ISO 19632:2015

Aerospace series - Fitting end, 24° internal cone, external thread, flareless type extra fine thread pitch inch series - Design standard

ISO 19632:2015 specifies the dimensions, tolerances and the required characteristics of a fitting end, 24° cone, external thread, flareless type, size ‑04 up to ‑20 for use in hydraulic and fluid systems at 35 000 kPa (5 080 psi), diameter 6,35 mm ≤ D ≤ 31,75 mm (1/4 inch ≤ D ≤ 1 1/4 inch) for aerospace applications. This is a design standard.

Série aérospatiale — Raccord, cône interne à 24°, filetage externe, de type sans épanoui, filetage à pas extra fin, série inch — Norme de conception

General Information

• Status: Published
• Publication Date: 08-Jul-2015
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: ISO/TC 20/SC 10 - Aerospace fluid systems and components
• Drafting Committee: ISO/TC 20/SC 10 - Aerospace fluid systems and components
• Current Stage: 9093 - International Standard confirmed
• Start Date: 19-Nov-2021
• Completion Date: 13-Dec-2025

Overview

ISO 19632:2015 is an ISO aerospace design standard that specifies the configuration, dimensions, tolerances and required characteristics of a flareless fitting end with a 24° internal cone and external extra‑fine thread (inch series) for aerospace hydraulic and fluid systems. The standard covers sizes ‑04 to ‑20 (tube diameters 6.35 mm to 31.75 mm / 1/4" to 1 1/4") and is intended for systems rated to 35 000 kPa (5 080 psi). ISO 19632:2015 is a design standard (not a test procedure) and includes drawings (Figures 1–5) and dimensional tables (Tables 1–2).

Key topics

• Fitting geometry and styles: configuration details for styles G, B, E and optional F; notes on which styles are suitable for port fittings (e.g., style E appropriate for port fitting; some styles are not).
• Sealing surface and 24° internal cone: definition of the cone sealing interface essential to flareless fitting performance.
• Thread specification: external thread “T” per ISO 3161 (UNJ threads) with extra‑fine pitch (inch series); thread class and gauge references shown in tables and notes.
• Dimensions and tolerances: tabulated diameters and feature dimensions in both millimetre and inch with specified tolerances - linear ±0.25 mm (±0.010 in), angular ±0°30′, and tighter tolerances on critical diameters (see Table 1).
• Wrench pad sizing: recommended and possible wrench sizes, tolerances and weight‑saving recommendations (Table 2).
• Designation and documentation: rules for designation and reference to normative documents.

Applications

ISO 19632:2015 is used to design and specify aerospace hydraulic/fluid fittings where interchangeability, pressure integrity and precise thread/cone mating are critical. Typical applications include:

• Aerospace hydraulic hose ends, adapters and connectors
• Aircraft fluid distribution systems (actuation, landing gear, flight controls)
• Component design for aerospace OEMs and suppliers
• Engineering drawings, CAD models and parts lists requiring compliant dimensions

Who uses it:

• Aerospace design engineers and CAD designers
• Component manufacturers and CNC tooling engineers
• Quality, inspection and metrology personnel (gauge reference points are defined)
• Procurement and specification writers ensuring part conformity

Related standards

• ISO 3161 - referenced for UNJ thread general requirements and limit dimensions (normative reference).
• ISO/TC 20 (Aircraft and space vehicles) committee publications and ISO/IEC Directives for units and drafting conventions.

Keywords: ISO 19632:2015, aerospace fittings, 24° internal cone, flareless fitting, extra fine thread, UNJ thread, hydraulic systems, design standard, dimensions and tolerances.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 19632
First edition
2015-07-15
Aerospace series — Fitting end,
24° internal cone, external thread,
flareless type extra fine thread pitch
inch series — Design standard
Série aérospatiale — Raccord, cône interne à 24°, filetage externe,
de type sans épanoui, filetage à pas extra fin, série inch — Norme
de conception
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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ii © ISO 2015 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Required characteristics — Configuration, dimensions and tolerances .1
4 Designation . 7
Foreword
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electrotechnical standardization.
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Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 10, Aerospace fluid systems and components.
iv © ISO 2015 – All rights reserved

Introduction
International Standards use the International system of units (SI); however, large segments of the
aerospace industry make use of other measurement systems as a matter of common working practice.
All dimensions and units used in this International Standard are given in SI units, with other units also
indicated for the convenience of the user.
The decimal sign used in International Standards is the comma (“,”); however, the comma is not used in
common working practice with non-SI dimensions. Therefore, in common with many other aerospace
standards, the decimal point (“.”) is used in this International Standard when providing dimensions in
inch-pound units.
NOTE The use of non-SI units and the decimal point in this International Standard does not constitute
general acceptance of measurement systems other than SI within International Standards.
INTERNATIONAL STANDARD ISO 19632:2015(E)
Aerospace series — Fitting end, 24° internal cone, external
thread, flareless type extra fine thread pitch inch series —
Design standard
1 Scope
This International Sta
...