EN ISO 7380-2:2023

SLOVENSKI STANDARD
01-marec-2023
Nadomešča:
SIST EN ISO 7380-2:2011
Vezni elementi - Vijaki s sploščeno polkrožno glavo z manjšo obremenljivostjo - 2.
del: Sploščena polkrožna glava z robom in notranjim šestkotnikom (ISO 7380-
2:2022)
Fasteners - Button head screws with reduced loadability - Part 2: Hexagon socket button
head screws with collar (ISO 7380-2:2022)
Mechanische Verbindungselemente - Schrauben mit abgeflachtem Halbrundkopf mit
reduzierter Belastbarkeit - Teil 2: Schrauben mit abgeflachtem Halbrundkopf mit
Innensechskant und Bund (ISO 7380-2:2022)
Fixations - Vis à tête cylindrique bombée plate à capacité de charge réduite - Partie 2:
Tête cylindrique bombée plate à six pans creux et embase plate (ISO 7380-2:2022)
Ta slovenski standard je istoveten z: EN ISO 7380-2:2023
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 7380-2
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2023
EUROPÄISCHE NORM
ICS 21.060.10 Supersedes EN ISO 7380-2:2011
English Version
Fasteners - Button head screws with reduced loadability -
Part 2: Hexagon socket button head screws with collar
(ISO 7380-2:2022)
Fixations - Vis à tête cylindrique bombée plate à Mechanische Verbindungselemente - Schrauben mit
capacité de charge réduite - Partie 2: Tête cylindrique abgeflachtem Halbrundkopf mit reduzierter
bombée plate à six pans creux et embase plate (ISO Belastbarkeit - Teil 2: Schrauben mit abgeflachtem
7380-2:2022) Halbrundkopf mit Innensechskant und Bund (ISO
7380-2:2022)
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 7380-2:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 7380-2:2023) 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 7380-2:2011.
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 7380-2:2022 has been approved by CEN as EN ISO 7380-2:2023 without any
modification.
INTERNATIONAL ISO
STANDARD 7380-2
Second edition
2022-12
Fasteners — Button head screws with
reduced loadability —
Part 2:
Hexagon socket button head screws
with collar
Fixations — Vis à tête cylindrique bombée plate à capacité de charge
réduite —
Partie 2: Tête cylindrique bombée plate à six pans creux et à embase
plate
Reference number
ISO 7380-2:2022(E)
ISO 7380-2:2022(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: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 7380-2:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definition . 2
4 Dimensions .2
5 Requirements and reference International Standards . 6
6 Marking and labelling . 7
6.1 Marking on product . . 7
6.2 Labelling on package . 7
7 Designation . 7
Bibliography . 8
iii
ISO 7380-2:2022(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 7380-2:2011), 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 hexagon
socket button head screws have reduced loadability because of their head design (head dimensions
and penetration of the hexagon socket);
— the reference thread length b has been increased to 3d for partially threaded screws M16 so that
these screws can be tensile tested in accordance with ISO 3506-1 (b ≥ 3d is required to tensile test
screws with reduced loadability);
— the reference datum for the outer diameter of the bearing face has been specified (see Figure 1),
and the minimum values have been reduced to d = d × 0,9 considering the manufacturing
w,min c,min
aspects for “button head with collar”(see Table 1);
— e values have been rounded to two decimal places (see Table 1);
min
— the maximum depth of the hexagon socket t has been added (see Table 1);
max
— symbol w has been substituted by the new symbol w in order to define the wall thickness between
b
the bottom of the cylindrical broached hole and the bearing face (see Figure 2 and Table 1);
— the definition of r in Figure 1 has been changed to allow the offset of the centre of the radius from
f
the thread axis;
— the smallest and greatest standard lengths have been amended (see Table 2);
iv
ISO 7380-2:2022(E)
— the minimum ultimate tensile loads were recalculated and have been changed to more precise
values for screws with property classes 8.8 (M5, M12 and M16) and 10.9 (M3, M6 and M10), see
Table 4;
— specifications for marking and labelling have been added as new Clause 6.
A list of all parts in the ISO 7380 series can be found on the ISO website.
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 7380-2:2022(E)
Fasteners — Button head screws with reduced
loadability —
Part 2:
Hexagon socket button head screws with collar
1 Scope
This document specifies the characteristics of hexagon socket button head screws with collar, with
reduced loadability due to head design, in steel, with metric coarse pitch threads M3 to M16, and with
product grade A.
If in certain cases other specifications are requested, dimensional options can be selected from ISO 888
or ISO 4753.
NOTE The reduced loadability (related to the head dimensions in combination with penetration of the
hexagon socket specified in this document) implies a limitation of ultimate tensile load shown by a specific
marking (property class preceded by a zero). The loadability in the head is assumed to be 80 % of that in the
thread for all sizes and all property classes, see Table 4.
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 —
...