EN ISO 8742:2026

Fasteners - Grooved pins - One-third-length center grooves (ISO 8742:2026)

This document specifies the characteristics of grooved pins with one-third-length centre oval grooves (with closed ends), in steel and stainless steel, and with a nominal diameter from 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 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 - Knebelkerbstifte mit kurzen Kerben (ISO 8742:2026)

Fixations - Goupilles cannelées - Cannelures centrales sur le tiers de la longueur (ISO 8742:2026)

Le présent document spécifie les caractéristiques des goupilles cannelées à cannelures centrales ovales sur le tiers 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 elementi - Zasekani zatiči z utori - Sredinski zatiči z utori dolžine ene tretjine celotnega zatiča (ISO 8742:2026)

General Information

• Status: Published
• Publication Date: 07-Apr-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: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 08-Apr-2026
• Completion Date: 08-Apr-2026
• Ref Project: SIST EN ISO 8742:2026 - Fasteners - Grooved pins - One-third-length center grooves (ISO 8742:2026)

Relations

• Replaces: EN ISO 8742:1997 - Grooved pins - One-third-length centre grooved (ISO 8742:1997)
• Effective Date: 05-Nov-2024
• Consolidated By: ISO 8742:2026 - Fasteners — Grooved pins — One-third-length center grooves
• Effective Date: 12-Feb-2026

Overview

EN ISO 8742:2026, published by CEN, specifies the characteristics and requirements for grooved pins featuring one-third-length center oval grooves with closed ends. These fasteners are manufactured in steel and stainless steel, suitable for nominal diameters from 1 mm to 25 mm. The standard ensures that grooved pins are designed to allow for the relative rotation of assembled parts, precise positioning or guiding, and efficient installation due to their symmetrical shape. Medium pull-out resistance is achieved through the elastic fit behavior inherent to the pin’s design. General principles and assembly requirements are further detailed in ISO 13669.

Key Topics

• Product Scope: Covers grooved pins with one-third-length center grooves, catering to a diverse range of nominal diameters and material grades, including steel and multiple grades of stainless steel (A2, A4, C1, F1).
• Functional Performance: Designed for:
  • Facilitating relative rotation between assembled components
  • Positioning and guiding applications where precise alignment is critical
  • Ensuring moderate resistance to removal due to the elastic interference fit
• Design Attributes:
  • Symmetrical and closed-ended grooves allow for easy, bi-directional installation
  • Standardized options for rounded or chamfered ends based on application needs
• Dimensions and Tolerances: Strictly defined for consistency in performance and interchangeability across various industrial uses. The standard includes detailed tolerances for grooving and pin straightness.
• Surface Condition and Marking: Outlines acceptable finishing processes, including electroplated coatings, passivation, and labeling on packaging for clear identification and traceability.

Applications

Grooved pins specified under EN ISO 8742:2026 are widely used in mechanical engineering, manufacturing, and assembly operations where reliable alignment and rotational movement are required. Typical applications include:

• Automotive assemblies: Used as locating and guiding pins in gearboxes, axles, and subassemblies.
• Machinery and equipment: For precise positioning of parts, hinges, levers, and articulated systems.
• Fixtures and jigs: Serve as robust reference points in manufacturing tooling.
• Appliances and consumer goods: Where parts require alignment but occasional disassembly or rotation is necessary.
• Electronics and electrical devices: In assemblies where non-permanent, yet secure, connections are preferred.

The standard’s medium pull-out resistance is ideal for situations where pins need to resist moderate axial forces but can be conveniently installed or replaced without specialized equipment.

Related Standards

The following international standards provide complementary or alternative specifications for grooved pins and associated fasteners:

• ISO 13669: General requirements and functional principles for grooved pins and their assembly.
• ISO 13670: Reverse-taper grooved pins - one quarter-length progressive grooves.
• ISO 8739, ISO 8740, ISO 8741, ISO 8743 - ISO 8747: Cover various designs of grooved pins, including full-length and half-length grooves, different head styles, and other geometries.
• ISO 3506-6: Mechanical properties of corrosion-resistant stainless steel fasteners.
• ISO 4042, ISO 10683, ISO 9717: Standards for coatings and surface treatments.
• ISO 3269: Acceptance inspection for fastener quality assurance.
• ISO 1891-4: Vocabulary and protocols for control, inspection, and identification of fasteners.
• ISO 16048: Passivation of stainless-steel fasteners.

Practical Value

EN ISO 8742:2026 helps manufacturers, engineers, and quality professionals ensure the interchangeability, functional performance, and traceability of grooved pins within a global supply chain. Adhering to this standard simplifies procurement, enhances assembly reliability, and reduces the risk of misalignment or premature wear in critical applications. The use of harmonized dimensions and tolerances also supports cost-effective manufacturing and streamlined maintenance across industries.

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO 8742:2025
01-julij-2025
Vezni elementi - Zasekani zatiči z utori - Sredinski zatiči z utori dolžine ene tretjine
celotnega zatiča (ISO/DIS 8742:2025)
Fasteners - Grooved pins - One-third-length center grooves (ISO/DIS 8742:2025)
Verbindungselemente - Knebelkerbstifte mit kurzen Kerben (ISO/DIS 8742:2025)
Fixations - Goupilles cannelées - Cannelures centrales sur le tiers de la longueur
(ISO/DIS 8742:2025)
Ta slovenski standard je istoveten z: prEN ISO 8742
ICS:
21.060.50 Zatiči, žeblji Pins, nails
oSIST prEN ISO 8742:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 8742:2025
oSIST prEN ISO 8742:2025
DRAFT
International
Standard
ISO/DIS 8742
ISO/TC 2
Fasteners — Grooved pins — One-
Secretariat: DIN
third-length center grooves
Voting begins on:
ICS: 21.060.50
2025-05-26
Voting terminates on:
2025-08-18
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 8742:2025(en)
oSIST prEN ISO 8742:2025
DRAFT
ISO/DIS 8742:2025(en)
International
Standard
ISO/DIS 8742
ISO/TC 2
Fasteners — Grooved pins — One-
Secretariat: DIN
third-length center grooves
Voting begins on:
ICS: 21.060.50
Voting terminates on:
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 8742:2025(en)
ii
oSIST prEN ISO 8742:2025
ISO/DIS 8742:2025(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 8742:2025
ISO/DIS 8742:2025(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.
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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 8742:1997) 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 8742:2025
DRAFT International Standard ISO/DIS 8742:2025(en)
Fasteners — Grooved pins — One-third-length center grooves
1 Scope
This document specifies the characteristics of grooved pins with one-third-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 medium level of pull-out resistance (due to the
elastic fit behaviour of the pin).
The general requirements (including functional principles for grooved pin
...