ISO 3168:1998
(Main)Aerospace - Nuts, anchor, self-locking, fixed, single lug, 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, 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, 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, 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, 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
- 13-Dec-2025
Relations
- Effective Date
- 15-Apr-2008
Overview
ISO 3168:1998 specifies the dimensions for aerospace anchor nuts that are self-locking, fixed, single-lug, with counterbore, and with MJ threads. It covers three classification groups defined by tensile capability at ambient temperature (1 100 MPa) combined with maximum operating temperatures of 235 °C, 315 °C and 425 °C. This second-edition International Standard is intended for use in the compilation of aerospace product standards and replaces the 1986 edition.
Key topics and technical requirements
- Dimensional data: Detailed figure(s) and tabulated dimensions (millimetres) for MJ thread sizes (e.g., MJ3–MJ10) are provided for anchor nut configuration and counterbore geometry.
- Threads and limits: Thread definitions and limit dimensions reference ISO 5855-2 (MJ threads).
- Form and position tolerances: Conformance to tolerances of form and position is required per ISO 8788; unspecified form details are at the manufacturer’s option.
- Surface treatment and measurement: Dimensions and tolerances apply after any surface coating(s) but before application of any lubricant. Surface texture limits and tooling mark allowances are noted.
- Self-locking zone: Tolerances in the self-locking area are specified and apply prior to any intentional out-of-round forming.
- Temperature & mechanical classification notes:
- The “1 100 MPa” note corresponds to the minimum tensile stress the nut withstands at ambient temperature when tested with a higher-strength bolt.
- The maximum temperature (235/315/425 °C) denotes the temperature the nut can withstand without permanent alteration after cooling; this is conditioned by surface treatment.
- Optional metallic cap: If used, the metallic cap must remain attached at the maximum operating temperature; related test conditions are given in ISO 5858.
Applications
ISO 3168 is used where consistent, interchangeable aerospace fasteners are needed:
- Aircraft structural assemblies and panels requiring anchored, single-lug self-locking nuts
- High-temperature or elevated-stress applications in engines, pylons, and hot-structure zones
- Procurement specifications, engineering drawings, and manufacturing tooling for aerospace suppliers
Who uses this standard
- Aerospace design and structural engineers
- Fastener manufacturers and heat-treatment/process engineers
- Quality assurance, inspection, and procurement specialists compiling product standards
- Standards committees and technical authors creating aerospace parts catalogs
Related standards
- ISO 5855-2: MJ threads - limit dimensions for bolts and nuts
- ISO 5858: Self-locking nuts - procurement and test conditions (max operating temperature)
- ISO 8788: Tolerances of form and position for nuts
Keywords: ISO 3168, aerospace nuts, anchor nuts, self-locking nuts, MJ threads, aerospace fasteners, dimensions standard.
ISO 3168:1998 - Aerospace -- Nuts, anchor, self-locking, fixed, single lug, 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 3168:1998 - Aéronautique et espace -- Écrous a river, a freinage interne, fixes, simple patte, 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
Frequently Asked Questions
ISO 3168:1998 is a standard published by the International Organization for Standardization (ISO). Its full title is "Aerospace - Nuts, anchor, self-locking, fixed, single lug, 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, 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, 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 3168:1998 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 3168:1998 has the following relationships with other standards: It is inter standard links to ISO 3168:1986. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase ISO 3168:1998 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of ISO standards.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 3168
Second edition
1998-12-01
Aerospace — Nuts, anchor, self-locking,
fixed, single lug, 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, 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 3168 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 3168:1986),
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 3168:1998(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 3168:1998(E)
Aerospace — Nuts, anchor, self-locking, fixed, single lug, with
counterbore, with MJ threads, classifications: 1 100 MPa (at
ambient temperature)/235 �C and 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, with counterbore,
1) 2) 1) 2) 1) 2)
with MJ threads, for classifications 1 100 MPa /235 �C , 1 100 MPa /315 �C and 1 100 MPa /425 �C .
This International Standard is only applicable for the compilation of aerospace product standards.
2 Normative references
The following standards contain provisions whic
...
NORME ISO
INTERNATIONALE 3168
Deuxième édition
1998-12-01
Aéronautique et espace — Écrous à river, à
freinage interne, fixes, simple patte, 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, 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 3168 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 3168:1986),
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 3168:1998(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 3168:1998(F)
Aéronautique et espace — Écrous à river, à freinage interne, fixes,
simple patte, 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)
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
constructions aérospatiales.
2 Références normatives
Les normes suivantes contiennent des dispositions qui, par suite de la référence qui en est faite, constituent des
dis
...
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