ISO 3191:1998
(Main)Aerospace — Nuts, anchor, self-locking, fixed, single lug, 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, single lug, 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, single lug anchor nuts, reduced series, with counterbore, with MJ threads, for classifications: 1 100 MPa1)/235 °C2), 1 100 MPa1)/315 °C2) and 1 100 MPa1)/425 °C2). This International Standard is only applicable for the compilation of aerospace product standards.
Aéronautique et espace — Écrous à river, à freinage interne, fixes, simple patte, 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 prescrit les dimensions des écrous à river, à freinage interne, fixes, simple patte, 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
- 02-Dec-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
- 14-Feb-2026
Relations
- Consolidated By
ISO 14589:2000 - Blind rivets — Mechanical testing - Effective Date
- 06-Jun-2022
- Effective Date
- 15-Apr-2008
Overview
ISO 3191:1998 is an internationally recognized standard developed by the International Organization for Standardization (ISO) focused on aerospace hardware. Specifically, the standard defines the dimensions for self-locking, fixed, single lug anchor nuts of reduced series, equipped with counterbores and MJ threads. The classification covers nuts capable of withstanding a minimum tensile stress of 1,100 MPa at ambient temperature, and operational temperatures up to 235°C, 315°C, and 425°C. This specification is foundational in the development and compilation of aerospace product standards, ensuring interoperability and safety in critical fastening applications.
Key Topics
- Self-locking Anchor Nuts: These nuts prevent loosening due to vibration, which is essential in aerospace environments where component integrity is critical.
- Single Lug and Reduced Series: The single lug design simplifies installation in confined aircraft structures, while the reduced series optimizes weight without compromising strength.
- Counterbore and MJ Threads: The presence of a counterbore and usage of metric MJ thread profiles ensures compatibility with standardized aerospace bolts and improved load distribution.
- Classifications by Temperature: ISO 3191:1998 delineates requirements for anchor nuts based on their mechanical strength (1,100 MPa) and their ability to perform reliably at three specified maximum temperatures (235°C, 315°C, and 425°C).
- Dimensional Specification: The standard prescribes all required measurements, tolerances, and form factors, including the application of surface coatings and the maintenance of tolerances post-coating.
Applications
ISO 3191:1998 is vital in the design and production of aircraft and spacecraft fasteners, being used in:
- Aircraft structural assemblies: Anchor nuts specified by this standard are used for creating secure, vibration-resistant joints in airframes and critical sub-assemblies.
- Aerospace system installations: The self-locking and fixed nature of the nuts make them ideal for attaching equipment, brackets, and other components in environments subject to mechanical stress and high temperatures.
- Maintenance and repair: Standardized dimensions allow for straightforward replacement and maintenance, streamlining procurement and enhancing supply chain reliability.
- High-temperature applications: The classification system enables engineers to select suitable hardware based on expected temperature exposure, supporting safety and compliance in high-performance aircraft.
Related Standards
To ensure full compatibility and performance, ISO 3191:1998 references several other essential aerospace fastener standards:
- ISO 5855-2: Aerospace - MJ threads - Part 2: Limit dimensions for bolts and nuts. Defines thread dimensions for compatible hardware.
- ISO 5858: Aerospace - Self-locking nuts with maximum operating temperature ≤ 425°C - Procurement specification. Specifies broader requirements for self-locking nuts.
- ISO 8788: Aerospace - Fasteners - Tolerances of form and position for nuts. Details manufacturing tolerances for form and positioning.
Together, these standards form the backbone of reliable aerospace fastening systems, supporting performance, safety, and global interoperability within the aviation and space industries.
Keywords: ISO 3191:1998, aerospace standard, anchor nuts, self-locking nuts, single lug, MJ threads, high temperature fasteners, reduced series nut, aircraft fastener standard, dimensions for aerospace nuts, aerospace hardware specification.
Buy Documents
ISO 3191:1998 - Aerospace -- Nuts, anchor, self-locking, fixed, single lug, 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 3191:1998 - Aerospace — Nuts, anchor, self-locking, fixed, single lug, 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/3/1998
ISO 3191:1998 - Aéronautique et espace -- Écrous a river, a freinage interne, fixes, simple patte, 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
ISO 3191:1998 - Aéronautique et espace — Écrous à river, à freinage interne, fixes, simple patte, 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/3/1998
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Frequently Asked Questions
ISO 3191:1998 is a standard published by the International Organization for Standardization (ISO). Its full title is "Aerospace — Nuts, anchor, self-locking, fixed, single lug, 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, single lug anchor nuts, reduced series, with counterbore, with MJ threads, for classifications: 1 100 MPa1)/235 °C2), 1 100 MPa1)/315 °C2) and 1 100 MPa1)/425 °C2). This International Standard is only applicable for the compilation of aerospace product standards.
This International Standard specifies the dimensions of self-locking, fixed, single lug anchor nuts, reduced series, with counterbore, with MJ threads, for classifications: 1 100 MPa1)/235 °C2), 1 100 MPa1)/315 °C2) and 1 100 MPa1)/425 °C2). This International Standard is only applicable for the compilation of aerospace product standards.
ISO 3191:1998 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 3191:1998 has the following relationships with other standards: It is inter standard links to ISO 14589:2000, ISO 3191:1985. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 3191:1998 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 3191
Second edition
1998-12-01
Aerospace — Nuts, anchor, self-locking,
fixed, single lug, 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, simple
patte, 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.
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 3191 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 3191:1985),
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 3191:1998(E)
Introduction
The dimensions specified in this International Standard have been
determined to satisfy the requirements of the procurement specification of
ISO 5858.
iii
©
INTERNATIONAL STANDARD ISO ISO 3191:1998(E)
Aerospace — Nuts, anchor, self-locking, fixed, single lug, 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, single lug anchor nuts, reduced series,
1) 2) 1) 2)
with counterbore, with MJ threads, for classifications: 1 100 MPa /235 °C , 1 100 MPa /315 °C and
1)
2)
1 100 MPa /425 °C .
This Intern
...
INTERNATIONAL ISO
STANDARD 3191
Second edition
1998-12-01
Aerospace — Nuts, anchor, self-locking,
fixed, single lug, 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, simple
patte, 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.
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 3191 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 3191:1985),
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 3191:1998(E)
Introduction
The dimensions specified in this International Standard have been
determined to satisfy the requirements of the procurement specification of
ISO 5858.
iii
©
INTERNATIONAL STANDARD ISO ISO 3191:1998(E)
Aerospace — Nuts, anchor, self-locking, fixed, single lug, 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, single lug anchor nuts, reduced series,
1) 2) 1) 2)
with counterbore, with MJ threads, for classifications: 1 100 MPa /235 °C , 1 100 MPa /315 °C and
1)
2)
1 100 MPa /425 °C .
This Intern
...
NORME ISO
INTERNATIONALE 3191
Deuxième édition
1998-12-01
Aéronautique et espace — Écrous à river,
à freinage interne, fixes, simple patte, 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, single lug, 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 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 3191 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 3191:1985),
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 3191:1998(F)
Introduction
Les dimensions prescrites dans la présente Norme internationale ont été
définies pour satisfaire aux exigences de la spécification d'approvisionnement
de l'ISO 5858.
iii
©
NORME INTERNATIONALE ISO ISO 3191:1998(F)
Aéronautique et espace — Écrous à river, à freinage interne, fixes,
simple patte, 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 prescrit les dimensions des écrous à river, à freinage interne, fixes, simple patte,
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 destinées aux
construction
...
NORME ISO
INTERNATIONALE 3191
Deuxième édition
1998-12-01
Aéronautique et espace — Écrous à river,
à freinage interne, fixes, simple patte, 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, single lug, 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 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 3191 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 3191:1985),
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 3191:1998(F)
Introduction
Les dimensions prescrites dans la présente Norme internationale ont été
définies pour satisfaire aux exigences de la spécification d'approvisionnement
de l'ISO 5858.
iii
©
NORME INTERNATIONALE ISO ISO 3191:1998(F)
Aéronautique et espace — Écrous à river, à freinage interne, fixes,
simple patte, 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 prescrit les dimensions des écrous à river, à freinage interne, fixes, simple patte,
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 destinées aux
construction
...
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