ISO 7319:2021
(Main)Aerospace - Fluid systems - Interface of 24° cone metric couplings
Aerospace - Fluid systems - Interface of 24° cone metric couplings
This document defines the geometry of the interface of removable 24° cone couplings for fluid systems in aircraft. The connection with the pipe of each one of the connecting elements can be of different design. This document specifies the dimensions which allow the interchangeability of the male and female elements and of the nut used for the connection. The dimensions define the maximum volume of the male fitting.
Aéronautique et espace — Systèmes de fluides — Interface des raccordements métriques à cône de 24°
General Information
Relations
Overview
ISO 7319:2021 is an international standard developed by the International Organization for Standardization (ISO) that defines the geometry and interface specifications for removable 24° cone metric couplings used in aerospace fluid systems. Specifically intended for aircraft applications, this document standardizes the dimensions and design principles of both male and female coupling elements and the associated nut, ensuring reliable interchangeability and sealing performance. The standard provides precise dimensional tolerances that govern the maximum volume of the male fitting, facilitating compatibility among different manufacturers and designs while maintaining high safety and performance criteria vital for aerospace fluid systems.
Key Topics
- 24° Cone Coupling Geometry: The standard clearly defines the interface geometry of the couplings, focusing on the 24° cone angle that forms the sealing surface between male and female elements.
- Interchangeability: ISO 7319:2021 specifies dimensional limits and profiles to ensure that male and female coupling elements, as well as nuts, are interchangeable regardless of design variations.
- Dimension Specifications: Detailed measurements and tolerances for all relevant parts are outlined, including theoretical diameters, cone angles, radii, and thread dimensions in accordance with ISO 5855-3.
- Coupling Assembly and Sealing Principle: The document describes the three main components-female element with a 24° frustum, male element with a specialized shell, and a nut that secures the connection-and details how these work together to provide a leak-proof seal.
- Compliance with Aerospace Safety: This third edition updates prior versions, reflecting minor revisions to improve clarity while maintaining compliance with aerospace safety and performance demands.
Applications
ISO 7319:2021 is specifically designed for use in aircraft fluid systems where secure, reliable, and leak-tight connections are critical. Practical applications include:
- Aircraft Hydraulic Systems: Ensures fluid coupling interfaces provide a stable, high-pressure seal for hydraulic lines controlling flight surfaces or landing gear.
- Fuel and Lubrication Systems: Allows for standardized, maintainable connections that prevent leaks and contamination in fuel supply and engine lubrication circuits.
- Aircraft Maintenance and Repair: Facilitates easier replacement and interchangeability of coupling parts by maintenance teams, improving turnaround time and reducing the risk of incorrect fittings.
- Aerospace Manufacturing: Supports manufacturers designing aircraft fluid system components by providing a validated framework for coupling design and tolerance criteria.
Related Standards
ISO 7319:2021 references and complements other aerospace standards, particularly:
- ISO 5855-3: Governs limit dimensions for MJ threads on fittings used in aerospace fluid systems. ISO 7319 mandates that thread features conform to the requirements of ISO 5855-3 to ensure compatibility and secure connections.
- ISO 5855-1: Covers general requirements for MJ threads, providing foundational thread standards applicable across aerospace components.
- ISO/IEC Directives: The document follows the editorial and procedural rules defined by the ISO/IEC Directives to ensure consistency and quality of international standards documentation.
Summary
Implementing ISO 7319:2021 in aerospace fluid system design and maintenance guarantees standardized, reliable 24° cone metric couplings that meet stringent quality and safety requirements. This standard enhances interchangeability, facilitates effective sealing, and supports the integrity of critical fluid connections in aircraft. By adhering to these specifications, aerospace engineers and maintenance professionals can ensure optimal system performance, safety, and ease of component replacement.
Keywords: ISO 7319:2021, aerospace fluid systems, 24° cone couplings, metric coupling interface, aircraft fluid connections, coupling interchangeability, aerospace standards, MJ threads, coupling sealing, fluid system safety
Frequently Asked Questions
ISO 7319:2021 is a standard published by the International Organization for Standardization (ISO). Its full title is "Aerospace - Fluid systems - Interface of 24° cone metric couplings". This standard covers: This document defines the geometry of the interface of removable 24° cone couplings for fluid systems in aircraft. The connection with the pipe of each one of the connecting elements can be of different design. This document specifies the dimensions which allow the interchangeability of the male and female elements and of the nut used for the connection. The dimensions define the maximum volume of the male fitting.
This document defines the geometry of the interface of removable 24° cone couplings for fluid systems in aircraft. The connection with the pipe of each one of the connecting elements can be of different design. This document specifies the dimensions which allow the interchangeability of the male and female elements and of the nut used for the connection. The dimensions define the maximum volume of the male fitting.
ISO 7319:2021 is classified under the following ICS (International Classification for Standards) categories: 49.080 - Aerospace fluid systems and components. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 7319:2021 has the following relationships with other standards: It is inter standard links to ISO 7319:1992. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase ISO 7319:2021 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of ISO standards.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 7319
Third edition
2021-06
Aerospace — Fluid systems —
Interface of 24° cone metric couplings
Aéronautique et espace — Systèmes de fluides — Interface des
raccordements métriques à cône de 24°
Reference number
©
ISO 2021
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2021 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Coupling assembly and sealing principle . 1
5 Dimensions . 1
Bibliography . 5
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
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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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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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 20, Aircraft and space vehicles,
Subcommittee SC 10, Aerospace fluid systems and components.
This third edition cancels and replaces the second edition (ISO 7319:1992), of which it constitutes a
minor revision.
The main changes compared to the previous edition are as follows:
— the normative reference has been changed from dated to undated.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
INTERNATIONAL STANDARD ISO 7319:2021(E)
Aerospace — Fluid system
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