ISO 18418-1:2026
(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
This document 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
- Published
- Publication Date
- 11-Jan-2026
- 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
- 6060 - International Standard published
- Start Date
- 12-Jan-2026
- Due Date
- 01-Nov-2026
- Completion Date
- 12-Jan-2026
Relations
- Effective Date
- 04-Nov-2023
Overview
ISO 18418-1:2026 - Gasoline engines - High pressure liquid fuel supply connections - Part 1: 60° concave cone connectors specifies the dimensional requirements for high-pressure liquid fuel pipe end-connections used in spark ignition (gasoline) engine fuel injection systems. This international standard is applicable to externally threaded end-connections having a 60° concave cone and covers pipe end assemblies for high-pressure fuel injection pipes with outside diameters up to and including 10 mm. The aim is to ensure consistency, reliability, and interchangeability for critical fuel injection connections in automotive applications.
Key Topics
- Dimensional Requirements: The standard details the required dimensions and tolerances for 60° concave cone connectors, including thread sizes, reference diameters, bore diameters, connector length, and the depth of reference diameter planes. These ensure compatibility and proper sealing within high-pressure gasoline fuel systems.
- Applicability: ISO 18418-1:2026 applies to pipe end assemblies and connectors for gasoline engine fuel injection systems where high pressure and precise interface geometry are crucial for system integrity and performance.
- Thread Specifications: External threads must conform to ISO 261 general purpose metric threads, including tolerance classes, to guarantee reliable assembly and system integrity.
- Material & Heat Treatment: While leaving specific choices to manufacturers, the standard notes that materials and any required heat treatment should be selected based on the intended application to guarantee performance and safety.
- Operating Pressure Considerations: While high for gasoline direct injection systems (typically around 35 MPa), users must agree on the permissible working pressure, ensuring an adequate safety margin to maintain seal integrity under peak loads.
- Designation System: The standard provides a clear method for designating compliant end-connections by referencing document number, tube outside diameter, and thread type for consistent specification and ordering.
Applications
- Automotive Fuel Injection Systems: ISO 18418-1:2026 is critical for the design, manufacturing, and maintenance of high-pressure gasoline engine fuel supply systems, especially in vehicles utilizing direct injection (GDI) technology.
- Component Interchangeability: By standardizing connector dimensions and threads, the standard supports interchangeability of pipe assemblies, connectors, and ancillary fuel system components across different manufacturers and vehicle models.
- Quality Assurance: Adhering to ISO 18418-1:2026 helps ensure robust sealing, resistance to leakage, and safe operation even under the high pressures typical of modern fuel injection systems.
- OEM and Aftermarket Manufacturing: Both original equipment manufacturers and suppliers in the automotive aftermarket benefit from clearly specified connector dimensions, facilitating reliable supply chain integration and product compatibility.
Related Standards
For comprehensive compliance and system integration, refer to the following related ISO standards on fuel injection connectors and hardware:
- ISO 2974: Diesel engines - 60° concave cones for high-pressure fuel injection components
- ISO 13296: Diesel engines - High-pressure fuel injection pipe assemblies - General requirements and dimensions
- ISO 18418-2: Gasoline engines - High pressure liquid fuel supply connections - Part 2: Pipe assemblies
- ISO 21920-1: Geometrical product specifications (GPS) - Surface texture: Profile - Part 1: Indication of surface texture
- 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
Summary
Implementing ISO 18418-1:2026 ensures standardized, high-quality, and safe high-pressure pipe end connections for gasoline engine fuel injection systems. It is an essential reference for automotive engineers, fuel system designers, and component manufacturers striving for global compatibility and reliability in high-pressure gasoline injection technology.
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Frequently Asked Questions
ISO 18418-1:2026 is a standard 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: This document 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).
This document 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 18418-1:2026 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 18418-1:2026 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 18418-1:2026 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)
International
Standard
ISO 18418-1
Third edition
Gasoline engines — High pressure
2026-01
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°
Reference number
© ISO 2026
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be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
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or ISO’s member body in the country of the requester.
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Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 1
4.1 Dimensions and tolerances . .1
4.2 Materials .3
5 Operating pressure . 3
6 Designation . 3
Bibliography . 4
iii
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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
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