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SLOVENSKI STANDARD
01-marec-2023
Nadomešča:
SIST EN ISO 14581:2014
Vezni elementi - Notranji šestrogeljnik v ugrezni ploski glavi vijaka (običajna oblika
glave) z manjšo obremenljivostjo (ISO 14581:2022)
Fasteners - Hexalobular socket countersunk flat head screws (common head style) with
reduced loadability (ISO 14581:2022)
Verbindungselemente - Senkschrauben mit Innensechsrund (Einheitskopf) mit
reduzierter Belastbarkeit (ISO 14581:2022)
Fixations - Vis à tête fraisée (tête commune) à six lobes internes à capacité de charge
réduite (ISO 14581:2022)
Ta slovenski standard je istoveten z: EN ISO 14581:2023
ICS:
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 14581
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2023
EUROPÄISCHE NORM
ICS 21.060.10 Supersedes EN ISO 14581:2013
English Version
Fasteners - Hexalobular socket countersunk flat head
screws (common head style) with reduced loadability (ISO
14581:2022)
Fixations - Vis à tête fraisée (tête commune) à six lobes Verbindungselemente - Senkschrauben mit
internes à capacité de charge réduite (ISO 14581:2022) Innensechsrund (Einheitskopf) mit reduzierter
Belastbarkeit (ISO 14581:2022)
This European Standard was approved by CEN on 26 November 2022.
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 14581:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 14581:2023) 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 July 2023, and conflicting national standards shall be
withdrawn at the latest by July 2023.
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 14581:2013.
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 14581:2022 has been approved by CEN as EN ISO 14581:2023 without any modification.
INTERNATIONAL ISO
STANDARD 14581
Second edition
2022-12
Fasteners — Hexalobular socket
countersunk flat head screws
(common head style) with reduced
loadability
Fixations — Vis à tête fraisée (tête commune) à six lobes internes à
capacité de charge réduite
Reference number
ISO 14581:2022(E)
ISO 14581:2022(E)
© ISO 2022
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: +41 22 749 01 11
Email: [email protected]
Website: www.iso.org
Published in Switzerland
ii
ISO 14581:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Dimensions and gauging of the head .2
4.1 Dimensions . 2
4.2 Gauging of head . 7
5 Requirements and reference International Standards . 7
6 Marking and labelling . 8
6.1 Marking on product . . 8
6.2 Labelling on package . 8
7 Designation . 9
Annex A (informative) Minimum ultimate tensile loads for screws M2 and M2,5 with full
loadability .10
Bibliography .11
iii
ISO 14581:2022(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 11,
Fasteners with metric external 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 second edition cancels and replaces the first edition (ISO 14581:2013), which has been technically
revised.
The main changes are as follows:
— the whole standard (including title) has been improved to clearly point out that these hexalobular
socket countersunk flat head screws with common head style have reduced loadability because of
their head design (head dimensions and penetration of the hexalobular socket);
— for M2 to M4, partially threaded screws without underhead reinforcement (formerly designated as
“shoulder”) and normative reference to ISO 3508 for x (see figure footnote e) have been added
max
(see Figure 1 b);
— for M5 to M10, underhead reinforcement has been modified from a radius to a conical shape as
adjustment to manufacturing conditions and normative reference to ISO 3508 for x (see figure
max
footnote e) has been added (see Figure 2 b);
— detailed head configuration has been added (see Figure 3);
— shank diameter d has been added in Table 1;
s
— minimum head height k has been added as reference dimension in Table 1;
min
— radius r has been specified for all head configurations (see Figures 1 and 2), and r has been added
min
in Table 1;
— shortest standard lengths l have been increased in Table 1;
nom
iv
ISO 14581:2022(E)
— calculations for M2 and M2,5 have been added in Table 3 for steel screws; as their minimum
ultimate tensile loads for full loadability are not specified in ISO 898-1 and ISO 3506-1, they have
been calculated with the same formulae accordingly (see Table A.1, Annex A);
— the minimum ultimate tensile loads were recalculated and have been changed to more precise
values for steel screws with property classes 4.8 (M3 and M6), 8.8 (M5), and for stainless steel
screws with property classes 50 (M3, M6 and M8) and 70 (M3, M6, M8 and M10); see Table 3;
— property class 10.9 has been added (see Table 2);
— specifications for labelling have been added as new subclause 6.2;
— reference to ISO 15065 for countersinks has been added.
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 14581:2022(E)
Fasteners — Hexalobular socket countersunk flat head
screws (common head style) with reduced loadability
1 Scope
This document specifies the characteristics of hexalobular socket countersunk flat head screws with
reduced loadability due to head design, in steel and stainless steel, with metric coarse pitch threads M2
to M10, and with product grade A.
If in certain cases other specifications are requested, stainless steel grades can be selected from
ISO 3506-1, and dimensional options from ISO 888 or ISO 4753.
NOTE 1 The reduced loadability (related to the countersunk head dimensions in combination with penetration
of the hexalobular socket specified in this document) implies a limitation of ultimate tensile load shown by a
specific marking (
...