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STANDARD 7320
Second edition
1992-12-15
Aerospace - Couplings, threaded and
sealed, for fluid Systems - Dimensions
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Mronautique et espace - Raccordement filetb 6tanche pour /es
systemes de fluides - Dimensions
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Reference number
ISO 7320: 1992(E)
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ISO 7320:1992(E)
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. Esch 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.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 7320 was prepared by Technical Committee
lSO/rC 20, Aircraft and space vehicles, Sub-Committee SC 10, Aerospace
fluid s ystems and componen ts.
This second edition cancels and replaces the first edition
(ISO 7320:1985), which has been technically revised.
Annex A of this International Standard is for information only.
0 ISO 1992
All rights reserved. No part of this publication may be reproduced or utilized in any form or
by any means, electronie or mechanical, including photocopying and microfilm, without per-
mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-l 211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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INTERNATIONAL STANDARD ISO 7320: 1992(E)
- Couplings, threaded and sealed, for fluid
Aerospace
Systems -
Dimensions
ISO 58553:1988, Aerospace - MJ threads -
1 Scope
Part 3: Limit dimensions for fittings for fluid
sys tems.
This International Standard establishes a System for
sealing the port connection of couplings used in the
aerospace industry.
It specifies dimensions to achieve interchangeability 3 Sealing principle and assembly of the
of the port connection, the fitting end and a Seal. The
coupling
seal may be a Standard O-ring or a special ring.
The coupling comprises three elements:
2 Normative reference
a) the port el ement, incl uding the internal thread (see
.
The following Standard contains provisions which, .
4 1) I
through reference in this text, constitute provisions
of this International Standard. At the time of publi- including an external thread
b) the fitting element,
cation, the edition indicated was valid. All Standards
and a groove intended to receive the O-ring (see
are subject to revision, and Parties to agreements 4.2) or a special Seal; this element is screwed into
based on this International Standard are encouraged
the internal threaded element;
to investigate the possibility of applying the most re-
cent edition of the Standard indicated below. Mem- c) the seal element, which maintains System press-
bers of IEC and ISO maintain registers of currently
ure without leakage [a Standard O-ring (sec 4.3)
valid International Standards.
or special Seal].
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ISO 7320:1992(E)
4 Dimensions
4.1 Port connection
See figure 1 and table 1.
Dimensions in millimetres
Surface roughness values in micrometres
Remove burrs 0,l to 0,4, unless otherwise specified
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Break edge 0,15 max.
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