ISO 7332:1998

Aerospace - Nuts, anchor, self-locking, floating, two 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, floating, two lug 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, flottants, double 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 spécifie les dimensions des écrous à river, à freinage interne, flottants, double 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: 25-Nov-1998
• 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

• Consolidated By: ISO/TS 14815:2000 - Road transport and traffic telematics - Automatic vehicle and equipment identification - System specifications
• Effective Date: 06-Jun-2022
• Revises: ISO 7332:1983 - Metric fasteners for aerospace construction - Nuts, anchor, self-locking, floating, two-lug, reduced series, with counterbore - Strength classification 1 100 MPa - Maximum operating temperature 235 degrees C
• Effective Date: 15-Apr-2008

Overview

ISO 7332:1998 specifies the dimensions for a family of aerospace anchor nuts: self‑locking, floating, two‑lug, reduced‑series nuts with a counterbore and MJ threads. It covers nuts classified by strength/temperature capability: 1 100 MPa (at ambient temperature) with maximum operating temperatures of 235 °C, 315 °C and 425 °C. The standard is intended for compilation into aerospace product standards and provides the geometric basis for procurement, manufacturing and design documentation.

Key topics and requirements

• Configuration and dimensions: Figures and Table 1 in the standard define the geometry (diameters, widths, counterbore and lug features) and dimensional limits. Dimensions and tolerances are expressed in millimetres.
• Thread specification: MJ thread limits are referenced to ISO 5855‑2, so thread form and limit dimensions conform to that MJ thread standard.
• Self‑locking and floating features: The document applies to self‑locking, floating, two‑lug anchor nuts (reduced series) including details for the counterbore and locking zone.
• Material/temperature classifications: Nuts are classified by the minimum ambient tensile stress capability (1 100 MPa) and by maximum operating temperature (235 °C, 315 °C, 425 °C), where maximum temperature is tied to surface treatment and recovery of properties after cooling.
• Surface condition and measurement: Dimensions apply after any surface coating(s) but before application of lubricant. Form and position tolerances follow ISO 8788.
• Optional metallic cap: If fitted, the metallic cap must remain attached to the nut at its maximum operating temperature (test conditions referenced in ISO 5858).
• Intended use: The dimensions were determined to allow production of parts that satisfy the procurement specification ISO 5858.

Applications

ISO 7332:1998 is directly useful for:

• Aerospace fastener designers creating anchor nut geometry for structural joints
• Manufacturers and tooling engineers producing reduced‑series MJ threaded anchor nuts
• Procurement teams and specification writers compiling aerospace product standards and purchase documents
• Quality and inspection personnel checking dimensional conformity to aerospace requirements
• Certification and maintenance documentation where standardized fastener geometry is required

Who uses this standard

• Aircraft and space vehicle OEMs and suppliers
• Fastener manufacturers and specialty machinists
• Aerospace engineers (design, structural, systems)
• Procurement, QA, and standards committees within the aerospace supply chain

Related standards

• ISO 5855‑2:1988 - Aerospace - MJ threads - Limit dimensions for bolts and nuts
• ISO 5858:1991 - Aerospace - Self‑locking nuts (procurement specification)
• ISO 8788:1987 - Aerospace - Fasteners - Tolerances of form and position for nuts

Keywords: ISO 7332:1998, aerospace nuts, anchor nut, self‑locking nut, MJ threads, two‑lug floating nut, counterbore, dimensions, aerospace fasteners, ISO standards.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 7332
Second edition
1998-11-15
Aerospace — Nuts, anchor, self-locking,
floating, two 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, flottants,
double 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.
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 7332 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 7332:1983),
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 [e-mail]
Printed in Switzerland
ii
©
ISO ISO 7332:1998(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 7332:1998(E)
Aerospace — Nuts, anchor, self-locking, floating, two 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, floating, two lug 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 /425 °C .
This International Standard is only applicable for the compilation of
...

NORME ISO
INTERNATIONALE 7332
Deuxième édition
1998-11-15
Aéronautique et espace — Écrous à river,
à freinage interne, flottants, double 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, floating, two 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 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 7332 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 7332:1983),
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 [e-mail]
Imprimé en Suisse
ii
©
ISO ISO 7332:1998(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 7332:1998(F)
Aéronautique et espace — Écrous à river, à freinage interne,
flottants, double 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 spécifie les dimensions des écrous à river, à freinage interne, flottants, double
1) 2) 1) 2)
patte, série réduite, avec chambrage, à filetage MJ, de classifications: 1 100 MPa /235 °C , 1 100 MPa /315 °C
1) 2)
et 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 documents
...