FprEN ISO 8743

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

Fixations - Goupilles cannelées - Cannelures centrales sur la moitié de la longueur (ISO/FDIS 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.

Vezni element - Zasekani zatiči z utori - Polovične dolžine v sredini (ISO/FDIS 8743:2026)

General Information

• Status: Not Published
• Publication Date: 21-Jul-2026
• 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: 5060 - Closure of Vote - Formal Approval
• Start Date: 21-Apr-2026
• Completion Date: 21-Apr-2026
• Ref Project: kSIST FprEN ISO 8743:2026 - Fasteners - Grooved pins - Half-length centre grooved (ISO/FDIS 8743:2026)

Relations

• Consolidated By: ISO 8743 - Fasteners — Grooved pins — Half-length centre grooves
• Effective Date: 12-Feb-2026
• Revises: EN ISO 8743:1997 - Grooved pins - Half-length centre grooved (ISO 8743:1997)
• Effective Date: 05-Nov-2024

Overview

FprEN ISO 8743: Fasteners - Grooved pins - Half-length centre grooved (ISO/FDIS 8743:2026) specifies the characteristics and requirements for grooved pins with half-length centre oval grooves-commonly referred to as half-length centre grooved pins. Developed by the European Committee for Standardization (CEN) and ISO/TC 2, this international standard unifies the technical criteria for these fasteners across global markets. The document covers grooved pins manufactured from steel and stainless steel with nominal diameters from 1 mm to 25 mm, providing a standardized framework for design, production, and application.

Key Topics

• Pin Characteristics: The standard details the dimensions, tolerances, shapes (rounded or chamfered ends), and groove specifications for half-length centre grooved pins, ensuring interchangeability and reliable performance.
• Materials: Pins can be produced from a range of materials:
  • Steel
  • Stainless steel (grades A1, A2, A4, C1, F1)
  • Other materials, such as hardened steels, brass, and aluminium, as agreed between supplier and purchaser
• Surface Finishes: Guidance is provided for coatings and surface treatments, including:
  • As processed (for steel)
  • Clean and bright (for stainless steel)
  • Electroplated coatings (ISO 4042)
  • Non-electrolytically applied zinc flake coatings (ISO 10683)
  • Phosphate coatings (ISO 9717)
• Functional Requirements: These grooved pins are designed for:
  • Ensuring relative rotation of assembled parts
  • Precise positioning and guiding
  • Easy installation due to a symmetrical shape
  • High pull-out resistance as a result of elastic fit design
• Inspection and Quality: Specifies standards for acceptance inspection, labelling, and designation, ensuring traceability and consistent quality control.

Applications

Grooved pins with half-length centre grooves are utilized in diverse industrial sectors due to their robust mechanical properties and adaptable design. Common applications include:

• Automotive: Used for joining and indexing components that require reliable rotational movement or alignment under repeated use.
• Machinery: Serve as positioning or locating elements in assemblies where secure but removable fasteners are required.
• Electronics and Appliances: Employed in subassemblies for precise guiding and ease of assembly.
• General Manufacturing: Suitable as fastening or anti-rotation solutions in tools, fixtures, and mechanical joints.

The design allows for straightforward installation and removal, particularly valuable in maintenance-heavy environments or in applications requiring frequent component replacement.

Related Standards

The following international standards are referenced in FprEN ISO 8743 for terminology, technical requirements, and related fastener types:

• ISO 13669: General requirements for grooved pins
• ISO 3506-6: Selection of stainless steels and nickel alloys for fasteners
• ISO 4042: Electroplated coating systems for fasteners
• ISO 9717: Phosphate coatings on fasteners
• ISO 10683: Non-electrolytically applied zinc flake coatings
• ISO 3269: Acceptance inspection standards
• ISO 1891-4: Fastener terminology - quality control and acceptance
• Other ISO grooved pin standards: ISO 8739, ISO 8740, ISO 8741, ISO 8742, ISO 8744, ISO 8745, ISO 8746, ISO 8747, ISO 13670, ISO 13672

Practical Value

By adhering to FprEN ISO 8743, manufacturers, suppliers, and engineers can ensure seamless global sourcing of grooved pins, compatibility across equipment, and reliability in demanding applications. The standard underscores the importance of standardized dimensions, material quality, and inspection processes-delivering confidence in mechanical assemblies and promoting international supply chain efficiency for half-length centre grooved pins.

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO 8743:2025
01-julij-2025
Zasekani zatiči z brazdami enake globine na pol dolžine v sredini (ISO/DIS
8743:2025)
Grooved pins - Half-length centre grooved (ISO/DIS 8743:2025)
Verbindungselemente - Knebelkerbstifte mit langen Kerben (ISO/DIS 8743:2025)
Goupilles cannelées à cannelures centrales constantes sur la moitié de la longueur non
débouchantes (ISO/DIS 8743:2025)
Ta slovenski standard je istoveten z: prEN ISO 8743
ICS:
21.060.50 Zatiči, žeblji Pins, nails
oSIST prEN ISO 8743:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 8743:2025
oSIST prEN ISO 8743:2025
DRAFT
International
Standard
ISO/DIS 8743
ISO/TC 2
Grooved pins — Half-length centre
Secretariat: DIN
grooved
Voting begins on:
Goupilles cannelées à cannelures centrales constantes sur la
2025-04-16
moitié de la longueur non débouchantes
Voting terminates on:
ICS: 21.060.50 2025-07-09
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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.
Reference number
ISO/DIS 8743:2025(en)
oSIST prEN ISO 8743:2025
DRAFT
ISO/DIS 8743:2025(en)
International
Standard
ISO/DIS 8743
ISO/TC 2
Grooved pins — Half-length
Secretariat: DIN
centre grooved
Voting begins on:
Goupilles cannelées à cannelures centrales constantes sur la
moitié de la longueur non débouchantes
Voting terminates on:
ICS: 21.060.50
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 8743:2025(en)
ii
oSIST prEN ISO 8743:2025
ISO/DIS 8743:2025(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 . 6
8 Designation . 6
Bibliography . 8

iii
oSIST prEN ISO 8743:2025
ISO/DIS 8743:2025(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 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 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
oSIST prEN ISO 8743:2025
DRAFT International Standard ISO/DIS 8743:2025(en)
Grooved pins — Half-length centre grooved
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 l
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