ISO/FDIS 7042

Fasteners — Prevailing torque hexagon nuts — High nuts (all metal)

ISO 7042:2012 specifies the characteristics of prevailing torque type all-metal hexagon high nuts with threads from M5 up to and including M36, in product grade A for threads up to and including M16 and product grade B for threads above M16, and with property classes 5, 8, 10 and 12.

Fixations — Écrous hexagonaux autofreinés — Écrous hauts (tout métal)

L'ISO 7042:2012 spécifie les caractéristiques des écrous hexagonaux hauts autofreinés tout métal, de diamètre de filetage M5 à M 36 inclus, de grade A pour les filetages jusqu'à M16 et de grade B pour les filetages supérieurs à M16, et de classes de qualité 5, 8, 10 et 12.

General Information

• Status: Not Published
• ICS: 21.060.20 - Nuts
• Technical Committee: ISO/TC 2/SC 12 - Fasteners with metric internal thread
• Drafting Committee: ISO/TC 2/SC 12 - Fasteners with metric internal thread
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 24-Mar-2025
• Due Date: 24-Mar-2025
• Completion Date: 24-Mar-2025

Relations

• Consolidates: ISO 4701:2019 - Iron ores and direct reduced iron — Determination of size distribution by sieving
• Effective Date: 17-Dec-2022
• Revises: ISO 7042:2012 - Prevailing torque type all-metal hexagon high nuts — Property classes 5, 8, 10 and 12
• Effective Date: 12-Nov-2022

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/TC 2/SC 12
Fasteners — Prevailing torque
Secretariat: DIN
hexagon nuts — High nuts (all
Voting begins on:
metal)
2025-03-24
Fixations — Écrous hexagonaux autofreinés — Écrous hauts
Voting terminates on:
(tout métal)
2025-05-19
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
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/CEN PARALLEL PROCESSING 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.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 2/SC 12
Fasteners — Prevailing torque
Secretariat: DIN
hexagon nuts — High nuts (all metal)
Voting begins on:
Fixations — Écrous hexagonaux autofreinés — Écrous hauts
(tout métal)
Voting terminates on:
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.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions . 2
5 Requirements and reference International Standards . 3
6 Marking and labelling . 4
6.1 Marking on product . .4
6.2 Labelling on package .4
7 Designation . 4
Bibliography . 6

iii
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners
with metric internal thread, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 185, Fasteners, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 7042:2012) which has been technically
revised.
The main changes are as follows:
— the design principles of these nuts have been clarified in Scope (see Note);
— style, relevant property classes and related quenching and tempering conditions for steel nuts have been
specified in Clause 5 in accordance with ISO 898-2 (see Table 3);
— stainless steel nuts have been added in accordance with ISO 3506-2;
— M7, M18, M22, M27, M33 and M39 have been added;
— d has been specified with two decimal places;
a,max
— d for M5 has been changed from s – IT16 to s – IT15 in order to have a larger bearing surface
w,min min min
area and thus less contact pressure;
— h for M12 has been corrected to 12,30 mm (13,30 mm in the third edition came from a typing error);
max
h for M24 has been increased to 24,00 mm in order to have h ≥ D for the whole diameter range;
max max
— specifications for marking and labelling have been added as Clause 6.
Any feedback or questions on this document should be directed to the user's national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
FINAL DRAFT International Standard ISO/FDIS 7042:2025(en)
Fasteners — Prevailing torque hexagon nuts — High nuts
(all metal)
1 Scope
This document specifies the characteristics of prevailing torque (all metal) hexagon high nuts, in steel and
stainless steel, with metric coarse pitch thread M5 to M39, and with product grades A and B.
NOTE These nuts are designed with an overall heigth h = m (as specified in ISO 898-2 and ISO 4033 for
min min
style 2) plus the prevailing torque feature. h has been established in function of h ; therefore, the tolerance
max min
(h – h ) does not follow the ISO code system for tolerances (IT system). The wrenching height m corresponds
max min
...

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ISO /TC 2/SC 12
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Secretariat: DIN
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Date: 2025-02-25xx .
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Fasteners — Prevailing torque hexagon nuts — High nuts (all metal)
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Fixations — Écrous hexagonaux autofreinés — Écrous hauts (tout métal)
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ISO/DIS FDIS 7042:2024 (E2025(en) Formatted: Font: Bold
Formatted: Font: Bold
Formatted: Font: Bold
Formatted: HeaderCentered, Space After: 0 pt, Tab stops:
Not at 4.67 cm
Formatted: Default Paragraph Font
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
Formatted: Default Paragraph Font
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
Formatted: Indent: Left: 0 cm, Right: 0 cm, Space Before:
at the address below or ISO'sISO’s member body in the country of the requester.
0 pt, No page break before, Adjust space between Latin and
Asian text, Adjust space between Asian text and numbers
ISO Copyright Officecopyright office
CP 56 - 401 • Ch. de Blandonnet 8
CH-12111214 Vernier, Geneva 20 Formatted: zzCopyright address, Indent: Left: 0 cm, First
line: 0 cm, Right: 0 cm, Space After: 0 pt, Adjust space
Phone: + 41 22 749 01 11
between Latin and Asian text, Adjust space between Asian
text and numbers
Fax: + 41 22 749 09 47 Formatted: French (France)
EmailE-mail: [e-mail]
Formatted: French (France)
Website: www.iso.orgwww.iso.org
Formatted: zzCopyright address, Indent: Left: 0 cm, First
line: 0 cm, Right: 0 cm, Space After: 0 pt, Adjust space
Published in Switzerland. between Latin and Asian text, Adjust space between Asian
text and numbers
Formatted: FooterPageRomanNumber
ii © ISO 2024 2025 – All rights reserved
ii
Formatted: Font: 11 pt
Formatted: HeaderCentered, Left, Space After: 0 pt, Line
spacing: single, Tab stops: Not at 0.71 cm
Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Dimensions. 2
5 Requirements and reference International Standards . 4
6 Marking and labelling . 5
6.1 Marking on product . 5
6.2 Labelling on package . 5
7 Designation . 6
Bibliography . 7

Formatted: Font: 10 pt
Formatted: Font: 10 pt
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Formatted: FooterCentered, Left
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pt
© ISO 2025 – All rights reserved
iii
ISO/DIS FDIS 7042:2024 (E2025(en) Formatted: Font: Bold
Formatted: Font: Bold
Formatted: Font: Bold
Foreword Formatted: HeaderCentered, Space After: 0 pt, Tab stops:
Not at 4.67 cm
ISO (the International Organization for Standardization) is a worldwide federation of national standards Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
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 document 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). Formatted: English (United Kingdom)
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for identifying any or all such
patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
with metric internal thread, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 185, Fasteners, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 7042:2012) which has been technically revised. Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
The main changes are as follows:
Formatted: Default Paragraph Font
Formatted: Space After: 12 pt, Adjust space between Latin
— — the design principles of these nuts have been clarified in Scope (see Note);
and Asian text, Adjust space between Asian text and numbers
Formatted: Adjust space between Latin and Asian text,
— — style, relevant property classes and related quenching and tempering conditions for steel nuts have
Adjust space between Asian text and numbers, Tab stops: Not
been specified in Clause 5Clause 5 in accordance with ISO 898-2 (see Table 3);Table 3);
at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm + 3.5 cm + 4.2
cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
— — stainless steel nuts have been added in accordance with ISO 3506-2;
Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
— — M7, M18, M22, M27, M33 and M39 have been added;
Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
— — da,max has been specified with two decimal places;
Formatted: Default Paragraph Font
— — dw,min for M5 has been changed from smin – IT16 to smin – IT15 in order to have a larger bearing surface
Formatted: Default Paragraph Font
area and thus less contact pressure;
— — h for M12 has been corrected to 12,30 mm (13,30 mm in the third edition came from a typing error);
max
hmax for M24 has been increased to 24,00 mm in order to have hmax ≥ D for the whole diameter range;
Formatted: FooterPageRomanNumber
iv © ISO 2024 2025 – All rights reserved
iv
Formatted: Font: 11 pt
Formatted: HeaderCentered, Left, Space After: 0 pt, Line
spacing: single, Tab stops: Not at 0.71 cm
— — specifications for marking and labelling have been added as Clause 6.Clause 6.
Formatted: Adjust space between Latin and Asian text,
Any feedback or questions on this document should be directed to the user's national standards body. A
Adjust space between Asian text and numbers
complete listing of these bodies can be found at www.iso.org/members.html.www.iso.org/members.html.
Commented [eXtyles1]: The URL
https://www.iso.org/members.html has been redirected to
http://www.iso.org/about/members. Please verify the URL.
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© ISO 2025 – All rights reserved
v
FINAL DRAFT International Standard ISO/FDIS 7042:2025(en)
Formatted: Left
Formatted: Main Title 1
Fasteners — Prevailing torque hexagon nuts — High nuts (all metal)
1 Scope Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
This document specifies the characteristics of prevailing torque (all metal) hexagon high nuts, in steel and
stainless steel, with metric coarse pitch thread M5 to M39, and with product grades A and B.
NOTE These nuts are designed with an overall heigth hmin = mmin (as specified in ISO 898-2 and ISO 4033 for style 2)
Formatted: Default Paragraph Font
plus the prevailing torque feature. hmax has been established in function of hmin; therefore, the tolerance (hmax – hmin) does
Formatted: Default Paragraph Font
not follow the ISO code system for tolerances (IT system). The wrenching height mw,min corresponds to the values
Formatted: Default Paragraph Font
specified for style 1.
Formatted: Default Paragraph Font
If in certain cases other specifications are requested, property classes and stainless steel grades can be
Formatted: Default Paragraph Font
selected from ISO 898-2 or ISO 3506-2.
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers, Tab stops: Not
at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm + 3.5 cm + 4.2
2 Normative references
cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
Formatted: Adjust space between Latin and Asian text,
The following documents are referred to in the text in such a way that some or all of their content constitutes
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requirements of this document. For dated references, only the edition cited applies. For undated references,
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the latest edition of the referenced document (including any amendments) applies.
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ISO 225, Fasteners — Bolts, screws, studs and nuts — Symbols and descriptions of dimensions Formatted: Default Paragraph Font
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ISO 898-ISO 225, Fasteners — Bolts, screws, studs and nuts — Symbols and descriptions of dimensions
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ISO 898-2, Fasteners — Mechanical properties of fasteners made of carbon steel and alloy steel — Part 2: Nuts
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with specified property classes
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ISO 965-1, ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic
Formatted: Adjust space between Latin and Asian text,
data Adjust space between Asian text and numbers, Tab stops: Not
at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm + 3.5 cm + 4.2
cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
ISO 1891-4, Fasteners — Vocabulary — Part 4: Control, inspection, delivery, acceptance and quality
Commented [eXtyles2]: ISO 965-1: current stage is 40.60
ISO 2320, Fasteners — Prevailing torque steel nuts — Functional properties
ISO 3269, Fasteners — Acceptance inspection
ISO 3506-ISO 965-1, ISO general purpose metric screw threads — Tolerances — Part 1: Principles and
basic data
ISO 1891-4, Fasteners — Vocabulary — Part 4: Control, inspection, delivery, acceptance and quality
ISO 2320, Fasteners — Prevailing torque steel nuts — Functional properties
Formatted: Default Paragraph Font
Formatted: Default Paragraph Font, Font: Italic
ISO 3269, Fasteners — Acceptance inspection
Formatted: Adjust space between Latin and Asian te
...

PROJET FINAL
Norme
internationale
ISO/TC 2/SC 12
Fixations — Écrous hexagonaux
Secrétariat: DIN
autofreinés — Écrous hauts (tout
Début de vote:
métal)
2025-03-24
Fasteners — Prevailing torque hexagon nuts — High nuts (all
Vote clos le:
metal)
2025-05-19
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
PROJETS DE NORMES
TRAITEMENT PARALLÈLE ISO/CEN
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
NORMES POUVANT
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
Numéro de référence
PROJET FINAL
Norme
internationale
ISO/TC 2/SC 12
Fixations — Écrous hexagonaux
Secrétariat: DIN
autofreinés — Écrous hauts
Début de vote:
(tout métal)
2025-03-24
Fasteners — Prevailing torque hexagon nuts — High nuts (all
Vote clos le:
metal)
2025-05-19
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
DOCUMENT PROTÉGÉ PAR COPYRIGHT
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
© ISO 2025 INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
PROJETS DE NORMES
TRAITEMENT PARALLÈLE ISO/CEN
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
NORMES POUVANT
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: [phone]
E-mail: [e-mail]
Web: www.iso.org
Publié en Suisse Numéro de référence
ii
Sommaire Page
Avant-propos .iv
1 Domaine d'application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Dimensions . 2
5 Exigences et Normes internationales de référence . 3
6 Marquage et étiquetage . 4
6.1 Marquage sur le produit .4
6.2 Étiquetage sur l’emballage .4
7 Désignation . 4
Bibliographie . 6

iii
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 (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document a
été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir
www.iso.org/directives).
L’ISO attire l’attention sur le fait que la mise en application du présent document peut entraîner l’utilisation
d’un ou de plusieurs brevets. L’ISO ne prend pas position quant à la preuve, à la validité et à l’applicabilité de
tout droit de propriété revendiqué à cet égard. À la date de publication du présent document, l’ISO n'avait pas
reçu notification qu’un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois,
il y a lieu d’avertir les responsables de la mise en application du présent document que des informations
plus récentes sont susceptibles de figurer dans la base de données de brevets, disponible à l'adresse
www.iso.org/brevets. L’ISO ne saurait être tenue pour responsable de ne pas avoir identifié tout ou partie de
tels droits de propriété.
Les appellations commerciales éventuellement mentionnées dans le présent document sont données pour
information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion de
l'ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles techniques au
commerce (OTC), voir www.iso.org/avant-propos.
Le présent document a été élaboré par le comité technique ISO/TC 2, Fixations, sous-comité SC 12, Fixations
à filetage métrique intérieur, en collaboration avec le comité technique CEN/TC 185, Fixations, du Comité
européen de normalisation (CEN) conformément à l’Accord de coopération technique entre l’ISO et le CEN
(Accord de Vienne).
Cette quatrième édition annule et remplace la troisième édition (ISO 7042:2012) qui a fait l’objet d’une
révision technique.
Les principales modifications sont les suivantes:
— les principes de conception de ces écrous ont été précisés dans le domaine d’application (voir la Note);
— pour les écrous en acier, le style, les classes de qualité appropriées ainsi que le fait que les écrous soient
ou non dans l’état trempé et revenu ont été spécifiés dans l’Article 5 conformément à l’ISO 898-2 (voir
Tableau 3);
— les écrous en acier inoxydable ont été ajoutés conformément à l’ISO 3506-2;
— M7, M18, M22, M27, M33 et M39 ont été ajoutés;
— d a été spécifié avec deux décimales;
a,max
— d pour M5 a été modifié de s – IT16 à s – IT15 afin d’avoir une plus grande surface d’appui et
w,min min min
ainsi une pression de contact moins importante;
— pour le diamètre M12, h a été corrigée en 12,30 mm (13,30 mm dans la troisième édition provenait
max
d'une faute de frappe); pour le diamètre M24 h a été augmentée à 24,00 mm afin d'avoir h ≥ D pour
max max
toute la gamme de diamètres;
iv
— les spécifications pour le marquage et l’étiquetage ont été ajoutées à l’Article 6.
Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent
document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes se
trouve à l’adresse www.iso.org/fr/members.html.

v
PROJET FINAL Norme internationale ISO/FDIS 7042:2025(fr)
Fixations — Écrous hexagonaux autofreinés — Écrous hauts
(tout métal)
1 Domaine d'application
Le présent document spécifie les caractéristiques des écrous hauts hexagonaux autofreinés (tout métal), en
acier et en acier inoxydable, à filetage métrique à pas gros M5 à M39, et de grades A et B.
NOTE Ces écrous sont conçus avec une hauteur totale h = m (tel que spécifié dans l'ISO 898-2 et l'ISO 4033
min min
pour le style 2) plus le dispositif d’autofreinage. Les valeurs de h ont été calculées en fonction de h , de ce fait la
max min
tolérance
...