ISO 19631-2015 PDF

Full title and description

ISO 19631:2015 — Aerospace series — Tube fittings for fluid systems, 5 080 psi (35 000 kPa) — Qualification specification. This International Standard specifies qualification and baseline manufacture requirements for standard tube fittings intended for high‑pressure aircraft hydraulic systems, to ensure reliable performance under aerospace operating conditions.

Abstract

ISO 19631:2015 defines performance, testing and quality requirements for tube fittings used in aerospace fluid systems rated at 5 080 psi (35 000 kPa). It covers separable and permanent connection fittings across the common aerospace fitting size range, establishes qualification test criteria and references relevant temperature and pressure classes (see ISO 6771). The standard provides baseline acceptance criteria that manufacturers and OEMs can use to qualify fittings for use on aircraft hydraulic systems.

General information

• Status: Published (confirmed).
• Publication date: September 2015.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.080 (Aerospace engineering).
• Edition / version: Edition 1 (2015).
• Number of pages: 20 (official ISO page); some national catalogues list extended product previews showing different page counts (commonly reported as 20–32 pages in reseller listings).

Scope

ISO 19631:2015 applies to the qualification of tube fittings intended for aircraft fluid systems with a design pressure of 5 080 psi (35 000 kPa). It specifies the types and sizes of fittings covered (typical aerospace sizes, separable and permanent connections), the qualification tests manufacturers must conduct, and the minimum performance criteria required to demonstrate suitability for service. Temperature and pressure class requirements referenced in ISO 6771 are incorporated by reference. The aim is to ensure interchangeability, reliability and safety of fittings used in hydraulic and other fluid systems on aerospace platforms.

Key topics and requirements

• Qualification testing program for tube fittings used in aerospace hydraulic systems, including pressure and endurance tests.
• Designation of the pressure rating: 5 080 psi (35 000 kPa) and associated test loads and acceptance criteria.
• Range of sizes covered (commonly expressed in aerospace dash sizes, e.g., −04 to −20) and types: separable/permanent pipe end fittings, separable connection fittings, permanent connection fittings.
• Reference to temperature and pressure classes as specified in related standards (ISO 6771).
• Manufacturing and quality-control expectations for repeatable, qualified production parts (documentation, traceability, marking).
• Conformance criteria and reporting format for qualification test results.

Typical use and users

Primary users are aerospace OEMs, aircraft and engine manufacturers, suppliers of hydraulic tube fittings and connectors, qualification/test laboratories, design and certification engineers, and maintenance/regulatory organizations concerned with fluid‑system safety and reliability. The standard is used to qualify new fitting designs, to set procurement acceptance criteria, and to standardize qualification testing across the supply chain.

Related standards

ISO 19631 forms part of the ISO aerospace series addressing fittings and fluid systems. Key related documents include ISO 6771 (temperature and pressure classes referenced by ISO 19631), and other aerospace series standards on fittings and hose assemblies such as ISO 19632 and ISO 8829; national/adopted versions (e.g., BS ISO 19631) and other aerospace specifications provide complementary design and test methods. Users should consult the referenced standards for complete test conditions and class definitions.

Keywords

ISO 19631, tube fittings, fluid systems, aerospace, hydraulic fittings, 5080 psi, 35 000 kPa, qualification specification, fitting qualification, ISO/TC 20/SC 10, pressure class, aerospace fittings.

FAQ

Q: What is this standard?

A: ISO 19631:2015 is an International Standard in the aerospace series that sets qualification requirements for tube fittings used in aircraft fluid systems rated at 5 080 psi (35 000 kPa).

Q: What does it cover?

A: It covers qualification test programs, performance and acceptance criteria, and baseline manufacturing/quality requirements for separable and permanent tube fittings across common aerospace sizes, and references applicable temperature and pressure classes.

Q: Who typically uses it?

A: Aerospace OEMs, fitting manufacturers and suppliers, test laboratories, design and certification engineers, and procurement/quality teams use the standard to qualify fittings and define procurement acceptance criteria.

Q: Is it current or superseded?

A: As published in September 2015 (Edition 1), ISO 19631:2015 is published and was confirmed in its review; users should verify the current status with their national standards body if absolute up‑to‑date confirmation is required.

Q: Is it part of a series?

A: Yes — it is part of ISO's aerospace series of standards for fluid systems and fittings; it cross‑references other aerospace fitting and hose standards (for example ISO 6771, ISO 8829 and related documents) that together define design, test and acceptance practices for aircraft fluid‑system components.

Q: What are the key keywords?

A: Tube fittings, aerospace, hydraulic fittings, qualification, 5 080 psi, 35 000 kPa, ISO 19631, fitting sizes, test methods, ISO/TC20/SC10.