SIST EN ISO 7380-1:2023

Fasteners - Button head screws with reduced loadability - Part 1: Hexagon socket button head screws (ISO 7380-1:2022)

This document specifies the characteristics of hexagon socket button head screws with reduced loadability due to head design, in steel and stainless steel, with metric coarse pitch threads M3 to M16, and with product grade A.
If, in certain cases, other specifications are requested, stainless steel grades can be selected from ISO 3506-1, and the dimensional options 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.

Mechanische Verbindungselemente - Schrauben mit abgeflachtem Halbrundkopf mit reduzierter Belastbarkeit - Teil 1: Schrauben mit abgeflachtem Halbrundkopf mit Innensechskant (ISO 7380-1:2022)

Dieses Dokument legt die Eigenschaften von Schrauben mit abgeflachtem Halbrundkopf mit Innensechskant mit aufgrund der Auslegung des Kopfes reduzierter Belastbarkeit mit metrischen Regelgewinden M3 bis M16 in Produktklasse A fest.
ANMERKUNG Die reduzierte Belastbarkeit (bezogen auf die Kopfgeometrie in Kombination mit der in diesem Dokument festgelegten Eindringtiefe des Innensechskantes) bringt eine Begrenzung der Mindestbruchkraft mit sich. Es wird angenommen, dass die Belastbarkeit im Kopf 80 % der Belastbarkeit im Gewinde für alle Größen und alle Festigkeitsklassen beträgt, siehe Tabelle 3.
Falls in bestimmten Fällen andere Festlegungen benötigt werden, können Stahlsorten für nichtrostende Stähle aus ISO 3506-1 und Maßangaben aus ISO 888 oder ISO 4753 entnommen werden.

Fixations - Vis à tête cylindrique bombée plate à capacité de charge réduite - Partie 1: Tête cylindrique bombée plate à six pans creux (ISO 7380-1:2022)

Le présent document spécifie les caractéristiques des vis à tête cylindrique bombée plate à six pans creux, à capacité de charge réduite du fait de la conception de la tête, en acier et en acier inoxydable, à filetage métrique à pas gros M3 à M16, et de grade A.
Si dans certains cas d’autres spécifications sont requises, les grades d’acier inoxydable peuvent être choisis dans l'ISO 3506‑1, et les options dimensionnelles dans l'ISO 888 ou l'ISO 4753.
NOTE         La capacité de charge réduite (du fait des dimensions de la tête et de la profondeur de pénétration du six pans creux spécifiées dans le présent document) implique une limitation de la charge de rupture à la traction, indiquée par un marquage spécifique (classe de qualité précédée d’un zéro). La capacité de charge dans la tête est considérée comme égale à 80 % de la résistance du filetage pour toutes les dimensions et pour toutes les classes de qualité, voir Tableau 4.

Vezni elementi - Vijaki s sploščeno polkrožno glavo z manjšo obremenljivostjo - 1. del: Sploščena polkrožna glava z notranjim šestkotnikom (ISO 7380-1:2022)

Ta dokument določa značilnosti vijakov s sploščeno polkrožno glavo z notranjim šestkotnikom z manjšo obremenljivostjo zaradi zasnove glave, v jeklu in nerjavnem jeklu, z grobim metričnim navojem velikosti od M3 do M16, in razredom izdelave A.
Če se v določenih primerih zahtevajo druge specifikacije, je razrede lastnosti nerjavnega jekla mogoče izbrati po standardu ISO 3506-1, dimenzijske možnosti pa po ISO 888 ali ISO 4753.
OPOMBA: Zmanjšana obremenljivost (povezana z dimenzijami glave v kombinaciji s prebojem šestkotnika, navedenega v tem dokumentu) pomeni omejitev končne natezne sile, ki ima posebno oznako (razred lastnosti z ničlo na začetku). Predpostavlja se, da je obremenljivost v glavi 80 % tiste v navoju za vse velikosti in vse razrede lastnosti; glej preglednico 4.

General Information

• Status: Published
• Public Enquiry End Date: 31-Jan-2022
• Publication Date: 23-Jan-2023
• ICS: 21.060.10 - Bolts, screws, studs
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 17-Jan-2023
• Due Date: 24-Mar-2023
• Completion Date: 24-Jan-2023
• Ref Project: EN ISO 7380-1:2023 - Fasteners - Button head screws with reduced loadability - Part 1: Hexagon socket button head screws (ISO 7380-1:2022)

Relations

• Revised: SIST EN ISO 7380-1:2011 - Button head screws - Part 1: Hexagon socket button head screws (ISO 7380-1:2011)
• Effective Date: 19-Jun-2019
• Replaces: SIST EN ISO 7380-1:2011 - Button head screws - Part 1: Hexagon socket button head screws (ISO 7380-1:2011)
• Effective Date: 16-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 7380-1:2023
01-marec-2023
Nadomešča:
SIST EN ISO 7380-1:2011
Vezni elementi - Vijaki s sploščeno polkrožno glavo z manjšo obremenljivostjo - 1.
del: Sploščena polkrožna glava z notranjim šestkotnikom (ISO 7380-1:2022)
Fasteners - Button head screws with reduced loadability - Part 1: Hexagon socket button
head screws (ISO 7380-1:2022)
Mechanische Verbindungselemente - Schrauben mit abgeflachtem Halbrundkopf mit
reduzierter Belastbarkeit - Teil 1: Schrauben mit abgeflachtem Halbrundkopf mit
Innensechskant (ISO 7380-1:2022)
Fixations - Vis à tête cylindrique bombée plate à capacité de charge réduite - Partie 1:
Tête cylindrique bombée plate à six pans creux (ISO 7380-1:2022)
Ta slovenski standard je istoveten z: EN ISO 7380-1:2023
ICS:
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
SIST EN ISO 7380-1:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 7380-1:2023

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SIST EN ISO 7380-1:2023


EN ISO 7380-1
EUROPEAN STANDARD

NORME EUROPÉENNE

January 2023
EUROPÄISCHE NORM
ICS 21.060.10 Supersedes EN ISO 7380-1:2011
English Version

Fasteners - Button head screws with reduced loadability -
Part 1: Hexagon socket button head screws (ISO 7380-
1:2022)
Fixations - Vis à tête cylindrique bombée plate à Mechanische Verbindungselemente - Schrauben mit
capacité de charge réduite - Partie 1: Tête cylindrique abgeflachtem Halbrundkopf mit reduzierter
bombée plate à six pans creux (ISO 7380-1:2022) Belastbarkeit - Teil 1: Schrauben mit abgeflachtem
Halbrundkopf mit Innensechskant (ISO 7380-1:2022)
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 7380-1:2023 E
worldwide for CEN national Members.

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SIST EN ISO 7380-1:2023
EN ISO 7380-1:2023 (E)
Contents Page
European foreword . 3

2

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SIST EN ISO 7380-1:2023
EN ISO 7380-1:2023 (E)
European foreword
This document (EN ISO 7380-1:2023) 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 7380-1:2011.
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 7380-1:2022 has been approved by CEN as EN ISO 7380-1:2023 without any
modification.

3

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SIST EN ISO 7380-1:2023

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SIST EN ISO 7380-1:2023
INTERNATIONAL ISO
STANDARD 7380-1
Second edition
2022-12
Fasteners — Button head screws with
reduced loadability —
Part 1:
Hexagon socket button head screws
Fixations — Vis à tête cylindrique bombée plate à capacité de charge
réduite —
Partie 1: Tête cylindrique bombée plate à six pans creux
Reference number
ISO 7380-1:2022(E)
© ISO 2022

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SIST EN ISO 7380-1:2023
ISO 7380-1:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© 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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2022 – All rights reserved

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SIST EN ISO 7380-1:2023
ISO 7380-1:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 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 . 8
Bibliography . 9
iii
© ISO 2022 – All rights reserved

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SIST EN ISO 7380-1:2023
ISO 7380-1:2022(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 7380-1:2011), 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 × 0,92 considering the manufacturing
w,min k,min
aspects for “button head” (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 2022 – All rights reserved

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SIST EN ISO 7380-1:2023
ISO 7380-1:2022(E)
— stainless steel grades A3 and A5 have been deleted from Table 3;
— the minimum ultimate tensile loads were recalculated and have been changed to more precise
values for steel screws with property classes 8.8 (M5, M12 and M16), 10.9 (M3, M6 and M10) and
12.9/12.9 (M4 to M8) and for stainless steel screws with property classes 70 (M3 to M10 and M16)
and 80 (M5, M12 and M16); 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 standa
...

SLOVENSKI STANDARD
oSIST prEN ISO 7380-1:2022
01-januar-2022
Vezni elementi - Vijaki s sploščeno polkrožno glavo z manjšo obremenljivostjo - 1.
del: Sploščena polkrožna glava z notranjim šestkotnikom (ISO/DIS 7380-1:2021)
Fasteners - Button head screws with reduced loadability - Part 1: Hexagon socket button
head screws (ISO/DIS 7380-1:2021)
Mechanische Verbindungselemente - Schrauben mit abgeflachtem Halbrundkopf mit
reduzierter Belastbarkeit - Teil 1: Schrauben mit abgeflachtem Halbrundkopf mit
Innensechskant (ISO/DIS 7380-1:2021)
Fixations - Vis à tête cylindrique bombée plate à capacité de charge réduite - Partie 1:
Tête cylindrique bombée plate à six pans creux (ISO/DIS 7380-1:2021)
Ta slovenski standard je istoveten z: prEN ISO 7380-1
ICS:
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
oSIST prEN ISO 7380-1:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 7380-1:2022

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oSIST prEN ISO 7380-1:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 7380-1
ISO/TC 2/SC 11 Secretariat: DIN
Voting begins on: Voting terminates on:
2021-11-15 2022-02-07
Fasteners — Button head screws with reduced
loadability —
Part 1:
Hexagon socket button head screws
Partie 1: Tête cylindrique bombée plate à six pans creux
ICS: 21.060.10
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 7380-1:2021(E)
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. © ISO 2021

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oSIST prEN ISO 7380-1:2022
ISO/DIS 7380-1:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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 2021 – All rights reserved

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oSIST prEN ISO 7380-1:2022
ISO/DIS 7380-1:2021(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Dimensions .2
5 Requirements and reference International Standards . 5
6 Marking and labelling . 7
6.1 Marking on product . . 7
6.2 Labelling on package . 7
7 Designation . 8
Bibliography . 9
iii
© ISO 2021 – All rights reserved

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oSIST prEN ISO 7380-1:2022
ISO/DIS 7380-1:2021(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.
This second edition cancels and replaces the first edition (ISO 7380-1:2011), which has been technically
revised.
The main changes compared to the previous edition 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 in accordance
with other relevant product standards (see Figure 1), and the minimum values have been reduced
to d = d × 0,92 considering the manufacturing aspects for “button head” (see Table 1);
w,min k,min
— 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
— the new symbol w has been introduced in Figure 2 and Table 1 instead of the symbol w in order
b
to define the wall thickness between the bottom of the cylindrical hole (broached hole) and the
bearing face.
— 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 rules for the smallest and greatest standardized nominal lengths have been added (see Table 2);
iv
  © ISO 2021 – All rights reserved

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oSIST prEN ISO 7380-1:2022
ISO/DIS 7380-1:2021(E)
— the minimum ultimate tensile loads were recalculated and have been changed to more precise
values for M3 (property classes 10.9 and 70), M4 (property class 70), M5 (property classes 8.8, 70
and 80), M6 (property classes 10.9 and 70), M8 (property class 70), M10 (property classes 10.9 and
70), M12 (property classes 8.8 and 80) and M16 (property classes 8.8, 70 and 80), see Table 4;
— property class 12.9/12.9 has been excluded for the screws with reduced loadability, and stainless
steel grades A3 and A5 have been deleted from default stainless steel grades in Table 3;
— a new Clause 6, Marking and labelling, has been added.
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
© ISO 2021 – All rights reserved

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oSIST prEN ISO 7380-1:2022

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oSIST prEN ISO 7380-1:2022
DRAFT INTERNATIONAL STANDARD ISO/DIS 7380-1:2021(E)
Fasteners — Button head screws with reduced
loadability —
Part 1:
Hexagon socket button head screws
1 Scope
This document specifies the characteristics of hexagon socket button head screws with reduced
loadability due to head design with metric coarse pitch threads M3 to M16, and with product grade A.
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. The loadability in the
head is assumed to be 80% of that in the thread for all sizes and all property classes, see Table 3.
If, in certain cases, other specifications are requested, stainless steel grades can be selected from
ISO 3506-1, and the dimensional options from ISO 888 or ISO 4753.
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
...