ISO 8743:2026
(Main)Fasteners — Grooved pins — Half-length centre grooves
- Abstract
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.
- Status
- Published
- Publication Date
- 25-May-2026
- Technical Committee
- ISO/TC 2 - Fasteners
- Drafting Committee
- ISO/TC 2/WG 13 - Washer and non-threaded fasteners
- Current Stage
- 6060 - International Standard published
- Start Date
- 26-May-2026
- Due Date
- 31-Oct-2026
- Completion Date
- 26-May-2026
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ISO 8743:2026 - Fasteners — Grooved pins — Half-length centre grooves
ISO 8743:2026 - Fixations — Goupilles cannelées — Cannelures centrales sur la moitié de la longueur
ISO 8743:2026 is an International Standard from ISO for grooved pins with half-length centre oval grooves. It specifies the characteristics, dimensions, materials, surface conditions, package labelling and designation for steel and stainless steel pins with nominal diameters from 1 mm to 25 mm. The standard is used when a pin is needed for relative rotation, positioning or guiding, with easy installation and high pull-out resistance.
What does ISO 8743:2026 specify?
ISO 8743:2026 covers grooved pins with half-length centre oval grooves and closed ends, in steel and stainless steel. It also sets out how the document is organized, with clauses on scope, references, terms, principles, dimensions, material and surface requirements, package labelling and designation.
| Clause | What it covers |
|---|---|
| 1 | Scope and intended functions |
| 2 | Normative references |
| 3 | Terms and definitions |
| 4 | Principles of grooved pins and assembly |
| 5 | Dimensions |
| 6 | Requirements and reference International Standards |
| 7 | Labelling on package |
| 8 | Designation |
Clause 1 states the pin type, size range and main functions. Clause 5 and Clause 6 are the practical core for design and procurement, because they define the standard sizes, tolerances, materials, coatings and acceptance rules that users need to specify and check.
What are the key requirements of ISO 8743:2026?
ISO 8743:2026 defines the pin geometry, the standard size range, the permitted materials and finishes, and the information that must appear on the package. In practice, this is the information needed to order the right pin, make it to the right shape and inspect it consistently.
Geometry and size control
Clause 5 says the dimensions shall follow Figure 1 and Tables 1 and 2. The pin uses a symmetrical shape, with rounded ends as the default and chamfered ends only when requested at the time of order. The groove arrangement, groove length and location are controlled by tolerances, and the pin diameter d applies only where grooves are absent.
For users, this means the pin is not specified only by nominal diameter and length - the groove form and end style also matter for fit and assembly.
Dimensional tolerances and preferred sizes
Clause 5 gives standard diameter and length series, including some bracketed sizes marked as non-preferred. It also gives tolerance ranges for groove length and groove positioning based on the pin length. The expanded diameter d and pin straightness t are controlled according to ISO 13669.
For manufacturers and inspectors, these are the checks that determine whether a pin matches the standard size and can be accepted for use.
Materials, coatings and surface condition
Clause 6 ties the product to ISO 13669 for general requirements and to ISO 3506-6, ISO 4042, ISO 9717 and ISO 10683 for stainless steel selection and coating systems. The standard covers steel symbol St and stainless steel grades A1, A2, A4, C1 and F1. It also allows other materials by agreement between purchaser and manufacturer, with material properties and expanded diameter agreed before order.
For buyers, this means material and surface condition need to be stated clearly if the default steel or stainless steel condition is not enough for the application.
Workmanship and acceptance
Clause 6 requires pins to be free of burrs and detrimental defects, and acceptance inspection is specified by ISO 3269. For plated or coated pins, the dimensional limits apply before coating.
For quality control, this separates manufacturing defects from coating effects and gives a defined acceptance route.
Package labelling and designation
Clause 7 lists the minimum package information: the ISO 8743 reference, nominal diameter and length, CH where relevant, steel symbol or stainless grade, surface condition, supplier identification, lot number and quantity. Clause 8 gives the designation rule and the default delivery condition when no finish is stated.
For procurement and traceability, this is the information needed to identify the exact pin delivered and to link it to its lot.
What terms does ISO 8743:2026 define?
- Grooved pins - Pins with grooves that deform elastically in the hole and hold by fit.
- Half-length centre oval grooves - Grooves placed in the centre region over half the pin length, with an oval form and closed ends.
- Expanded diameter, d - The controlled diameter used in the grooved area for fit and assembly.
- Pin straightness, t - The straightness characteristic controlled together with the expanded diameter.
- RN - Rounded ends, the default end form for these pins.
- CH - Chamfered ends, used only when specifically requested in the order.
- St - The symbol used for steel pins.
- Acceptance inspection - The inspection route used for acceptance, as referenced to ISO 3269.
Who uses ISO 8743:2026?
ISO 8743:2026 is used by fastener manufacturers, distributors, purchasers, designers and quality inspectors. It helps them agree the pin type, confirm dimensions and surface condition, and document the package and lot identity for delivery and acceptance.
It is also relevant to assembly and maintenance teams that need grooved pins for relative rotation, positioning or guiding in mechanical assemblies.
What changed in ISO 8743:2026 from the previous edition?
ISO 8743:2026 cancels and replaces ISO 8743:1997. The foreword states that the revision moved the common terms, assembly principles, hole dimensions, expanded diameter control, straightness, mechanical and physical properties, and inspection into ISO 13669, added non-preferred diameters, updated expanded diameter values, added stainless steel values and grades, added tolerances for rounded and chamfered ends, added groove length and location tolerances, and added package labelling requirements in Clause 7.
Which standards are used with ISO 8743:2026?
- ISO 13669 - Gives the general requirements for grooved pins, including principles of grooved pins and assembly, and control of expanded diameter and straightness.
- ISO 1891-4 - Provides the lot numbering reference used for package labelling.
- ISO 3269 - Sets the acceptance inspection method.
- ISO 3506-6 - Supports stainless steel selection for fasteners.
- ISO 4042 - Covers electroplated coating systems.
- ISO 9717 - Covers phosphate conversion coatings.
- ISO 10683 - Covers non-electrolytically applied zinc flake coating systems.
What does the ISO 8743:2026 document contain?
ISO 8743:2026 contains Figure 1 for the pin form and end options, Tables 1 and 2 for sizes and tolerances, and Table 3 for material, surface condition and acceptance references. It also includes package labelling requirements and two designation examples that show how to identify a pin by diameter, length, end form, material and surface condition.
The document is structured for design, manufacturing, ordering and inspection. In practice, it tells users what to make, how to identify it, and which companion standards to use when checking material, coating and acceptance.
Relations
- Consolidates
EN ISO 8743:2026 - Fasteners - Grooved pins - Half-length centre grooved (ISO 8743:2026) - Effective Date
- 12-Feb-2026
- Effective Date
- 07-Jan-2025
- Effective Date
- 07-Jan-2025
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ISO 8743:2026 - Fasteners — Grooved pins — Half-length centre grooves
ISO 8743:2026 - Fixations — Goupilles cannelées — Cannelures centrales sur la moitié de la longueur
Frequently Asked Questions
ISO 8743:2026 is a standard published by the International Organization for Standardization (ISO). Its full title is "Fasteners — Grooved pins — Half-length centre grooves". This standard covers: 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.
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.
ISO 8743:2026 is classified under the following ICS (International Classification for Standards) categories: 21.060.50 - Pins, nails. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 8743:2026 has the following relationships with other standards: It is inter standard links to EN ISO 8743:2026, ISO/IEC 10918-7:2021, ISO 8743:1997. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 8743:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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 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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
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
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 hardened steels, brass, aluminium) are by agreement (see Table 3);
— specifications for labelling have been added as Clause 7.
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 8743:2026(en)
Fasteners — Grooved pins — Half-length centre grooves
1 Scope
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.
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 Pr
...
Norme
internationale
ISO 8743
Troisième édition
Fixations — Goupilles cannelées —
2026-05
Cannelures centrales sur la moitié
de la longueur
Fasteners — Grooved pins — Half-length centre grooves
Numéro de référence
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2026
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse
ii
Sommaire Page
Avant-propos .iv
1 Domaine d'application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Principes fonctionnels des goupilles cannelées et de leur assemblage . 2
5 Dimensions . 2
6 Exigences et Normes internationales de référence . 6
7 Étiquetage sur l’emballage . 6
8 Désignation . 7
Bibliographie . 8
iii
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux
de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général
confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document a
été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir
www.iso.org/directives).
L’ISO attire l’attention sur le fait que la mise en application du présent document peut entraîner l’utilisation
d’un ou de plusieurs brevets. L’ISO ne prend pas position quant à la preuve, à la validité et à l’applicabilité de
tout droit de propriété revendiqué à cet égard. À la date de publication du présent document, l’ISO n'avait pas
reçu notification qu’un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois,
il y a lieu d’avertir les responsables de la mise en application du présent document que des informations
plus récentes sont susceptibles de figurer dans la base de données de brevets, disponible à l'adresse
www.iso.org/brevets. L’ISO ne saurait être tenue pour responsable de ne pas avoir identifié tout ou partie de
tels droits de propriété.
Les appellations commerciales éventuellement mentionnées dans le présent document sont données pour
information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion de
l'ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles techniques au
commerce (OTC), voir www.iso.org/avant-propos.
Le présent document a été élaboré par le comité technique ISO/TC 2, Fixations, en collaboration avec le
comité technique CEN/TC 185, Fixations, du Comité européen de normalisation (CEN) conformément à
l’Accord de coopération technique entre l’ISO et le CEN (Accord de Vienne).
Cette troisième édition annule et remplace la deuxième édition (ISO 8743:1997) qui a fait l’objet d’une
révision technique.
Les principales modifications sont les suivantes:
— les termes et définitions, les principes d'utilisation des goupilles cannelées et leur assemblage (incluant
la dimension des trous), le contrôle du diamètre de renflement d et de la rectitude des goupilles, les
caractéristiques mécaniques et physiques (incluant la résistance au cisaillement et la dureté) et les
contrôles, communs à toutes les goupilles cannelées (normes de produits ISO 8739 à ISO 8747, ISO 13670
et ISO 13672) ont été spécifiés dans la nouvelle norme de référence ISO 13669, exigences générales;
— les diamètres non préférentiels 1 mm, 3,5 mm, 7 mm, 9 mm, 14 mm et 18 mm ont été ajoutés;
— les valeurs du diamètre de renflement d pour les goupilles en acier de la gamme de longueurs les plus
courtes ont été légèrement augmentées, et ont été ajoutées pour les goupilles en acier inoxydable;
— les tolérances pour les extrémités arrondies et les dimensions pour les extrémités chanfreinées ont été
ajoutées;
— les tolérances pour les longueurs des cannelures et leur emplacement ont été ajoutées;
— les grades d'acier inoxydables A2, A4, C1 et F1 ont été ajoutés;
— les autres matériaux (tels que les aciers traités thermiquement, le laiton, l'aluminium) sont par accord
(voir Tableau 3);
iv
— les spécifications pour l'étiquetage ont été ajoutées à l'Article 7.
Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent
document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes se
trouve à l’adresse www.iso.org/fr/members.html.
v
Norme internationale ISO 8743:2026(fr)
Fixations — Goupilles cannelées — Cannelures centrales sur
la moitié de la longueur
1 Domaine d'application
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.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie de leur
contenu, des exigences du présent document. Pour les références datées, seule l’édition citée s’applique. Pour
les références non datées, la dernière édition du document de référence s'applique (y compris les éventuels
amendements).
ISO 1891-4, Fixations — Vocabulaire — Partie 4: Contrôle, livraison, réception et qualité
ISO 3269, Fixations — Contrôle réception
ISO 3506-6, Fixations — Caractéristiques mécaniques des fixations en acier inoxydable résistant à la corrosion
— Partie 6: Règles générales pour la sélection des aciers inoxydables et des alliages de nickel pour les fixations
ISO 4042, Fixations — Systèmes de revêtements électrolytiques
ISO 9717, Revêtements métalliques et autres revêtements inorganiques — Couches de conversion au phosphate
sur métaux
ISO 10683, Fixations — Systèmes de revêtements non électrolytiques de zinc lamellaire
ISO 13669, Fixations — Goupilles cannelées — Exigences générales
3 Termes et définitions
Aucun terme n'est défini dans le présent document.
L'ISO et l'IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en normalisation,
consultables aux adresses suivantes :
— ISO Online browsing platform : disponible à l'adresse https:// www .iso .org/ obp
— IEC Electropedia : disponible à l'adresse https:// www .electroped
...