ISO 18487-1:2025
(Main)Aerospace series — Titanium tube for 35 MPa operating pressure — Part 1: Inch series
Aerospace series — Titanium tube for 35 MPa operating pressure — Part 1: Inch series
This document is applicable to seamless tubing of circular cross-section made from titanium alloy and intended for use primarily in systems with system operating pressure of 35 MPa (5 080 psi) (Pressure Class J), but usage is not limited to such applications.
Série aérospatiale — Tubes en titane — Pression de service : 35 MPa — Partie 1: Série en inches
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International
Standard
ISO 18487-1
Second edition
Aerospace series — Titanium tube
2025-07
for 35 MPa operating pressure —
Part 1:
Inch series
Série aérospatiale — Tubes en titane — Pression de service :
35 MPa —
Partie 1: Série en inches
Reference number
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Dimensions . 2
5 Tolerances . 2
6 Technical requirements . 3
6.1 General .3
6.2 Composition .3
6.3 Melting practice .3
6.4 Heat treatment and delivery condition.3
6.5 Tensile properties .3
6.6 Microstructure .4
6.6.1 General .4
6.6.2 Grain size .4
6.6.3 Contractile strain ratio (CSR).4
6.7 Surface condition and texture .4
6.7.1 Surface treatment .4
6.7.2 Surface condition .4
6.7.3 Surface texture, R .5
a
6.8 Ultrasonic inspection.5
6.9 Flarability . .5
6.9.1 General .5
6.9.2 Surface contamination .5
6.10 Bending .7
6.11 Flattening .7
6.12 Deformation under pressure test .7
6.13 Impulse pressure fatigue test .8
6.13.1 General .8
6.13.2 Proof test .8
6.13.3 Pressure impulse test .8
6.13.4 Additional test .11
6.13.5 Ultimate (as per CS 25.1435) and burst test .11
7 Quality assurance .12
8 Preparation for delivery .12
8.1 Marking . 12
8.2 Packing . 12
Bibliography .13
iii
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 committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. 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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the 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 second edition cancels and replaces the first edition (ISO 18487-1:2017), of which it constitutes a minor
revision.
The changes are as follows:
— the normative reference to ISO 4287, which is withdrawn, has been replaced by ISO 21920-2;
— the normative reference to ISO 8575:2016, which is withdrawn, has been replaced by ISO 8575:2024.
A list of all the parts in the ISO 18487 series can be found on the ISO website.
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
Introduction
This document is intended to harmonize the technical requirements for titanium tubes used in aerospace
with design operating pressure of 35 MPa.
It is noted that, while ISO standards should normally refer only to SI units, large segments of the aerospace
industry refer to other measurement systems as a matter of common working practice. The mention of “inch
series” in the title of this document reflects this. It recognizes the fact that the nominal sizes referred to
in the document, which are in common use in the aerospace industry, were originally defined in terms of
fractional inches.
Although the tube sizes were originally defined, and are frequently referred to, in terms of non-SI units, all
dimensions used in this document are in SI units with inch units given in addition for the convenience of
those users more familiar with these.
It is further noted that the standard ISO decimal symbol “,” (comma) is not used as common working practice
for inch dimensions. A decimal point is used in the inch dimensions in this document as in many other
aerospace standards.
NOTE The use of non-SI units and the decimal point in this document does not constitute general acceptance of
measurement systems other than SI within International Standards.
v
International Standard ISO 18487-1:2025(en)
Aerospace series — Titanium tube for 35 MPa operating
pressure —
Part 1:
Inch series
1 Scope
This document is applicable to seamless tubing of circular cross-section made from titanium alloy and
intended for use primarily in systems with system operating pressure of 35 MPa (5 080 psi) (Pressure Class
J), but usage is not limited to such applications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 21920-2, Geometrical product specifications (GPS) — Surface texture: Profile — Part 2: Terms, definitions
and surface texture parameters
ISO 6772, Aerospace — Fluid systems — Impulse testing of hydraulic hose, tubing and fitting assemblies
ISO 8492, Metallic materials — Tube — F
...
FINAL DRAFT
International
Standard
ISO/FDIS 18487-1
ISO/TC 20/SC 10
Aerospace series — Titanium tube
Secretariat: DIN
for 35 MPa operating pressure —
Voting begins on:
Part 1:
Inch series
Voting terminates on:
Série aérospatiale — Tubes en titane — Pression de service : 35
MPa —
Partie 1: Série en inches
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 18487-1:2025(en) © ISO 2025
FINAL DRAFT
ISO/FDIS 18487-1:2025(en)
International
Standard
ISO/FDIS 18487-1
ISO/TC 20/SC 10
Aerospace series — Titanium tube
Secretariat: DIN
for 35 MPa operating pressure —
Voting begins on:
Part 1:
Inch series
Voting terminates on:
Série aérospatiale — Tubes en titane — Pression de service :
35 MPa —
Partie 1: Série en inches
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 18487-1:2025(en) © ISO 2025
ii
ISO/FDIS 18487-1:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Dimensions . 2
5 Tolerances . 2
6 Technical requirements . 3
6.1 General .3
6.2 Composition .3
6.3 Melting practice .3
6.4 Heat treatment and delivery condition.3
6.5 Tensile properties .3
6.6 Microstructure .4
6.6.1 General .4
6.6.2 Grain size .4
6.6.3 Contractile strain ratio (CSR).4
6.7 Surface condition and texture .4
6.7.1 Surface treatment .4
6.7.2 Surface condition .4
6.7.3 Surface texture, R .5
a
6.8 Ultrasonic inspection.5
6.9 Flarability . .5
6.9.1 General .5
6.9.2 Surface contamination .5
6.10 Bending .7
6.11 Flattening .7
6.12 Deformation under pressure test .7
6.13 Impulse pressure fatigue test .8
6.13.1 General .8
6.13.2 Proof test .8
6.13.3 Pressure impulse test .8
6.13.4 Additional test .11
6.13.5 Ultimate (as per CS 25.1435) and burst test .11
7 Quality assurance .12
8 Preparation for delivery .12
8.1 Marking . 12
8.2 Packing . 12
Bibliography .13
iii
ISO/FDIS 18487-1:2025(en)
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 committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. 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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the 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 second edition cancels and replaces the first edition (ISO 18487-1:2017), of which it constitutes a minor
revision.
The changes are as follows:
— the normative reference to ISO 4287, which is withdrawn, has been replaced by ISO 21920-2;
— the normative reference to ISO 8575:2016, which is withdrawn, has been replaced by ISO 8575:2024.
A list of all the parts in the ISO 18487 series can be found on the ISO website.
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/FDIS 18487-1:2025(en)
Introduction
This document is intended to harmonize the technical requirements for titanium tubes used in aerospace
with design operating pressure of 35 MPa.
It is noted that, while ISO standards should normally refer only to SI units, large segments of the aerospace
industry refer to other measurement systems as a matter of common working practice. The mention of “inch
series” in the title of this document reflects this. It recognizes the fact that the nominal sizes referred to
in the document, which are in common use in the aerospace industry, were originally defined in terms of
fractional inches.
Although the tube sizes were originally defined, and are frequently referred to, in terms of non-SI units, all
dimensions used in this document are in SI units with inch units given in addition for the convenience of
those users more familiar with these.
It is further noted that the standard ISO decimal symbol “,” (comma) is not used as common worki
...
ISO/TC 20/SC 10
ISO/FDIS 18487-1:2025(E)
ISO/TC 20/SC 10
Secretariat: DIN
Date: 2025-03-31
Aerospace series — Titanium Tubetube for 35 MPa operating
pressure —
Part 1:
Inch Seriesseries
Série aérospatiale – — Tubes en titane –— Pression de service : 35 MPa – —
Partie 1: Série en inches
FDIS stage
ISO/FDIS 18487-1:2025(E)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. Phone: + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ISO/FDIS 18487-1:2025(Een)
Contents Page
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Dimensions . 3
5 Tolerances . 3
6 Technical requirements . 3
6.1 General . 3
6.2 Composition . 3
6.3 Melting practice . 4
6.4 Heat treatment and delivery condition . 4
6.5 Tensile properties . 4
6.6 Microstructure . 4
6.7 Surface condition and texture . 5
6.8 Ultrasonic inspection . 5
6.9 Flarability . 6
6.10 Bending . 8
6.11 Flattening . 8
6.12 Deformation under pressure test . 9
6.13 Impulse pressure fatigue test . 9
7 Quality assurance . 16
8 Preparation for delivery . 16
8.1 Marking . 16
8.2 Packing . 16
Bibliography . 17
iv
ISO/FDIS 18487-1:2025(Een)
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 committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. 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 documentsdocument 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 drawnISO draws attention to the possibility that some of the elementsimplementation of this
document may beinvolve the subjectuse of (a) patent(s). ISO takes no position concerning the evidence,
validity or applicability of any claimed patent rights in respect thereof. As of the date of publication of this
document, ISO had not received notice of (a) patent(s) which may be required to implement this document.
However, implementers are cautioned that this may not represent the latest information, which may be
obtained from the patent database available at www.iso.org/patents. ISO shall not be held responsible for
identifying any or all such patent rights. Details of any patent rights identified during the development of the
document will be in the Introduction and/or on the ISO list of patent declarations received (see ).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation onof the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT)), see
www.iso.org/iso/foreword.htmlthe following URL: .
This document was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 10, Aerospace fluid systems and components.
This second edition cancels and replaces the first edition (ISO 1849718487-1:2017), of which it constitutes a
minor revision.
The main changes compared to the previous edition are as follows:
— — Normative Reference changed from dated, to undated edition.
— the normative reference to ISO 4287, which is withdrawn, has been replaced by ISO 21920-2;
— the normative reference to ISO 8575:2016, which is withdrawn, has been replaced by ISO 8575:2024.
A list of all the parts in the ISO 18487 series can be found on the ISO website.
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.
v
ISO/FDIS 18487-1:2025(Een)
Introduction
This document is intended to harmonize the technical requirements for titanium tubes used in aerospace with
design operating pressure of 35 MPa.
It is noted that, while ISO standards should normally refer only to SI units, large segments of the aerospace
industry refer to other measurement systems as a matter of common working practice. The mention of “inch
series” in the title of this document reflects this. It recognizes the fact that the nominal sizes referred to in the
document, which are in common use in the aerospace industry, were originally defined in terms of fractional
inches.
Although the tube sizes were originally defined, and are frequently referred to, in terms of non-SI units, all
dimensions used in this document are in SI units with inch units given in addition for the convenience of those
users more familiar with these.
It is further noted that the standard ISO decimal symbol “,” (comma) is not used as common working practice
for inch dimensions. A decimal point is used in the inch dimensions in this document as in many other
aerospace standards.
NOTE The use of non-SI units and the decimal point in this document does not constitute general acceptance of
measurement systems other than SI within International Standards.
vi
ISO/FDIS 18487-1:2025(E)
Aerospace series — Titanium Tubetube for 35 MPa operating
pressure — Part 1: Inch Series
Part 1:
Inch series
1 Scope
This document is applicable to seamless tubing of circular cross-section made from titanium alloy and
intended for use primarily in systems with system operating pressure of 35 MPa (5 080 psi) (Pressure Class
J), but usage is not limited to such applications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 428721920-2, Geometrical Product Specificationsproduct specifications (GPS) — Surface texture: Profile
method —— Part 2: Terms, definitions and surface texture parameters
ISO 6772, Aerospace — Fluid systems — Impulse testing of hydraulic hose, tubing and fitting assemblies
ISO 8492, Metallic materials — Tube — Flattening test
ISO 8575:2024, Aerospace series — Fluid systems — Hydraulic system tubing
ISO 10583, Aerospace fluid systems — Test methods for tube/fitting assemblies
ISO 12573, Aircraft — Tubing tolerances — Inch series
EN 2003--010, Aerospace series — Titanium and titanium alloys — Test methods — Part 010: Sampling for
determination of hydrogen content
EN 3718, Aerospace series — Test method for metallic materials — Ultrasonic inspection of tubes
AS 4076, Contractile strain ratio testing of titanium hydraulic tubing
AMS 2634, Ultrasonic inspection, thin wall metal tubing superseding
ASTM E112, Standard test methods for determining average grain size
ASTM E1409, Standard test method for determination of oxygen and nitrogen in titanium and titanium alloys by
inert gas fusion
ASTM E1941, Standard test method for determination of carbon in refractory and reactive metals and their
alloys by combustion analysis
ASTM E1447, Standard test method for determination of hydrogen in titanium and titanium alloys by the inert
gas fusion thermal conductivity/infrared detection method
ASTM E2371, Standard test method for analysis of titanium and titanium alloys by direct current plasma and
inductively coupled plasma atomic emission spectrometry (Performance-based test methodology)
ISO/FDIS 18487-1:2025(Een)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminologicalterminology databases for use in standardization at the following
addresses:
— — IEC Electropedia: available at
— — ISO Online browsing platform: available at https://www.iso.org/obp
— 3.1IEC Electropedia: available at https://www.electropedia.org/
3.1
outside diameter
d
distance between any two points at 180° to each other around the outside of a single section across the tube
Key
d outside diameter
d inside diameter
t wall thickness
ISO/FDIS 18487-1:2025(Een)
Figure 1 — Outside diameter, inside diameter and wall thickness
3.2 3.2
inside diameter
d
distance between any two points at 180° to each other around the inside of a single section across the tube
3.3 3.3
wall thickness
t
thickness measured at a right angle across the tube wall
4 Dimensions
Unless otherwise specified by the purchaser, dimensions shall conform to ISO 8575:20162024, Table 2 that is
relevant to Pressure Class J.
5 Tolerances
Unless otherwise specified by the purchaser, dimensional tolerances shall conform to ISO 12573.
6 Technical requirements
6.1 General
Except as otherwise mentioned in 6.2 to 6.13below,, testing to establish complianceconformity with all of the
technical requirements belowin this clause shall be conducted on a single sample per batch of tubes.
6.2 Composition
Chemical composition shall conform to the percentages by weight given mass fractions (in per cent) given in
Table 1Table 1. Suitable methods of determination of composition are also given in Table 1Table 1. Other
analytical methods may be used by agreement with the purchaser.
Table 1 — Chemical composition
Values in percentagesper cent
Others
Element Al V Fe O N H C Y Ti
2 2 2
...
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