SIST EN ISO 8743:2026

Fasteners - Grooved pins - Half-length centre grooved (ISO 8743:2026)

This document specifies the characteristics of grooved pins with half-length centre oval 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:
relative rotation of the assembled parts, and
positioning or guiding,
with an easy installation (due to its symmetrical shape) and a high 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 - Knebelkerbstifte mit langen Kerben (ISO 8743:2026)

Fixations - Goupilles cannelées - Cannelures centrales sur la moitié de la longueur (ISO 8743:2026)

Le présent document spécifie les caractéristiques des goupilles cannelées à cannelures centrales ovales sur la moitié de la longueur (non-débouchantes), en acier et en acier inoxydable, et de diamètre nominal 1 mm à 25 mm.
Ces goupilles cannelées sont conçues pour remplir les fonctions principales suivantes:
rotation relative des pièces assemblées, et
positionnement ou guidage,
avec une installation facile (du fait de sa forme symétrique) et une résistance à l'extraction élevée (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.

Pritrdilni elementi - Zatiči z utorom - Polovično dolžinski z osrednjim utorom (ISO 8743:2026)

Ta dokument določa lastnosti zatičev z utori s polovično dolžino ovalnih utorov (z zaprtimi konci), iz jekla in nerjavnega jekla, z nazivnim premerom od 1 mm do 25 mm.
Ti zatiči z utori so zasnovani za izpolnjevanje naslednjih glavnih funkcij:
- relativna rotacija sestavnih delov, in
- pozicioniranje ali vodenje,
z enostavno vgradnjo (zaradi simetrične oblike) in visoko stopnjo odpornosti proti izvleku (zaradi elastičnega prileganja zatiča).
Splošne zahteve (vključno s funkcionalnimi načeli za zatiče z utori in sestavljanje) so določene v ISO 13669.

General Information

• Status: Published
• Public Enquiry End Date: 08-Jul-2025
• Publication Date: 18-Jun-2026
• ICS: 21.060.50 - Pins, nails
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 11-Jun-2026
• Due Date: 16-Aug-2026
• Completion Date: 19-Jun-2026
• Ref Project: EN ISO 8743:2026 - Fasteners - Grooved pins - Half-length centre grooved (ISO 8743:2026)

Relations

• Revises: SIST EN ISO 8743:2001 - Grooved pins - Half-length centre grooved (ISO 8743:1997)
• Effective Date: 05-Nov-2024

Overview

SIST EN ISO 8743:2026 specifies the characteristics and requirements for grooved pins with half-length centre oval grooves (with closed ends), made from steel and stainless steel, and with nominal diameters from 1 mm to 25 mm. These specialized fasteners are widely used in mechanical assemblies where quick installation, relative movement, and precise positioning of parts are required. The standard details the general principles for the design and assembly of grooved pins, dimensional requirements, material specifications, surface finishes, labelling, and designations.

Key Topics

• Scope and Application: Covers grooved pins with half-length centre oval grooves in both steel and stainless steel for diameters ranging from 1 mm to 25 mm.
• Functional Design: Focuses on their ability to allow relative rotation between assembled parts, positioning, and guiding through a symmetrical shape that ensures easy installation and a high degree of pull-out resistance due to the pin's elastic fit.
• Material Requirements: Specifies acceptable materials, including various grades of steel and stainless steels (e.g., A2, A4, C1, F1), while allowing for other materials by agreement between purchaser and manufacturer.
• Dimensional Standards: Provides detailed measurement tolerances for diameter, groove location, and overall length, harmonizing with general requirements outlined in ISO 13669.
• Surface Treatments: Outlines permitted coatings and finishes (e.g., electroplated, non-electrolytic zinc flake coatings, phosphates) and criteria for delivery conditions.
• Marking and Package Labelling: Mandates comprehensive labelling information, including size, material, surface condition, manufacturer, lot number, and ISO reference, to ensure traceability and compliance.

Applications

Grooved pins specified in ISO 8743:2026 are critical components across a range of industries and engineering applications, such as:

• Mechanical Assemblies: Used to position, guide, or join components while maintaining the possibility for controlled movement or rotation.
• Automotive Manufacturing: Essential for securing parts that require alignment yet must be easily assembled or disassembled during maintenance.
• Machinery and Equipment: Facilitate the installation and retention of moving parts where pull-out resistance and ease of alignment are required.
• Electronics Enclosures: Used for aligning and fastening components in electronic housings, ensuring structural stability and straightforward assembly.
• Fixtures and Tooling: Common in jigs and fixtures where precise, repeatable positioning is vital for high-quality series production.

Thanks to their symmetrical design, grooved pins offer straightforward installation, reducing assembly time and risk of error. Their elastic fit characteristic ensures a high level of pull-out resistance, making them reliable in dynamic or high-vibration environments.

Related Standards

For comprehensive implementation and compatibility, consider these related international fastener standards:

• ISO 13669: General requirements for grooved pins, including principles, assembly, and functional testing.
• ISO 8740 - ISO 8747: A series of standards covering other types of grooved and taper pins, including parallel and progressive groove designs.
• ISO 3269: Inspection and acceptance protocols for fasteners.
• ISO 3506-6: Mechanical properties and the selection of corrosion-resistant stainless steels for fasteners.
• ISO 4042 and ISO 10683: Specifications for electroplated and zinc flake coating systems for fasteners.
• ISO 16048: Passivation of stainless steel fasteners.

By adhering to SIST EN ISO 8743:2026 and the referenced standards, manufacturers and users ensure the reliability, safety, and quality of pinned assemblies across a variety of fields, supporting both interoperability and international trade requirements.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2026
Vezni element - Zasekani zatiči z utori - Polovične dolžine v sredini (ISO 8743:2026)
Fasteners - Grooved pins - Half-length centre grooved (ISO 8743:2026)
Verbindungselemente - Knebelkerbstifte mit langen Kerben (ISO 8743:2026)
Fixations - Goupilles cannelées - Cannelures centrales sur la moitié de la longueur (ISO
8743:2026)
Ta slovenski standard je istoveten z: EN ISO 8743:2026
ICS:
21.060.50 Zatiči, žeblji Pins, nails
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 8743
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2026
EUROPÄISCHE NORM
ICS 21.060.50 Supersedes EN ISO 8743:1997
English Version
Fasteners - Grooved pins - Half-length centre grooved (ISO
8743:2026)
Fixations - Goupilles cannelées - Cannelures centrales Verbindungselemente - Knebelkerbstifte mit langen
sur la moitié de la longueur (ISO 8743:2026) Kerben (ISO 8743:2026)
This European Standard was approved by CEN on 22 May 2026.

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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8743:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 8743:2026) 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 December 2026, and conflicting national standards
shall be withdrawn at the latest by December 2026.
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 8743:1997.
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 8743:2026 has been approved by CEN as EN ISO 8743:2026 without any modification.

International
Standard
ISO 8743
Third edition
Fasteners — Grooved pins — Half-
2026-05
length centre grooves
Fixations — Goupilles cannelées — Cannelures centrales sur la
moitié de la longueur
Reference number
ISO 8743:2026(en) © ISO 2026
ISO 8743:2026(en)
© ISO 2026
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 8743:2026(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 . 6
7 Labelling on package . 6
8 Designation . 7
Bibliography . 8

iii
ISO 8743:2026(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 8743:1997) 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, 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 ha
...