EN ISO 4032:2023

Fasteners - Hexagon regular nuts (style 1) (ISO 4032:2023)

This document specifies the characteristics of hexagon regular nuts (style 1), in steel and stainless steel, with metric coarse pitch thread M5 to M39, and with product grades A and B.
NOTE            For nuts with sizes D < M5 and D > M39, see 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.

Verbindungselemente - Sechskantmuttern (Typ 1) (ISO 4032:2023)

Dieses Dokument legt die Eigenschaften von Sechskantmuttern (Typ 1) aus Stahl und nichtrostendem Stahl mit metrischen Regelgewinden M5 bis M39 und mit Produktklassen A und B fest.
ANMERKUNG   Für Muttern mit Größen von D < M5 und D > M39 siehe Anhang A.
Falls in bestimmten Fällen andere Festlegungen benötigt werden, können Festigkeitsklassen und Stahlsorten nichtrostender Stähle aus ISO 898 2 oder ISO 3506 2 entnommen werden.

Fixations - Écrous normaux hexagonaux (style 1) (ISO 4032:2023)

Le présent document spécifie les caractéristiques des écrous normaux hexagonaux (style 1), en acier et en acier inoxydable, à filetage métrique à pas gros M5 à M39, et de grades A et B.
NOTE            Pour les écrous de diamètres D < M5 et D > M39, voir l’Annexe A.
Si dans certains cas d’autres spécifications sont requises, les classes de qualité et les grades d’acier inoxydable peuvent être choisis dans l'ISO 898‑2 ou l'ISO 3506‑2.

Vezni elementi - Šestrobe matice (tip 1) (ISO 4032:2023)

Ta dokument določa značilnosti šestrobih matic (tip 1) iz jekla in nerjavnega jekla, z grobim metrskim navojem velikosti od M5 do M39 ter razredoma izdelave A in B.
OPOMBA: Za matice velikosti D < M5 in D > M39 glej dodatek A.
Če se v določenih primerih zahtevajo druge specifikacije, je razrede lastnosti in tipe nerjavnega jekla mogoče izbrati v skladu s standardom ISO 898-2 ali ISO 3506-2.

General Information

• Status: Published
• Publication Date: 29-Aug-2023
• ICS: 21.060.20 - Nuts
• Technical Committee: CEN/TC 185 - Threaded and nonthreaded mechanical fasteners and accessories
• Drafting Committee: CEN/TC 185 - Threaded and nonthreaded mechanical fasteners and accessories
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 30-Aug-2023
• Completion Date: 30-Aug-2023
• Ref Project: SIST EN ISO 4032:2023 - Fasteners - Hexagon regular nuts (style 1) (ISO 4032:2023)

Relations

• Replaces: EN ISO 4032:2012 - Hexagon regular nuts (style 1) - Product grades A and B (ISO 4032:2012)
• Effective Date: 28-Jan-2023

Overview - EN ISO 4032:2023 (Hexagon regular nuts, style 1)

EN ISO 4032:2023 (ISO 4032:2023) specifies the characteristics of hexagon regular nuts (style 1) manufactured in steel and stainless steel, with metric coarse pitch threads from M5 to M39, and with product grades A and B. The standard defines dimensional requirements, tolerances, material and mechanical property references, surface condition options, and marking and labelling rules for these common fasteners.
Note: nuts with sizes D < M5 or D > M39 are addressed informatively in Annex A.

Key topics and technical requirements

• Scope and sizes: Dimensions and tolerances for nuts M5 to M39 (Figures and Tables for product grades A and B). M7 is included as a newly preferred size in this edition.
• Materials & properties: Steel and stainless-steel options; stainless steel grades and property classes are aligned with ISO 3506-2, steel property classes with ISO 898-2. Product grades A (smaller sizes) and B (larger sizes) are defined.
• Threads and tolerances: Metric coarse pitch threads with tolerance class 6H (ISO 965-1). Dimensional symbols follow ISO 225. Tolerances and product grades reference ISO 4759-1.
• Surface condition and coatings: As-processed, electroplated (ISO 4042), zinc-flake (ISO 10683), hot-dip galvanizing (ISO 10684), or other finishes by agreement. Surface discontinuities and integrity per ISO 6157-2.
• Inspection & acceptance: Acceptance inspection requirements reference ISO 3269.
• Marking & labelling: On-product marking and package labelling requirements follow ISO 898-2 (steel) or ISO 3506-2 (stainless steel). Package labelling must reference EN ISO 4032:2023.

Applications and who uses this standard

EN ISO 4032:2023 is essential for:

• Fastener manufacturers - to design, produce and certify hexagon nuts that meet international dimensional and mechanical specifications.
• OEMs and design engineers - to specify compliant hexagon nuts for machinery, automotive, construction and industrial equipment.
• Purchasing & procurement teams - to create unambiguous purchase specifications and ensure interchangeability.
• Quality and testing laboratories - for inspection, acceptance testing and conformity assessment.
• Distributors and maintenance teams - to identify correct nut grades, coatings and suitability for service environments.

Practical benefits include consistent interchangeability, predictable mechanical performance, and clear requirements for coatings, marking and inspection - reducing procurement disputes and improving product reliability.

Related standards (selection)

• ISO 898-2 (mechanical properties - steel nuts)
• ISO 3506-2 (mechanical properties - stainless steel nuts)
• ISO 965-1 (metric thread tolerances)
• ISO 4759-1 (tolerances - product grades)
• ISO 4042, ISO 10683, ISO 10684 (coating systems)
• ISO 3269, ISO 6157-2 (inspection and surface integrity)

Keywords: EN ISO 4032:2023, ISO 4032:2023, hexagon regular nuts, fasteners, metric coarse pitch thread, M5–M39, product grade A, product grade B, nuts standard.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2023
Vezni elementi - Šestrobe matice (tip 1) (ISO 4032:2023)
Fasteners - Hexagon regular nuts (style 1) (ISO 4032:2023)
Mechanische Verbindungselemente - Sechskantmuttern (Typ 1) (ISO 4032:2023)
Fixations - Écrous normaux hexagonaux (style 1) (ISO 4032:2023)
Ta slovenski standard je istoveten z: EN ISO 4032:2023
ICS:
21.060.20 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 4032
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2023
EUROPÄISCHE NORM
ICS 21.060.20 Supersedes EN ISO 4032:2012
English Version
Fasteners - Hexagon regular nuts (style 1) (ISO
4032:2023)
Fixations - Écrous normaux hexagonaux (style 1) (ISO Mechanische Verbindungselemente -
4032:2023) Sechskantmuttern (Typ 1) (ISO 4032:2023)
This European Standard was approved by CEN on 10 June 2023.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4032:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 4032:2023) has been prepared by Technical Committee ISO/TC 2 "Fasteners" in
collaboration with Technical Committee CEN/TC 185 “Fasteners” the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by February 2024, and conflicting national standards
shall be withdrawn at the latest by February 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 4032:2012.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 4032:2023 has been approved by CEN as EN ISO 4032:2023 without any modification.

INTERNATIONAL ISO
STANDARD 4032
Fifth edition
2023-08
Fasteners — Hexagon regular nuts
(style 1)
Fixations — Écrous normaux hexagonaux (style 1)
Reference number
ISO 4032:2023(E)
ISO 4032:2023(E)
© ISO 2023
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, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
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
ii
ISO 4032:2023(E)
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 . 4
6 Marking and labelling . 5
6.1 Marking on product . . 5
6.2 Labelling on package . 5
7 Designation . 5
Annex A (informative) Historical nuts with D < M5 and D > M39, not conforming to
ISO 898-2 nor to ISO 3506-2 . 6
Bibliography . 9
iii
ISO 4032:2023(E)
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, 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 fifth edition cancels and replaces the fourth edition (ISO 4032:2012) which has been technically
revised.
The main changes are as follows:
— nuts with D < M5 and D > M39 (with m < 0,8D not conforming to ISO 898-2 nor to ISO 3506-2)
min
have been shifted to informative Annex A; reference to ISO/TR 16224 for appropriate nut design has
been added;
— M7 has been added;
— values of c for sizes M1,6 to M2,5 have been amended in accordance with ISO 4759-1;
max
— d , d and m have been specified with two decimal places;
a,max w,min w,min
— d for sizes D ≤ M5 has been changed from s – IT16 to s – IT15 in order to have a larger
w,min min min
bearing surface area and thus less contact pressure;
— for steel nuts, quenching and tempering condition has been specified in accordance with ISO 898-2,
and property classes 5 and 12 have been added;
— for stainless steel nuts, grades D4 and D6 and property class 80 have been added;
— non-ferrous metal nuts have been deleted (as a consequence of the withdrawal of ISO 8839);
— specifications for marking and labelling have been added as Clause 6.
iv
ISO 4032:2023(E)
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.
v
INTERNATIONAL STANDARD ISO 4032:2023(E)
Fasteners — Hexagon regular nuts (style 1)
1 Scope
This document specifies the characteristics of hexagon regular nuts (style 1), in steel and stainless
steel, with metric coarse pitch thread M5 to M39, and with product grades A and B.
NOTE For nuts with sizes D < M5 and D > M39, see 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 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, Tolera
...