ISO 9156:1998
(Main)Aerospace — Nuts, anchor, self-locking, fixed, 90 degrees corner, reduced series, with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/315 degrees C and 1 100 MPa (at ambient temperature)/425 degrees C — Dimensions
Aerospace — Nuts, anchor, self-locking, fixed, 90 degrees corner, reduced series, with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/315 degrees C and 1 100 MPa (at ambient temperature)/425 degrees C — Dimensions
This International Standard specifies the dimensions of self-locking, fixed, 90° corner anchor nuts, reduced series, with counterbore, with MJ threads, of classifications: 1 100 MPa 1)/235 °C 2), 1 100 MPa 1)/315 °C 2) and 1 100 MPa 1)/425 °C 2). This International Standard is only applicable for the compilation of aerospace product standards.
Aéronautique et espace — Écrous à river, à freinage interne, fixes, d'angle 90 degrés, série réduite, avec chambrage, à filetage MJ, classifications: 1 100 MPa (à température ambiante )/235 degrés C, 1 100 MPa (à température ambiante) /315 degrés C et 1 100 MPa (à température ambiante )/425 degrés C — Dimensions
La présente Norme internationale spécifie les dimensions des écrous à river, à freinage interne, fixes, d'angle 90°, série réduite, avec chambrage, à filetage MJ, de classifications: 1 100 MPa1)/235 °C2), 1 100 MPa1)/315 °C2) et 1 100 MPa1)/425 °C2). La présente Norme internationale est applicable uniquement à l'élaboration de normes de produit destinées aux constructions aérospatiales.
General Information
- Status
- Published
- Publication Date
- 25-Nov-1998
- 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
- 12-Feb-2026
Relations
- Effective Date
- 15-Apr-2008
Overview
ISO 9156:1998 is an international standard developed by the International Organization for Standardization (ISO) that specifies the dimensions of aerospace-grade anchor nuts. These nuts are self-locking, fixed at a 90-degree corner, part of a reduced series, feature a counterbore, and utilize MJ threads. The standard covers nuts classified by tensile strength of 1,100 MPa at ambient temperature with maximum operating temperatures of 235 °C, 315 °C, and 425 °C. ISO 9156:1998 is integral for manufacturing consistency in aerospace fastener systems and ensures compatibility with related aerospace product standards.
Key Topics
- Product Scope: Defines the precise dimensions of self-locking fixed anchor nuts designed specifically for aerospace applications, focusing on corner positioning and reduced series sizes.
- Material Strength Classifications: Nuts are rated to withstand a minimum tensile stress of 1,100 MPa at ambient temperature without failure when tested with higher strength bolts.
- Temperature Ratings: These nuts maintain structural integrity up to specific temperatures-235 °C, 315 °C, and 425 °C-considering the effects of elevated heat exposure after cooling.
- Threading Specification: Uses MJ thread profiles per the aerospace industry to ensure secure fastening and compatibility with aerospace bolts.
- Dimensional Tolerances: Includes strict dimensional and form tolerance requirements, referencing ISO 5855-2, ISO 5858, and ISO 8788 for thread limits, procurement conditions, and positional tolerances.
- Surface and Coating Considerations: Dimensions apply post surface coating but prior to lubrication, with allowances for tooling marks and form tolerances.
- Metallic Cap Attachment: An optional metallic cap must remain secure at maximum operating temperatures, with attachment methods left to the user per ISO 5858 testing procedures.
Applications
ISO 9156:1998 is specially tailored for aerospace manufacturing and engineering where safety, precision, and durability of fasteners are critical. Key practical applications include:
- Aerospace Fastening Systems: Ensuring reliable attachment points in aircraft and spacecraft structural assemblies.
- Aerospace Maintenance and Repair: Guiding replacement and inspection criteria for self-locking anchor nuts within tight dimensional requirements.
- Aerospace Product Standard Development: Serving as a reference for compiling aerospace product standards in procurement and manufacturing documentation.
- High-Temperature Aerospace Environments: Suitable for components exposed to elevated operating temperatures without compromising mechanical integrity.
- Quality Control in Component Production: Providing specific dimensional and tolerance parameters for manufacturers and suppliers.
Related Standards
ISO 9156:1998 is aligned and referenced alongside several key aerospace fastener standards, including:
- ISO 5855-2:1988 – Aerospace MJ Threads – defining thread dimensions and limits for bolts and nuts.
- ISO 5858:1991 – Aerospace Self-Locking Nuts – procurement specifications for nuts operating at temperatures up to 425 °C.
- ISO 8788:1987 – Aerospace Fasteners – tolerances of form and position specific to nuts, ensuring geometric consistency.
Together, these standards create a comprehensive framework supporting the production, testing, and application of critical aerospace fastener components.
Keywords: aerospace fasteners, self-locking anchor nuts, MJ threads, aerospace nuts dimensions, ISO 9156, aerospace standards, high temperature nuts, reduced series anchor nuts, aerospace manufacturing, fastener classification, aerospace product standards.
ISO 9156:1998 - Aerospace -- Nuts, anchor, self-locking, fixed, 90 degrees corner, reduced series, with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/315 degrees C and 1 100 MPa (at ambient temperature)/425 degrees C -- Dimensions
ISO 9156:1998 - Aéronautique et espace -- Écrous a river, a freinage interne, fixes, d'angle 90 degrés, série réduite, avec chambrage, a filetage MJ, classifications: 1 100 MPa (a température ambiante )/235 degrés C, 1 100 MPa (a température ambiante) /315 degrés C et 1 100 MPa (a température ambiante )/425 degrés C -- Dimensions
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Frequently Asked Questions
ISO 9156:1998 is a standard published by the International Organization for Standardization (ISO). Its full title is "Aerospace — Nuts, anchor, self-locking, fixed, 90 degrees corner, reduced series, with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/315 degrees C and 1 100 MPa (at ambient temperature)/425 degrees C — Dimensions". This standard covers: This International Standard specifies the dimensions of self-locking, fixed, 90° corner anchor nuts, reduced series, with counterbore, with MJ threads, of classifications: 1 100 MPa 1)/235 °C 2), 1 100 MPa 1)/315 °C 2) and 1 100 MPa 1)/425 °C 2). This International Standard is only applicable for the compilation of aerospace product standards.
This International Standard specifies the dimensions of self-locking, fixed, 90° corner anchor nuts, reduced series, with counterbore, with MJ threads, of classifications: 1 100 MPa 1)/235 °C 2), 1 100 MPa 1)/315 °C 2) and 1 100 MPa 1)/425 °C 2). This International Standard is only applicable for the compilation of aerospace product standards.
ISO 9156:1998 is classified under the following ICS (International Classification for Standards) categories: 49.030.30 - Nuts. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 9156:1998 has the following relationships with other standards: It is inter standard links to ISO 9156:1989. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 9156:1998 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 9156
Second edition
1998-11-15
Aerospace — Nuts, anchor, self-locking,
fixed, 90° corner, reduced series, with
counterbore, with MJ threads,
classifications: 1 100 MPa (at ambient
temperature)/235 °C, 1 100 MPa (at ambient
temperature)/315 °C and 1 100 MPa (at
ambient temperature)/425 °C — Dimensions
Aéronautique et espace — Écrous à river, à freinage interne, fixes,
d’angle 90°, série réduite, avec chambrage, à filetage MJ, classifications:
1 100 MPa (à température ambiante)/235 °C, 1 100 MPa (à température
ambiante)/315 °C et 1 100 MPa (à température ambiante)/425 °C —
Dimensions
A
Reference number
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.
International Standards are drafted in accordance with the rules given in
the ISO/IEC Directives, Part 3.
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 9156 was prepared by Technical Committee
ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace
fastener systems.
This second edition cancels and replaces the first edition (ISO 9156:1989),
which has been technically revised.
© ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii
©
ISO ISO 9156:1998(E)
Introduction
The dimensions specified in this International Standard have been
determined to allow production of a part which will satisfy the requirements
of the procurement specification ISO 5858.
iii
©
INTERNATIONAL STANDARD ISO ISO 9156:1998(E)
Aerospace — Nuts, anchor, self-locking, fixed, 90° corner, reduced
series, with counterbore, with MJ threads, classifications:
1 100 MPa (at ambient temperature)/235 °C, 1 100 MPa (at ambient
temperature)/315 °C and 1 100 MPa (at ambient
temperature)/425 °C — Dimensions
1 Scope
This International Standard specifies the dimensions of self-locking, fixed, 90° corner anchor nuts, reduced series,
1) 2) 1) 2)
with counterbore, with MJ threads, of classifications: 1 100 MPa /235 °C , 1 100 MPa /315 °C and
1) 2)
1 100 MPa /
...
NORME ISO
INTERNATIONALE 9156
Deuxième édition
1998-11-15
Aéronautique et espace — Écrous à river,
à freinage interne, fixes, d’angle 90°, série
réduite, avec chambrage, à filetage MJ,
classifications: 1 100 MPa (à température
ambiante)/235 °C, 1 100 MPa (à température
ambiante)/315 °C et 1 100 MPa
(à température ambiante)/425 °C —
Dimensions
Aerospace — Nuts, anchor, self-locking, fixed, 90° corner, reduced series,
with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient
temperature)/235 °C, 1 100 MPa (at ambient temperature)/315 °C and
1 100 MPa (at ambient temperature)/425 °C — Dimensions
A
Numéro de référence
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération
mondiale d'organismes nationaux de normalisation (comités membres de
l'ISO). L'élaboration des Normes internationales est en général confiée aux
comités techniques de l'ISO. Chaque comité membre intéressé par une
étude a le droit de faire partie du comité technique créé à cet effet. Les
organisations internationales, gouvernementales et non gouvernementales,
en liaison avec l'ISO participent également aux travaux. L'ISO collabore
étroitement avec la Commission électrotechnique internationale (CEI) en
ce qui concerne la normalisation électrotechnique.
Les Normes internationales sont rédigées conformément aux règles
données dans les Directives ISO/CEI, Partie 3.
Les projets de Normes internationales adoptés par les comités techniques
sont soumis aux comités membres pour vote. Leur publication comme
Normes internationales requiert l'approbation de 75 % au moins des
comités membres votants.
La Norme internationale ISO 9156 a été élaborée par le comité technique
ISO/TC 20, Aéronautique et espace, sous-comité SC 4, Éléments de
fixation pour constructions aérospatiales.
Cette deuxième édition annule et remplace la première (ISO 9156:1989),
dont elle constitue une révision technique.
© ISO 1998
Droits de reproduction réservés. Sauf prescription différente, aucune partie de cette publi-
cation ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun pro-
cédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord
écrit de l'éditeur.
Organisation internationale de normalisation
Case postale 56 • CH-1211 Genève 20 • Suisse
Internet iso@iso.ch
Imprimé en Suisse
ii
©
ISO ISO 9156:1998(F)
Introduction
Les dimensions spécifiées dans la présente Norme internationale ont été
définies pour permettre la production d'une pièce satisfaisant aux exigences de
la spécification d'approvisionnement ISO 5858.
iii
©
NORME INTERNATIONALE ISO ISO 9156:1998(F)
Aéronautique et espace — Écrous à river, à freinage interne, fixes,
d’angle 90°, série réduite, avec chambrage, à filetage MJ,
classifications: 1 100 MPa (à température ambiante)/235 °C,
1 100 MPa (à température ambiante)/315 °C et 1 100 MPa
(à température ambiante)/425 °C — Dimensions
1 Domaine d'application
La présente Norme internationale spécifie les dimensions des écrous à river, à freinage interne, fixes, d’angle 90°,
1) 2) 1) 2)
série réduite, avec chambrage, à filetage MJ, de classifications: 1 100 MPa /235 °C , 1 100 MPa /315 °C et
1) 2)
1 100 MPa /425 °C .
La présente Norme internationale est applicable uniquement à l'élaboration de normes de produit dest
...
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