FprEN ISO 14581

Fasteners - Hexalobular socket countersunk flat head screws (common head style) with reduced loadability (ISO/FDIS 14581:2022)

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 (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 3.
NOTE 2   Hexalobular socket countersunk head screws (high head), with full loadability are specified in ISO 14582, but these products are not interchangeable, because of different head heights.
NOTE 3   Particular attention is needed to ensure alignment of the countersunk head with the bearing surface of the countersink in the assembly.

Verbindungselemente - Senkschrauben mit Innensechsrund (Einheitskopf) mit reduzierter Belastbarkeit (ISO/FDIS 14581:2022)

Dieses Dokument legt die Eigenschaften von Senkschrauben mit Innensechsrund mit reduzierter Belastbarkeit aufgrund ihrer Kopfgeometrie in Stahl und nichtrostendem Stahl mit metrischen Regelgewinden von M2 bis M10 in Produktklasse A fest.
Falls in bestimmten Fällen andere Festlegungen gefordert werden, können die nichtrostenden Stahlsorten nach ISO 3506 1, und maßbezogene Wahlmöglichkeiten nach ISO 888 oder ISO 4753 ausgewählt werden.
ANMERKUNG 1   Die reduzierte Belastbarkeit (bezogen auf die Kopfgeometrie in Kombination mit der in diesem Dokument festgelegten Eindringtiefe des Innensechsrunds) bringt eine Begrenzung der Mindestbruchkraft mit sich, die durch eine spezifische Kennzeichnung (Festigkeitsklasse mit vorangestellter Null) angezeigt wird. Es wird angenommen, dass die Belastbarkeit im Kopf 80 % der Belastbarkeit im Gewinde für alle Größen und alle Festigkeitsklassen beträgt; siehe Tabelle 3.
ANMERKUNG 2   Senkkopfschrauben mit Innensechsrund (mit hohem Kopf) mit voller Belastbarkeit sind in ISO 14582 festgelegt, jedoch sind diese Produkte aufgrund unterschiedlicher Kopfhöhen nicht austauschbar.
ANMERKUNG 3   Besondere Aufmerksamkeit ist notwendig, um ein Fluchten des Senkkopfes mit der Auflagefläche der Ansenkung in der Baugruppe sicherzustellen.

Fixations - Vis à tête fraisée à six lobes internes (tête commune) à capacité de charge réduite (ISO/FDIS 14581:2022)

Le présent document spécifie les caractéristiques des vis à tête fraisée à six lobes internes 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 M2 à M10, 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 1      La capacité de charge réduite (du fait des dimensions de la tête fraisée et de la profondeur de pénétration du six pans creux spécifiées dans le présent document) implique une limitation de la charge minimale de rupture à la traction, indiquée par un marquage spécifique (classe de qualité prédédée 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 3.
NOTE 2      Les vis à tête fraisée à six lobes internes (tête haute), à capacité de charge intégrale, sont spécifiées dans l’ISO 14582, mais ces produits ne sont pas interchangeables en raison de hauteurs de tête différentes.
NOTE 3      Une attention toute particulière est nécessaire pour assurer l’alignement de la tête fraisée avec la fraisure de la surface d’appui lors de l’assemblage.

Vezni elementi - Notranji šestrogeljnik v ugrezni ploski glavi vijaka (običajna oblika glave) z manjšo obremenljivostjo (ISO/FDIS 14581:2022)

General Information

• Status: Not Published
• ICS: 21.060.10 - Bolts, screws, studs
• Technical Committee: CEN/TC 185 - Threaded and nonthreaded mechanical fasteners and accessories
• Current Stage: 6055 - CEN Ratification completed (DOR) - Publishing
• Due Date: 13-Jan-2022
• Ref Project: kSIST FprEN ISO 14581:2022 - Fasteners - Hexalobular socket countersunk flat head screws (common head style) with reduced loadability (ISO/FDIS 14581:2022)

RELATIONS

• Revised: EN ISO 14581:2013 - Fasteners - Hexalobular socket countersunk flat head screws (ISO 14581:2013)
• Effective Date: 12-Jun-2019

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN ISO 14581:2022
01-januar-2022

Vezni elementi - Notranji šestrogeljnik v ugrezni ploski glavi vijaka (običajna oblika

glave) z manjšo obremenljivostjo (ISO/DIS 14581:2021)

Fasteners - Hexalobular socket countersunk flat head screws (common head style) with

reduced loadability (ISO/DIS 14581:2021)

Mechanische Verbindungselemente - Senkschrauben mit Innensechsrund (Einheitskopf)

mit reduzierter Belastbarkeit (ISO/DIS 14581:2021)

Fixations - Vis à tête fraisée (tête commune) à six lobes internes à capacité de charge

réduite (ISO/DIS 14581:2021)
Ta slovenski standard je istoveten z: prEN ISO 14581
ICS:
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
oSIST prEN ISO 14581:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 14581:2022
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oSIST prEN ISO 14581:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 14581
ISO/TC 2/SC 11 Secretariat: DIN
Voting begins on: Voting terminates on:
2021-11-16 2022-02-08
Fasteners — Hexalobular socket countersunk flat head
screws (common head style) with reduced loadability

Fixations — Vis à tête fraisée réduite à six lobes internes à capacité de charge réduite

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 14581:2021(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 14581:2022
ISO/DIS 14581:2021(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

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ISO copyright office
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Website: www.iso.org
Published in Switzerland
© ISO 2021 – All rights reserved
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oSIST prEN ISO 14581:2022
ISO/DIS 14581:2021(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 ...................................................................................................................................................................................... 6

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

Annex A (informative) Minimum ultimate tensile loads for screws M2 and M2,5 with full

loadability ................................................................................................................................................................................................................... 9

Bibliography .............................................................................................................................................................................................................................10

iii
© ISO 2021 – All rights reserved
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oSIST prEN ISO 14581:2022
ISO/DIS 14581:2021(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 14581:2013), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— common head style added in title (see also ISO 7046-1 and ISO 7046-2);

— the whole standard has been improved to clearly point out that these hexalobular socket countersunk

flat head screws have reduced loadability because of their head design (head dimensions and

penetration of the hexalobular socket);

— option for partially threaded screws without underhead reinforcement (formerly designated

as “shoulder”) for range M2 to M4 has been added (see Figure 1 b) and reinforcement feature

for partially threaded screws M5 to M10 has been modified from a radius to a conical shape as

adjustment to manufacturing conditions (see Figure 1 d);
— detailed head configuration has been added (see Figure 2);
— shank diameter d has been added in Table 1;
— minimum head height k has been added as reference dimension in Table 1;
min

— radius r has been added in Figures 1 b), 1 c) and 1 d) and r has been added Table 1;

min
— minimum length ranges have been increased in Table 1;

— b has been introduced as a reference dimension which is applicable for partially threaded screws;

© ISO 2021 – All rights reserved
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oSIST prEN ISO 14581:2022
ISO/DIS 14581:2021(E)

— calculations for M2 and M2,5 have been added; 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 Annex A);

— the minimum ultimate tensile loads were recalculated and have been changed to more precise

values for M2, M2,5 (property classes 4.8, 8.8, 50 and 70), M3 (property classes 4.8, 50 and 70), M5

(property class 8.8), M6 (property classes 4.8, 50 and 70), M8 (property classes 50 and 70) and M10

(property class 70), see Table 3;
— property class 10.9 has been added in Table 2;
— new clause 4.2 “Gauging of head” has been added;
— new clause 6.2 “Labelling on package” has been added;

— with regard to “countersinks” reference to ISO 15065 has been added in Bibliography;

— references to ISO 7046-1 and ISO 7046-2 have been added in Bibliography.

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.
© ISO 2021 – All rights reserved
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oSIST prEN ISO 14581:2022
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oSIST prEN ISO 14581:2022
DRAFT INTERNATIONAL STANDARD ISO/DIS 14581:2021(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, made of 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 and ISO 4753.

NOTE 1 The reduced loadability (related to the countersunk 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.

NOTE 2 Hexalobular socket countersunk head screws, high head with full loadability, are specified in

ISO 14582, but these products are not interchangeable, because of different head heights.

NOTE 3 Particular attention is needed to ensure alignment of the countersunk head with the bearing surface

of the countersink in the assembly.
2  Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (in
...