prEN ISO 8742

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)

La présente Norme internationale prescrit les caractéristiques des goupilles cannelées en acier ou en acier inoxydable austénitique, à trois cannelures centrales constantes sur le tiers de leur longueur, non débouchantes et régulièrement espacées, de diamètre nominal, d1, de 1,5 mm à 25 mm inclus. Le matériau refoulé de chaque côté des cannelures forme un renflement dont le diamètre d2, supérieur au diamètre nominal d1, permet un ajustement serré de ces goupilles cannelées lorsqu'elles sont emmanchées en force dans un trou de diamètre de perçage égal au diamètre nominal de la goupille d1 (voir article 4).

Vezni elementi - Zasekani zatiči z utori - Sredinski zatiči z utori dolžine ene tretjine celotnega zatiča (ISO/DIS 8742:2025)

General Information

• Status: Not Published
• Publication Date: 20-Dec-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: 4060 - Closure of enquiry - Enquiry
• Start Date: 18-Aug-2025
• Completion Date: 18-Aug-2025
• Ref Project: oSIST prEN ISO 8742:2025 - Fasteners - Grooved pins - One-third-length center grooves (ISO/DIS 8742:2025)

Relations

• Revises: EN ISO 8742:1997 - Grooved pins - One-third-length centre grooved (ISO 8742:1997)
• Effective Date: 05-Nov-2024

Overview

prEN ISO 8742 / ISO/DIS 8742:2025 defines the characteristics of grooved pins with one‑third‑length centre (oval) grooves. The draft standard covers pins in steel and stainless steel with nominal diameters from 1 mm to 25 mm. These grooved pins are intended primarily for accurate positioning, controlled relative rotation of assembled parts and provide a medium level of pull‑out resistance due to elastic fit behaviour.

The document is a product standard aligned with the general requirements and functional principles in ISO 13669. It is circulated as a draft international standard and is subject to change during the ISO/CEN parallel processing and voting period.

Key Topics

• Scope and purpose: Functional intent (positioning, rotation, guiding) and symmetric shape for easy installation.
• Materials: Steel and stainless steel (grades A1, A2, A4, C1, F1 are referenced). Other materials (e.g. hardened steels, brass, aluminium) can be agreed between purchaser and supplier.
• Dimensions and tolerances: Nominal diameters 1–25 mm; groove length equals l/3 with specified tolerances by length ranges (e.g. ±0.3 mm for l ≤ 10 mm up to ±1.5 mm for 100 mm < l ≤ 200 mm). Control of expanded diameter (d) and pin straightness (t) follows ISO 13669.
• Ends and finishing: Pins are manufactured with rounded ends by default (RN); chamfered ends (CH) available on request. Coating and surface conditions are addressed (electroplated, zinc flake, phosphate, passivation) with references to ISO 4042, ISO 10683 and ISO 9717.
• Inspection and acceptance: Acceptance inspection specified by ISO 3269; general requirements and terminology by ISO 13669 and ISO 1891-4.
• Updates: The current edition revises terms, groove tolerances, expanded diameter values (including stainless steel), additional stainless grades, and labelling requirements.

Applications

• Assembly locating and alignment in mechanical components
• Fastening where controlled rotation between parts is required
• Medium-retention dowel applications in fixtures and jigs
• Use in manufacturing, automotive, machinery and general engineering where standardized grooved pins improve interchangeability and quality control

Related Standards

• ISO 13669 - Fasteners - Grooved pins - General requirements (functional principles, control of expanded diameter and straightness)
• ISO 3269 - Acceptance inspection
• ISO 3506-6 - Selection of stainless steels for fasteners
• ISO 4042, ISO 10683, ISO 9717 - Surface treatments and coatings
• ISO 1891-4 - Vocabulary and lot identification

For procurement and implementation, refer to the full prEN ISO 8742 text and the referenced ISO standards. Manufacturers and users should agree any non-standard materials, finishes or dimensional variants at order placement.

Standards Content (Sample)

SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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)
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
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
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.
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 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
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
...