.
- Safety and Performance Assurance: Helps maintain fuel system integrity, reducing risks of leaks, failures, and performance degradation under high-pressure conditions.
Related Standards
ISO 18418-1 references and complements several key ISO standards, including:
- ISO 2974 – Diesel engine 60° concave cone connectors for high-pressure fuel injection components.
- ISO 13296 – Diesel engines high-pressure fuel injection pipe assemblies - general requirements and dimensions.
- ISO 261 – General plan for metric screw threads (thread designations used in connectors).
- ISO 18418-2 – Gasoline engines high-pressure liquid fuel supply connections - Part 2: Pipe assemblies.
- ISO 21920-1 – Surface texture specifications critical for sealing surfaces in connectors.
These related documents help unify high-pressure fuel system components between gasoline and diesel engines and promote global interoperability.
Keywords: ISO 18418-1, high pressure liquid fuel supply connections, gasoline engines, spark ignition engines, fuel injection connectors, 60° concave cone, high-pressure fuel pipes, GDI fuel systems, fuel injection components, ISO metric threads, fuel system safety, injector pipe fittings, automotive fuel standards.
ISO/FDIS 18418-1 - Gasoline engines — High pressure liquid fuel supply connections — Part 1: 60° concave cone connectors Released:9/24/2025
REDLINE ISO/FDIS 18418-1 - Gasoline engines — High pressure liquid fuel supply connections — Part 1: 60° concave cone connectors Released:9/24/2025
Frequently Asked Questions
ISO 18418-1 is a draft published by the International Organization for Standardization (ISO). Its full title is "Gasoline engines - High pressure liquid fuel supply connections - Part 1: 60° concave cone connectors". This standard covers: ISO 18418-1:2016 specifies the dimensional requirements of high-pressure liquid fuel pipe end-connections for gasoline (spark ignition) engine fuel injection equipment. It is applicable to externally threaded end-connections having a 60° concave cone (see Figure 1), as well as to the pipe end assemblies of high-pressure fuel injection pipes with outside diameters of up to and including 10 mm (see Table 1).
ISO 18418-1:2016 specifies the dimensional requirements of high-pressure liquid fuel pipe end-connections for gasoline (spark ignition) engine fuel injection equipment. It is applicable to externally threaded end-connections having a 60° concave cone (see Figure 1), as well as to the pipe end assemblies of high-pressure fuel injection pipes with outside diameters of up to and including 10 mm (see Table 1).
ISO 18418-1 is classified under the following ICS (International Classification for Standards) categories: 43.060.40 - Fuel systems. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 18418-1 has the following relationships with other standards: It is inter standard links to ISO 18418-1:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 18418-1 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
FINAL DRAFT
International
Standard
ISO/FDIS 18418-1
ISO/TC 22/SC 34
Gasoline engines — High pressure
Secretariat: JISC
liquid fuel supply connections —
Voting begins on:
2025-10-08
Part 1:
60° concave cone connectors
Voting terminates on:
2025-12-03
Moteurs à essence — Connexions pour des lignes de combustible
liquide à haute pression —
Partie 1: Raccords à cônes concave de 60°
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 18418-1:2025(en) © ISO 2025
FINAL DRAFT
ISO/FDIS 18418-1:2025(en)
International
Standard
ISO/FDIS 18418-1
ISO/TC 22/SC 34
Gasoline engines — High pressure
Secretariat: JISC
liquid fuel supply connections —
Voting begins on:
Part 1:
60° concave cone connectors
Voting terminates on:
Moteurs à essence — Connexions pour des lignes de combustible
liquide à haute pression —
Partie 1: Raccords à cônes concave de 60°
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 18418-1:2025(en) © ISO 2025
ii
ISO/FDIS 18418-1:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirement . 1
4.1 Dimensions and tolerances . .1
4.2 Materials .3
5 Operating pressure . 3
6 Designation . 3
Bibliography . 4
iii
ISO/FDIS 18418-1:2025(en)
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso
...
nd
ISO/2 DISFDIS 18418-1
ISO/TC 22/SC 34
Secretariat: ANSIJISC
Date: 2024-11-26
Gasoline engines — High -pressure liquid fuel supply connections —
Part 1:
60° concave cone connectors
Moteurs à essence — Connexions pour des lignes de combustible liquide à haute pression —
Partie 1: Raccords à cônes concave de 60°
DISFDIS stage
Warning for WD’s and CD’s
This document is not an ISO International Standard. It is distributed for review and comment. It is subject to change
without notice and may not be referred to as an International Standard.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which
they are aware and to provide supporting documentation.
CONFIDECONFIDENNTTIALIAL
nd
ISO/2 DISFDIS 18418-1:20242025(en)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
E-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
iii
nd
ISO/2 DISFDIS 18418-1:20242025(en)
Contents
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirement . 1
4.1 Dimensions and tolerances . 1
4.2 Materials . 4
5 Operating pressure . 4
6 Designation . 4
Bibliography . 5
iv
nd
ISO/2 DISFDIS 18418-1:20242025(en)
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see 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 third edition cancels and replaces the second edition (ISO 18418-1:2016), which has been technically
revised.
The main changes are as follows:
— title of the document was aligned with the rest of the series;
— language inclusivity was improved.
A list of all parts in the ISO 18418 series can be found on the ISO website.
Any feedbac
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...