EN ISO 8740:2025

Fasteners - Parallel grooved pins, with chamfer point - Full-length diamond grooves (ISO 8740:2025)

This document specifies the characteristics of parallel grooved pins with chamfer point and full-length diamond grooves (with open 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 function: locking together two or more parts, with an easy installation (due to the chamfer point) and a highest 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 – Zylinderkerbstifte mit Fase – Durchgehende Rautekerben (ISO 8740:2025)

Dieses Dokument legt die Eigenschaften von Zylinderkerbstiften mit gefastem Ende und durchgehenden Rautenuten (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 folgende Hauptfunktion ausführen: zwei oder mehr Teile kraftschlüssig miteinander verbinden, mit einem einfachen Einbau (durch das gefaste Ende) und mit höchster 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 constantes, à bout chanfreiné - Cannelures diamant sur toute la longueur (ISO 8740:2025)

Le présent document spécifie les caractéristiques des goupilles cannelées constantes, à bout chanfreiné et cannelures diamant sur toute la longueur (débouchantes), en acier et en acier inoxydable, et de diamètre nominal 1 mm à 25 mm.
Ces goupilles cannelées sont conçues pour remplir la fonction principale suivante: solidarisation de deux ou plusieurs pièces, avec une installation facile (du fait du bout chanfreiné) et une résistance à l'extraction au plus haut niveau (du fait du comportement par ajustement élastique de la goupille dans son trou).
Les exigences générales (incluant les principes fonctionnels des goupilles cannelées et leur assemblage) sont spécifiées dans l'ISO 13669.

Vezni elementi - Zatiči z vzporednimi utori s posneto konico - Diamantni utori (žlebiči) po celotni dolžini (ISO 8740:2025)

Ta dokument določa značilnosti zatičev z vzporednimi utori s posneto konico, z diamantnimi utori (žlebiči) po celotni dolžini (z zaprtimi konci), iz jekla in nerjavnega jekla ter z nazivnim premerom od 1 mm do 25 mm. Ti zatiči z utori so zasnovani tako, da izpolnjujejo naslednjo glavno funkcijo: spajanje dveh ali več delov, z enostavno namestitvijo (zaradi posnete konice) in najvišjo stopnjo odpornosti proti izvleku (zaradi elastičnega prileganja zatiča). Splošne zahteve (vključno s funkcionalnimi načeli za zatiče z utori in sestavo) so določene v standardu ISO 13669.

General Information

• Status: Published
• Publication Date: 04-Mar-2025
• ICS: 21.060.50 - Pins, nails
• Technical Committee: CEN/TC 185 - Threaded and nonthreaded mechanical fasteners and accessories
• Drafting Committee: CEN/TC 185 - Threaded and nonthreaded mechanical fasteners and accessories
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 05-Mar-2025
• Completion Date: 05-Mar-2025
• Ref Project: SIST EN ISO 8740:2025 - Fasteners - Parallel grooved pins, with chamfer point - Full-length diamond grooves (ISO 8740:2025)

Relations

• Replaces: EN ISO 8740:1997 - Grooved pins - Full-length parallel grooved, with chamfer (ISO 8740:1997)
• Effective Date: 18-Jan-2023

Overview

EN ISO 8740:2025 (Fasteners - Parallel grooved pins, with chamfer point - Full-length diamond grooves) defines the characteristics, dimensions and requirements for parallel grooved pins with a chamfer point and full‑length diamond grooves (open ends). The standard covers pins made from steel and stainless steel with nominal diameters from 1 mm to 25 mm and specifies their primary function: locking two or more parts together with easy installation (chamfer point) and high pull‑out resistance due to the pin’s elastic fit.

Key topics and technical requirements

• Scope & function: Pins for mechanical locking and assembly with maximum pull‑out resistance.
• Materials: Steel and stainless steel (stainless grades A2, A4, C1 and F1 are included); other materials allowed by agreement if mechanical/physical properties are met.
• Dimensions & tolerances: Detailed dimension tables for diameters 1–25 mm, length ranges, and requirements for expanded diameter (d) and pin straightness (t). Because grooves run full length, diameter d must be controlled before grooving.
• Ends & geometry: Pins are supplied with a chamfer point for insertion; rounded ends are the default. Chamfer‑end option has been deleted in this edition.
• Mechanical & surface requirements: As‑processed tolerances, hardness and shear resistance follow general requirements in ISO 13669; surface finishes and coatings referenced (ISO 4042, ISO 9717, ISO 10683).
• Quality & inspection: Acceptance inspection per ISO 3269; workmanship must be free of burrs and detrimental defects.
• Labelling & designation: Clause on packaging labelling and standardised designation added to facilitate supply and traceability.

Applications and who uses it

EN ISO 8740:2025 is used by:

• Design and mechanical engineers specifying reliable fastening solutions for assemblies.
• Fastener manufacturers and suppliers for production, quality control and product data sheets.
• Quality assurance and inspection teams implementing acceptance criteria and dimensional checks.
• Purchasing and procurement to ensure ordered components comply with a recognised standard.

Typical uses include any assembly requiring precise, high‑retention pins to lock components together and allow straightforward installation via chamfered insertion.

Related standards

• ISO 13669 - Grooved pins - General requirements (functional principles, hole dimensions, control of expanded diameter and straightness)
• ISO 3269 - Acceptance inspection
• ISO 3506‑6 - Selection of stainless steels for fasteners
• ISO 4042, ISO 9717, ISO 10683 - Coating and surface treatment references

EN ISO 8740:2025 provides clear dimensional, material and inspection guidance for specifying and producing parallel grooved pins with chamfer point and full‑length diamond grooves, improving interchangeability and performance in mechanical assemblies.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2025
Vezni elementi - Zatiči z vzporednimi utori s posneto konico - Diamantni utori
(žlebiči) po celotni dolžini (ISO 8740:2025)
Fasteners - Parallel grooved pins, with chamfer point - Full-length diamond grooves (ISO
8740:2025)
Verbindungselemente - Zylinderkerbstifte mit Fase - Diamant-Nut über die gesamte
Länge (ISO 8740:2025)
Fixations - Goupilles cannelées constantes, à bout chanfreiné - Cannelures diamant sur
toute la longueur (ISO 8740:2025)
Ta slovenski standard je istoveten z: EN ISO 8740:2025
ICS:
21.060.50 Zatiči, žeblji Pins, nails
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 8740
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2025
EUROPÄISCHE NORM
ICS 21.060.50 Supersedes EN ISO 8740:1997
English Version
Fasteners - Parallel grooved pins, with chamfer point -
Full-length diamond grooves (ISO 8740:2025)
Fixations - Goupilles cannelées constantes, à bout Verbindungselemente - Zylinderkerbstifte mit Fase -
chanfreiné - Cannelures diamant sur toute la longueur Durchgehende Rautekerben (ISO 8740:2025)
(ISO 8740:2025)
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 8740:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 8740:2025) 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 8740:1997.
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 8740:2025 has been approved by CEN as EN ISO 8740:2025 without any modification.

International
Standard
ISO 8740
Third edition
Fasteners — Parallel grooved pins,
2025-02
with chamfer point — Full-length
diamond grooves
Fixations — Goupilles cannelées constantes, à bout chanfreiné —
Cannelures diamant sur toute la longueur
Reference number
ISO 8740:2025(en) © ISO 2025
ISO 8740:2025(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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 8740:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principles of grooved pins and assembly . 1
5 Dimensions . 2
6 Requirements and reference International Standards . 5
7 Labelling on package . 5
8 Designation . 6
Bibliography . 7

iii
ISO 8740:2025(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 8740:1997) 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 requ
...