ISO 7319-2021 PDF

Full title and description

St ISO 7319-2021 — Aerospace — Fluid systems — Interface of 24° cone metric couplings. This international standard specifies the geometric interface and dimensional requirements for removable 24° cone metric couplings used in aircraft fluid systems, to ensure interchangeability of male and female coupling elements and their nuts.

Abstract

This standard defines the geometry of the interface of removable 24° cone couplings for aircraft fluid systems. It specifies the dimensions that allow interchangeability between male and female elements and the associated nut, and it defines the maximum volume of the male fitting. The document is concise and intended to support consistent mating and interchangeability of metric 24° cone fittings in aerospace applications.

General information

• Status: Published
• Publication date: 2021-06-01 (June 1, 2021)
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 49.080 (Aerospace fluid systems and components)
• Edition / version: Edition 3 (2021)
• Number of pages: 5

Scope

ISO 7319:2021 applies to removable 24° cone metric couplings used in aircraft fluid systems. It covers the interface geometry and dimensional limits necessary to guarantee interchangeability of mating parts (male, female and nut). It does not prescribe pipe-connection designs for the individual connecting elements — those may vary — but it defines the external interface dimensions and maximum male fitting volume required for compatibility across manufacturers and designs.

Key topics and requirements

• Definition of interface geometry for 24° cone metric couplings used in aerospace fluid systems.
• Dimensional specifications enabling interchangeability of male and female fittings and the connecting nut.
• Definition of maximum permissible volume of the male fitting to control internal clearances.
• Dimensional tolerances and limits necessary for consistent mating performance (seal and mechanical engagement).
• Application to removable connections; does not mandate the internal pipe-attachment design.

Typical use and users

Used by aerospace and aeronautical engineers, hydraulic/fluid system designers, original equipment manufacturers (OEMs), maintenance and overhaul organizations, procurement specialists specifying compatible fittings, and certification/test laboratories. The standard is applied when designing, specifying or verifying couplings and mating parts to ensure cross-manufacturer compatibility in aircraft fluid systems.

Related standards

ISO 7319:2021 supersedes ISO 7319:1992 (withdrawn). It is produced under ISO/TC 20/SC 10 (aerospace fluid systems and components) and is referenced by and used alongside other aerospace hydraulic and fitting standards (for example, standards addressing MJ threads and limit dimensions for fittings). Users should consult the relevant ISO/TC 20/SC 10 suite of documents and any sector- or manufacturer-specific application standards for full system requirements.

Keywords

24° cone, metric coupling, aerospace, fluid systems, fitting interface, interchangeability, male fitting volume, coupling nut, hydraulic fittings, ISO 7319

FAQ

Q: What is this standard?

A: ISO 7319:2021 is an international standard that defines the geometry and dimensional requirements for removable 24° cone metric couplings used in aircraft fluid systems to ensure interchangeability of mating parts.

Q: What does it cover?

A: It covers external interface geometry, dimensional limits and the maximum volume of the male fitting for 24° cone metric couplings; it does not prescribe the internal pipe-attachment design of individual coupling elements.

Q: Who typically uses it?

A: Aerospace engineers, OEMs, maintenance and overhaul organizations, procurement specialists, test labs and standards committees involved in design, manufacture, verification and procurement of aircraft fluid-system couplings.

Q: Is it current or superseded?

A: ISO 7319:2021 is the current (published) edition, published on 1 June 2021; it supersedes and replaces ISO 7319:1992 (withdrawn).

Q: Is it part of a series?

A: It is part of the body of ISO standards developed by ISO/TC 20/SC 10 for aerospace fluid systems and components. Related documents address associated thread and fitting dimensions and other fluid-system connection interfaces used in aerospace applications.

Q: What are the key keywords?

A: 24° cone, metric coupling, aerospace fluid systems, interchangeability, male/female fitting, coupling nut, hydraulic fitting.