ISO 18418-1:2016
(Main)Gasoline engines - Medium pressure liquid fuel supply connections - Part 1: 60° female cone connectors
Gasoline engines - Medium pressure liquid fuel supply connections - Part 1: 60° female cone connectors
ISO 18418-1:2016 specifies the dimensional requirements of medium-pressure pipe end-connections for gasoline (spark ignition) engine fuel injection equipment. It is applicable to externally threaded end-connections having a 60° female cone (see Figure 1), as well as to the pipe end assemblies of medium-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 moyenne pression — Partie 1: Raccords à cônes femelle de 60°
General Information
- Status
- Published
- Publication Date
- 20-Nov-2016
- 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
- 9092 - International Standard to be revised
- Start Date
- 01-Nov-2023
- Completion Date
- 13-Dec-2025
Relations
- Effective Date
- 04-Nov-2023
- Effective Date
- 05-Nov-2015
Overview
ISO 18418-1:2016 defines dimensional requirements for medium-pressure pipe end‑connections used in gasoline (spark‑ignition) engine fuel injection equipment. The standard covers externally threaded end‑connections with a 60° female cone and applies to fuel injection pipe assemblies with outside diameters up to and including 10 mm. It ensures interchangeability of connectors at rails, pumps and injectors for medium‑pressure gasoline fuel systems.
Key topics and requirements
- Connector geometry and dimensions
- Specifies the 60° female cone form and its relationship to the external thread (see Figure 1 and Table 1 in the standard).
- Covers two common sizes: pipe OD 8 mm (thread M14 × 1.5) and pipe OD 10 mm (thread M16 × 1.5), with connector length T = 11 mm and specified bore and reference plane depths.
- Thread tolerance class: 6 g for external threaded end‑connections.
- Dimensional tolerances
- Dimensions and tolerances are defined for final assembly condition (after heat treating, brazing or welding) and must be met prior to pipe assembly.
- Materials and heat treatment
- Material selection and heat treatment are to be specified according to intended use; the standard does not mandate specific alloys but requires agreement between supplier and customer.
- Operating pressure
- Permissible operating pressure is not fixed in the standard; it must be specified with an adequate safety margin and agreed between supplier and customer to ensure sealing under maximum internal pressure.
- Designation
- Clear designation format: reference to ISO 18418-1, tube outside diameter and thread (example: ISO 18418-1 - M14).
- Referenced standards
- Surface finish and related requirements reference ISO 1302 and other ISO documents.
Applications and users
ISO 18418-1 is practical for:
- Automotive OEMs and tier‑1 suppliers designing or manufacturing medium‑pressure gasoline fuel rails, pumps and injectors.
- Fuel injection pipe and connector manufacturers aiming for dimensional interchangeability.
- Design and validation engineers specifying connector dimensions, thread fit and assembly requirements.
- Quality and test laboratories verifying conformance to dimensional tolerances after heat treatment or joining.
- Maintenance, retrofit and aftermarket providers replacing or repairing fuel line components.
Use cases include direct injection (DI) gasoline systems and medium‑pressure fuel rails where reliable sealing and interchangeability of 60° female cone connectors are required.
Related standards
- ISO 2974 - Diesel 60° female cones (comparable designs)
- ISO 13296 - High‑pressure fuel injection pipe assemblies
- ISO 3508 - Thread run‑outs for ISO 261 threads
- ISO 18418-2 - Part 2: Pipe assemblies
- ISO 1302 - Surface texture specification
Keywords: ISO 18418-1, 60° female cone connectors, medium-pressure fuel injection, gasoline engines, pipe end-connections, M14, M16, thread 6g, dimensional tolerances.
Frequently Asked Questions
ISO 18418-1:2016 is a standard published by the International Organization for Standardization (ISO). Its full title is "Gasoline engines - Medium pressure liquid fuel supply connections - Part 1: 60° female cone connectors". This standard covers: ISO 18418-1:2016 specifies the dimensional requirements of medium-pressure pipe end-connections for gasoline (spark ignition) engine fuel injection equipment. It is applicable to externally threaded end-connections having a 60° female cone (see Figure 1), as well as to the pipe end assemblies of medium-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 medium-pressure pipe end-connections for gasoline (spark ignition) engine fuel injection equipment. It is applicable to externally threaded end-connections having a 60° female cone (see Figure 1), as well as to the pipe end assemblies of medium-pressure fuel injection pipes with outside diameters of up to and including 10 mm (see Table 1).
ISO 18418-1:2016 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 18418-1:2016 has the following relationships with other standards: It is inter standard links to ISO 18418-1, ISO 18418-1:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 18418-1:2016 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 ISO
STANDARD 18418-1
Second edition
2016-12-01
Gasoline engines — Medium pressure
liquid fuel supply connections —
Part 1:
60° female cone connectors
Moteurs à essence — Connexions pour des lignes de combustible
liquide à moyenne pression —
Partie 1: Raccords à cônes femelle de 60°
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
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ii © ISO 2016 – All rights reserved
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
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The committee responsible for this document is ISO/TC 22, Road vehicl
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