SIST EN ISO 8741:2025
(Main)Fasteners - Reverse-taper grooved pins - Half-length progressive grooves (ISO 8741:2025)
Fasteners - Reverse-taper grooved pins - Half-length progressive grooves (ISO 8741:2025)
This document specifies the characteristics of reverse-taper grooved pins with half-length progressive grooves (with closed ends), in steel and stainless steel, and with nominal diameter 1 mm to 25 mm.
These grooved pins are designed to fulfil the main following functions:
— positioning or guiding, and
— relative rotation of the assembled parts,
with an easy installation (due to its shape) and a medium level of pull-out resistance (due to the elastic fit behaviour of the pin).
The general requirements (including functional principles for grooved pins and assembly) are specified in ISO 13669.
Verbindungselemente - Steckkerbstifte (ISO 8741:2025)
Dieses Dokument legt die Eigenschaften von Steckkerbstiften (mit geschlossenen Enden) aus Stahl und nichtrostendem Stahl und mit einem Nenndurchmesser 1 mm bis 25 mm fest.
Diese Kerbstifte sind so ausgelegt, dass sie die folgenden Hauptfunktionen ausführen:
- Positionierung oder Führung; und
- relative Drehung der zusammengebauten Teile;
mit einem einfachen Einbau (durch deren Form) und mit mittlerer Auszugsfestigkeit (durch das elastische Passverhalten des Stifts).
ANMERKUNG Die allgemeinen Anforderungen (einschließlich Grundlagen hinsichtlich der Funktion für Kerbstifte und Zusammenbau) sind in ISO 13669 festgelegt.
Fixations - Goupilles cannelées inversées - Cannelures progressives sur la moitié de la longueur (ISO 8741:2025)
La présente Norme internationale prescrit les caractéristiques des goupilles cannelées en acier ou en acier inoxydable austénitique, à trois cannelures progressives renversées sur la moitié de leur longueur, non débouchantes et régulièrement espacées, de diamètre nominal, d1, de 1,5 mm à 25 mm inclus. Le matériau refoulé de chaque côté des cannelures forme un renflement dont le diamètre d2, supérieur au diamètre nominal d1, permet un ajustement serré de ces goupilles cannelées lorsqu'elles sont emmanchées en force dans un trou de diamètre de perçage égal au diamètre nominal de la goupille d1 (voir article 4).
Vezni elementi - Zatiči s povratnimi utori - Postopni utori polovične dolžine (ISO 8741:2025)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2025
Vezni elementi - Zatiči s povratnimi utori - Postopni utori polovične dolžine (ISO
8741:2025)
Fasteners - Reverse-taper grooved pins - Half-length progressive grooves (ISO
8741:2025)
Verbindungselemente - Steckkerbstifte (ISO 8741:2025)
Fixations - Goupilles cannelées inversées - Cannelures progressives sur la moitié de la
longueur (ISO 8741:2025)
Ta slovenski standard je istoveten z: EN ISO 8741:2025
ICS:
21.060.50 Zatiči, žeblji Pins, nails
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 8741
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2025
EUROPÄISCHE NORM
ICS 21.060.50 Supersedes EN ISO 8741:1997
English Version
Fasteners - Reverse-taper grooved pins - Half-length
progressive grooves (ISO 8741:2025)
Fixations - Goupilles cannelées inversées - Cannelures Verbindungselemente - Steckkerbstifte (ISO
progressives sur la moitié de la longueur (ISO 8741:2025)
8741:2025)
This European Standard was approved by CEN on 2 March 2025.
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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8741:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 8741:2025) 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 September 2025, and conflicting national standards
shall be withdrawn at the latest by September 2025.
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 8741:1997.
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 8741:2025 has been approved by CEN as EN ISO 8741:2025 without any modification.
International
Standard
ISO 8741
Third edition
Fasteners — Reverse-taper
2025-02
grooved pins — Half-length
progressive grooves
Fixations — Goupilles cannelées inversées — Cannelures
progressives sur la moitié de la longueur
Reference number
ISO 8741:2025(en) © ISO 2025
ISO 8741:2025(en)
© ISO 2025
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
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 8741:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle of grooved pins and assembly . 1
5 Dimensions . 2
6 Requirements and reference International Standards . 6
7 Labelling on package . 6
8 Designation . 7
Bibliography . 8
iii
ISO 8741:2025(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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, 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 third edition cancels and replaces the second edition (ISO 8741:1997), which has been technically
revised.
The main changes are as follows:
— terms and definitions, principles for grooved pins and assembly (including hole dimensions), control of
the expanded diameter d and pin straightness, mechanical and physical properties (including shear
resistance and hardness) and inspection which are common for all grooved pins (product standards
ISO 8739 to ISO 8747, ISO 13670 and ISO 13672) have been specified in the new reference standard
ISO 13669 dealing with general requirements;
— non-preferred diameters 1 mm, 3,5 mm, 7 mm, 9 mm, 14 mm and 18 mm have been added;
— values of expanded diameter d for steel pins have been slightly increased for the shortest length range,
and have been added for stainless steel pins;
— tolerances for the rounded end and values for the chamfered end have been added;
— tolerances for the length of the grooves and their location have been added;
— stainless steel grades A2, A4, C1 and F1 have been added;
— other materials (such as hardened steels, brass, aluminium) are by agreement (see Table 3);
— specifications for labelling have been added as Clause 8.
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.
iv
International Standard ISO 8741:2025(en)
Fasteners — Reverse-taper grooved pins — Half-length
progressive grooves
1 Scope
This document specifies the characteristics of reverse-taper grooved pins with half-length progressive
grooves (with closed ends), in steel and stainless steel, and with nominal diameter 1 mm to 25 mm.
These grooved pins are designed to fulfil the main following functions:
— positioning or guiding, and
— relative rotation of the assembled parts,
with an easy installation (due to its shape) and a medium level of pull-out resistance (due to the elastic fit
behaviour of the pin).
The general requirements (including functional principles for grooved pins and assembly) are specified in
ISO 13669.
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 1891-4, Fasteners — Vocabulary — Part 4: Control, inspection, delivery, acceptance and quality
ISO 3269, Fasteners — Acceptance inspection
ISO 3506-6, Fasteners — Mechanical properties of corrosion-resistant stainless steel fasteners — Part 6: General
rules for the selection of stainless steels and nickel alloys for fasteners
ISO 4042, Fasteners — Electroplated coating systems
ISO 9717, Metallic and other inorganic coatings — Phosphate conversion coating of metals
ISO 10683, Fasteners — Non-electrolytically applied zinc flake coating systems
ISO 13669, Fasteners — Grooved pins — General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13669 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Principle of grooved pins and assembly
The principles of grooved pins and assembly specified in ISO 13669 shall apply.
ISO 8741:2025(en)
5 Dimensions
Dimensions shall be in accordance with Figure 1 and with Tables 1 and 2. The control of the expanded
diameter d and pin straightness t shall be as specified in ISO 13669.
For coated pins, dimensions and tolerances shall apply prior to coating.
Unless otherwise agreed at the time of the order, the pins are manufactured with rounded ends.
a) Pin with rounded ends (RN)
b) Option: pin with chamfered ends (CH)
Key
1 insertion side
a
The pin diam
...
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