ISO 9609:2016

Aerospace - Nuts, hexagonal, plain, reduced height, normal across flats, with MJ threads, classifications: 450 MPa (at ambient temperature) /120 degrees C, 450 MPa (at ambient temperature) /235 degrees C, 600 MPa (at ambient temperature) /425 degrees C, 900 MPa (at ambient temperature) /235 degrees C, 900 MPa (at ambient temperature) /315 degrees C, 900 MPa (at ambient temperature) /650 degrees C, 1 100 MPa (at ambient temperature) /235 degrees C, 1 100 MPa (at ambient temperature) /730 degrees C and 1 250 MPa (at ambient temperature)/600 degrees C - Dimensions

ISO 9609:2016 specifies the dimensions of plain, hexagonal nuts, reduced height, normal across flats, with MJ threads, of classifications: 450 MPa/120 °C, 450 MPa/235 °C, 600 MPa/425 °C, 900 MPa/235 °C, 900 MPa/315 °C, 900 MPa/650 °C, 1 100 MPa/235 °C, 1 100 MPa/730 °C, and 1 250 MPa/600 °C. NOTE 1 450 MPa, 600 MPa, 900 MPa, 1 100 MPa and 1 250 MPa corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class. NOTE 2 120 °C, 235 °C, 425 °C, 315 °C, 650 °C, 730 °C and 600 °C corresponds to the maximum temperature that the nut is able to withstand without permanent alteration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the surface treatment. Nuts provided with holes are intended to be used with lockwire in conformity with ISO 245. ISO 9609:2016 is only applicable for the compilation of aerospace product standards.

Aéronautique et espace — Écrous hexagonaux ordinaires, hauteur réduite, surplats normaux, à filetage MJ, classifications: 450 MPa (à température ambiante)/120 degrés C, 450 MPa (à température ambiante)/235 degrés C, 600 MPa (à température ambiante)/425 degrés C, 900 MPa (à température ambiante)/235 degrés C, 900 MPa (à température ambiante)/315 degrés C, 900 MPa (à température ambiante)/650 degrés C, 1 100 MPa (à température ambiante)/235 degrés C, 1 100 MPa (à température ambiante)/730 degrés C et 1 250 MPa (à température ambiante)/600 degrés C — Dimensions

General Information

• Status: Published
• Publication Date: 17-Feb-2016
• ICS: 49.030.30 - Nuts
• Technical Committee: ISO/TC 20/SC 4 - Aerospace fastener systems
• Drafting Committee: ISO/TC 20/SC 4 - Aerospace fastener systems
• Current Stage: 9093 - International Standard confirmed
• Start Date: 19-Oct-2021
• Completion Date: 13-Dec-2025

Relations

• Revises: ISO 9609:1996 - Aerospace - Nuts, hexagonal, plain, reduced height, normal across flats, with MJ threads, classifications: 450 MPa (at ambient temperature) /120 degrees C, 450 MPa (at ambient temperature) /235 degrees C, 600 MPa (at ambient temperature) /425 degrees C, 900 MPa (at ambient temperature) /235 degrees C, 900 MPa (at ambient temperature) /315 degrees C, 900 MPa (at ambient temperature) /650 degrees C, 1 100 MPa (at ambient temperature) /235 degrees C, 1 100 MPa (at ambient temperature) /730 degrees C and 1 250 MPa (at ambient temperature)/600 degrees C - Dimensions
• Effective Date: 29-Mar-2014

Overview

ISO 9609:2016 defines the dimensions for aerospace hexagonal nuts that are plain, reduced height, and normal across flats with MJ threads. Published by ISO (second edition, 2016), this standard covers nuts of strength/temperature classifications such as 450 MPa/120 °C, 600 MPa/425 °C, 900 MPa/235 °C, 1 100 MPa/730 °C, and others up to 1 250 MPa/600 °C. It is intended for compilation of aerospace product standards and ensures dimensional interchangeability for aerospace fasteners.

Key topics and technical requirements

• Scope and classifications: Specifies nuts with MJ thread codes (MJ4 to MJ24) across multiple tensile-strength and maximum-temperature classifications. NOTE: the MPa values indicate minimum tensile stress at ambient temperature; temperature ratings indicate maximum service temperature without permanent alteration (surface treatment dependent).
• Dimensions and tolerances: Includes configuration drawings (Figure 1) and a dimensional table (Table 1). Dimensions are given in millimetres and apply after any surface coating(s) but before the application of any lubricant.
• Form and position tolerances: Tolerances of form and position shall conform to ISO 8788.
• Thread and lockwire compatibility: Thread details reference ISO 5855‑2 (MJ thread limit dimensions). Nuts with holes are intended for use with lockwire in conformity with ISO 245.
• Optional features and marking: Provision for lockwire holes and marking locations are shown; form of contour within limiting dimensions is left to manufacturer discretion.

Applications and users

ISO 9609:2016 is primarily used by:

• Aerospace fastener manufacturers for tooling, quality control, and production of reduced-height MJ hex nuts.
• Aircraft and spacecraft designers and engineers specifying fasteners in structural and non-structural assemblies.
• Procurement/specification writers compiling aerospace product standards and purchase documents.
• Quality assurance, inspection, and maintenance teams ensuring dimensional conformity and interchangeability. Practical applications include component design, parts procurement, assembly specification, inspection criteria, and certification requirements where reliable, standardized nut dimensions are required.

Related standards

• ISO 245 - Aerospace - Lockwire - Diameters (lockwire hole usage)
• ISO 5855-2 - Aerospace - MJ threads - Limit dimensions for bolts and nuts
• ISO 8788 - Aerospace - Nuts, metric - Tolerances of form and position

Keywords: ISO 9609:2016, aerospace nuts, hexagonal nuts, MJ threads, reduced height nuts, nut dimensions, aerospace fastener standards, tensile stress classifications, lockwire.

Standards Content (Sample)

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 9609
ISO/TC 20/SC 4
Aerospace — Nuts, hexagonal, plain,
Secretariat: DIN
reduced height, normal across flats,
Voting begins on:
2015­11­03 with MJ threads, classifications:
450 MPa (at ambient temperature)
Voting terminates on:
2016­01­03
/120 °C, 450 MPa (at ambient
temperature) /235 °C, 600 MPa (at
ambient temperature) /425 °C, 900
MPa (at ambient temperature) /235
°C, 900 MPa (at ambient temperature)
/315 °C, 900 MPa (at ambient
temperature) /650 °C, 1 100 MPa
(at ambient temperature) /235 °C, 1
100 MPa (at ambient temperature)
/730 °C and 1 250 MPa (at ambient
temperature)/600 °C — Dimensions
Aéronautique et espace — Écrous hexagonaux ordinaires, hauteur
réduite, surplats normaux, à filetage MJ, classifications: 450 MPa
(à température ambiante)/120 °C, 450 MPa (à température
ambiante)/235 °C, 600 MPa (à température ambiante)/425 °C, 900
MPa (à température ambiante)/235 °C, 900 MPa (à température
ambiante)/315 °C, 900 MPa (à température ambiante)/650
°C, 1 100 MPa (à température ambiante)/235 °C, 1 100 MPa (à
température ambiante)/730 °C et 1 250 MPa (à température
ambiante)/600 °C — Dimensions
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
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 9609:2015(E)
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. ISO 2015

ISO/FDIS 9609:2015(E)
© 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
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
Ch. de Blandonnet 8 • CP 401
CH­1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2015 – All rights reserved

ISO/FDIS 9609:2015(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Configuration and dimensions . 1
ISO/FDIS 9609:2015(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. 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 non­governmental, 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 documents 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 drawn to the possibility that some of the elements of this document may be the subject of
patent rights. 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 www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms an
...

INTERNATIONAL ISO
STANDARD 9609
Second edition
2016-02-15
Aerospace — Nuts, hexagonal, plain,
reduced height, normal across flats,
with MJ threads, classifications:
450 MPa (at ambient temperature)
/120 °C, 450 MPa (at ambient
temperature) /235 °C, 600 MPa (at
ambient temperature) /425 °C, 900
MPa (at ambient temperature) /235
°C, 900 MPa (at ambient temperature)
/315 °C, 900 MPa (at ambient
temperature) /650 °C, 1 100 MPa
(at ambient temperature) /235 °C, 1
100 MPa (at ambient temperature)
/730 °C and 1 250 MPa (at ambient
temperature)/600 °C — Dimensions
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2016 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Configuration and dimensions . 1
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 documents 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 drawn to the possibility that some of the elements of this document may be the subject of
patent rights. 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 www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
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 4, Aerospace fastener systems.
This second edition cancels and replaces the first edition (ISO 9609:1996), of which it constitutes a
minor revision.
iv © ISO 2016 – All rights reserved

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