prEN ISO 7040
(Main)Fasteners - Prevailing torque hexagon nuts - Regular nuts (with non-metallic insert) (ISO/DIS 7040:2024)
Fasteners - Prevailing torque hexagon nuts - Regular nuts (with non-metallic insert) (ISO/DIS 7040:2024)
ISO 7040:2012 specifies the characteristics of prevailing torque type hexagon regular nuts (with non-metallic insert) with threads from M3 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 and 10.
Verbindungselemente - Sechskantmuttern mit Klemmteil - Normalhohe Muttern (mit nichtmetallischem Einsatz) (ISO/DIS 7040:2024)
Fixations - Écrous hexagonaux autofreinés - Écrous normaux (à anneau non métallique) (ISO/DIS 7040:2024)
L'ISO 7040:2012 spécifie les caractéristiques des écrous hexagonaux normaux autofreinés (à anneau non métallique), de diamètres de filetage M3 à M36 inclus, de grade A pour les filetages jusqu'à M16 inclus et de grade B pour les filetages supérieurs à M16, et de classes de qualité 5, 8 et 10.
Vezni elementi - Šestrobe zaščitne matice - Navadni matice (s plastičnim vložkom) (ISO/DIS 7040:2024)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2024
Nadomešča:
SIST EN ISO 7040:2013
Vezni elementi - Šestrobe zaščitne matice - Navadni matice (s plastičnim vložkom)
(ISO/DIS 7040:2024)
Fasteners - Prevailing torque hexagon nuts - Regular nuts (with non-metallic insert)
(ISO/DIS 7040:2024)
Verbindungselemente - Sechskantmuttern mit Klemmteil - Normalhohe Muttern (mit
nichtmetallischem Einsatz) (ISO/DIS 7040:2024)
Fixations - Écrous hexagonaux autofreinés - Écrous normaux (à anneau non métallique)
(ISO/DIS 7040:2024)
Ta slovenski standard je istoveten z: prEN ISO 7040
ICS:
21.060.20 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 7040
ISO/TC 2/SC 12
Fasteners — Prevailing torque
Secretariat: DIN
hexagon nuts — Regular nuts (with
Voting begins on:
non-metallic insert)
2024-06-05
Fixations — Écrous hexagonaux autofreinés — Écrous normaux
Voting terminates on:
(à anneau non métallique)
2024-08-28
ICS: 21.060.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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 SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 7040:2024(en)
DRAFT
ISO/DIS 7040:2024(en)
International
Standard
ISO/DIS 7040
ISO/TC 2/SC 12
Fasteners — Prevailing torque
Secretariat: DIN
hexagon nuts — Regular nuts (with
Voting begins on:
non-metallic insert)
Fixations — Écrous hexagonaux autofreinés — Écrous normaux
Voting terminates on:
(à anneau non métallique)
ICS: 21.060.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: +41 22 749 01 11
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 7040:2024(en)
ii
ISO/DIS 7040:2024(en)
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 .5
7 Designation . 5
Annex A (normative) Regular nuts in steel and stainless steel with D < M5 designed in
accordance with style 1 . 6
Bibliography . 9
iii
ISO/DIS 7040:2024(en)
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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
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.
This fourth edition cancels and replaces the third edition (ISO 7040:2012) which has been technically
revised.
The main changes are as follows:
— the design principles of these nuts have been clarified in scope (see Note);
— for nuts with D < M5, appropriate nut design in accordance with ISO/TR 16224, style 1, has been added
in Annex A (historical nuts not conforming to ISO 898-2 because of their heigth m less than 0,8D have
min
been deleted);
— 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 sizes D ≤ M5 has been changed from s – IT16 to s – IT15 in order to have a larger bearing
w,min min min
surface area and thus less contact pressure;
— h for M5 and M20 has been increased so that regular, high and thin nuts have an identical room for the
max
prevailing torque feature (h – m ) to accommodate the non-metallic insert; h has therefore been
max min min
increased in accordance with the specified tolerance (see Tables 1 and 2);
— 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
DRAFT International Standard ISO/DIS 7040:2024(en)
Fasteners — Prevailing torque hexagon nuts — Regular nuts
(with non-metallic insert)
1 Scope
This document specifies the characteristics of prevailing torque hexagon regular nuts (with non-metallic
insert), in steel and stainless steel, with metric coarse pitch thread M3 to M39, and with product grades A and B.
NOTE 1 These nuts are designed with an overall height equal to m (as specified in ISO 898-2 and ISO 4032
min
for style 1) plus the prevailing torque feature. The height of the prevailing torque feature (h – m ) for the non-
max min
metallic insert is identical for regular, high and thin nuts for a given diameter.
Nuts with sizes D < M5 and design principles in accordance with style 1 are specified in Annex A.
If in certain cases other specifications are requested, property classes and stainless steel grades can be
selected from ISO 898-2 or ISO 3506-2.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 225, Fasteners — Bolts, screws, studs and nuts — Symbols and descriptions of dimensions
ISO 898-2, Fasteners — Mechanical properties of fasteners made of carbon steel and alloy steel — Part 2: Nuts
with specified property classes
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
ISO 3269, Fasteners — Acceptance inspection
ISO 3506-2, Fasteners — Mechanical properties of corrosion-resistant stainless steel fasteners — Part 2: Nuts
with specified grades and property classes
ISO 4042, Fasteners — Electroplated coating systems
ISO 4759-1, Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C
ISO 6157-2, Fasteners — Surface discontinuities — Part 2: Nuts
ISO 8991, Designation system for fasteners
ISO 8992, Fasteners — General requirements for bolts, screws, studs and nuts
ISO 10683, Fasteners — Non-electrolytically applied zinc flake coating systems
3 Terms and definitions
No terms and definitions are listed in this document.
ISO/DIS 7040:2024(en)
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Dimensions
Dimensions for nuts with sizes M5 to M39 shall be in accordance with Figure 1 and with Tables 1 and 2.
Dimensions for nuts with sizes D < M5 shall be in accordance with Annex A.
Symbols and descriptions of dimensions are specified in ISO 225.
a
Prevailing torque feature: shape at the discretion of the manufacturer within the external limits of ∅ s.
b
These nuts are manufactured without washer-face, unless specifically agreed at the time of the order.
Figure 1 — Prevailing torque regular nuts (with non-metallic insert)
Table 1 — Dimensions for nuts M5 to M16 (product grade A)
Dimensions in millimetres
Thread, D M5 M6 (M7) M8 M10 M12 (M14) M16
a
P 0,8 1 1 1,25 1,5 1,75 2 2
max. 5,75 6,75 7,75 8,75 10,80 12,96 15,12 17,28
d
a
min. 5,00 6,00 7,00 8,00 10,00 12,00 14,00 16,00
d min. 7,20 8,88 9,63 11,63 14,63 16,63 19,64 22,49
w
e min. 8,79 11,05 12,12 14,38 17,77 20,03 23,36 26,75
nom. = max. 6,95 8,00 9,20 9,50 11,90 14,90 17,00 19,10
b
h
min. 6,37 7,42 8,62 8,92 11,20 14,20 15,90 17,80
m min. 4,40 4,90 6,14 6,44 8,04 10,37 12,10 14,10
NOTE Sizes shown in brackets are non-preferred.
a
P is the pitch of the thread.
b
The following tolerances apply: h15 for D ≤ M12 and h16 for M12 < D ≤ M18.
ISO/DIS 7040:2024(en)
TTabablele 1 1 ((ccoonnttiinnueuedd))
Thread, D M5 M6 (M7) M8 M10 M12 (M14) M16
m min. 3,52 3,92 4,91 5,15 6,43 8,30 9,68 11,28
w
nom. = max. 8,00 10
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.