SIST EN ISO 8743:2026
(Main)Fasteners - Grooved pins - Half-length centre grooved (ISO 8743:2026)
- 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
- Public Enquiry End Date
- 08-Jul-2025
- Publication Date
- 18-Jun-2026
- 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
SIST EN ISO 8743:2026 is the CEN adoption of ISO 8743:2026 for grooved pins with half-length centre oval grooves (with closed ends). It specifies the characteristics of these pins in steel and stainless steel, with nominal diameters from 1 mm to 25 mm, for use in assemblies that need relative rotation, positioning or guiding. The document points the general principles for grooved pins and assembly to ISO 13669.
What does SIST EN ISO 8743:2026 specify?
SIST EN ISO 8743:2026 covers the geometry, materials, finish, labelling and designation of this grooved pin type. It is organized into Clauses 1 to 8, followed by a bibliography.
The main clauses cover:
- Scope
- Normative references
- Terms and definitions
- Principles of grooved pins and assembly
- Dimensions
- Requirements and reference International Standards
- Labelling on package
- Designation
This structure matters because the document combines product dimensions with the rules needed to specify, order, inspect and mark the pins correctly.
What are the key requirements of SIST EN ISO 8743:2026?
SIST EN ISO 8743:2026 ties the product definition to ISO 13669 and then gives the size and specification rules for this pin type. In practice, users need to check dimensions, material condition, surface condition and package information against the clauses and tables.
Dimensions and groove geometry
Clause 5 requires dimensions to follow Figure 1 and Tables 1 and 2. The pin diameter applies only where the grooves are not present, and the document gives tolerances for groove length, groove position and the 120° angle between the two grooves.
For users, this is the core sizing information for design and inspection. It tells manufacturers what to produce and buyers what to verify when matching the pin to a hole and assembly.
Ends, lengths and preferred sizes
SIST EN ISO 8743:2026 allows rounded ends by default and chamfered ends only when requested at the time of order. Tables 1 and 2 also identify preferred and non-preferred sizes, and the length ranges shown between the stepped bold lines define the standard lengths.
For practice, this affects ordering and stock control. If a design needs a non-preferred size or chamfered end, that has to be stated explicitly.
Materials, surface condition and acceptance
Clause 6 links the product to reference standards for steel, stainless steel, coatings and acceptance. Steel uses the symbol St, stainless steel uses grades such as A1, A2, A4, C1 and F1, and other materials may be agreed between purchaser and manufacturer.
The document also points to surface conditions such as as processed, clean and bright, passivated, electroplated coatings, phosphate coatings and zinc flake coatings. Workmanship requires pins to be free of burrs and detrimental defects, and acceptance inspection follows ISO 3269.
Labelling and designation
Clause 7 sets the minimum package labelling items, including ISO 8743, nominal diameter and length, RN or CH, material identification, surface condition, maker or distributor identification, lot number and quantity. Clause 8 gives the designation format and examples.
This matters for traceability and purchasing. A correct designation tells the supplier exactly which diameter, length, end form, material and finish to deliver.
What terms does SIST EN ISO 8743:2026 define?
- Grooved pin - A pin with grooves designed for use where parts must be held while allowing relative motion or positioning.
- RN - The code for a pin with rounded ends.
- CH - The code for a pin with chamfered ends.
- St - The symbol used for steel pins.
- d - The nominal diameter, used throughout the tables and designation.
- l - The nominal length, used together with d in the designation.
- A1, A2, A4, C1, F1 - Stainless steel grades named in the document for this product family.
Who uses SIST EN ISO 8743:2026?
SIST EN ISO 8743:2026 is used by fastener manufacturers, suppliers, purchasers, design engineers and quality or inspection teams. They use it to specify the pin size and end form, select a material and surface condition, label packages, and check acceptance against the listed standards.
It is relevant wherever grooved pins are used for assembly positioning, guiding or controlled rotation in mechanical products and equipment.
What changed in SIST EN ISO 8743:2026 from the previous edition?
SIST EN ISO 8743:2026 supersedes EN ISO 8743:1997 and is identified as a technically revised third edition. The changes named in the document are:
- general requirements, including principles, hole dimensions, expanded diameter control, straightness, properties and inspection, were moved to ISO 13669
- non-preferred diameters 1 mm, 3.5 mm, 7 mm, 9 mm, 14 mm and 18 mm were added
- expanded diameter values for steel were adjusted for the shortest length range and added for stainless steel
- tolerances for rounded ends and values for chamfered ends were added
- groove length and groove location tolerances were added
- stainless steel grades A2, A4, C1 and F1 were added
- specifications for labelling were added as Clause 7
Which standards are used with SIST EN ISO 8743:2026?
SIST EN ISO 8743:2026 refers to ISO 13669 for the general requirements and functional principles for grooved pins and assembly. It also refers to ISO 1891-4 for manufacturing lot numbering and quality-related vocabulary, ISO 3269 for acceptance inspection, ISO 3506-6 for stainless steel selection, ISO 4042 for electroplated coatings, ISO 9717 for phosphate coatings, and ISO 10683 for zinc flake coatings.
The bibliography also points to related grooved pin standards such as ISO 8739, ISO 8740, ISO 8741, ISO 8742, ISO 8744, ISO 8745, ISO 8746, ISO 8747, ISO 13670 and ISO 13672, which place this document within the wider grooved-pin family.
What does the SIST EN ISO 8743:2026 document contain?
SIST EN ISO 8743:2026 contains Figure 1, which shows the pin form and groove arrangement, and Tables 1 and 2, which give the dimensional data for the two diameter ranges. Those tables are the main engineering reference for design and inspection.
It also contains Table 3, which links material types, surface conditions and reference standards. That table is the practical bridge between the pin specification and coating, material selection and acceptance rules.
The designation clause includes worked examples showing how to build a product designation from diameter, length, end form, material and condition. That helps users write purchase descriptions and verify deliveries without ambiguity.
Relations
- Effective Date
- 05-Nov-2024
Frequently Asked Questions
SIST EN ISO 8743:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Fasteners - Grooved pins - Half-length centre grooved (ISO 8743:2026)". 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.
SIST EN 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.
SIST EN ISO 8743:2026 has the following relationships with other standards: It is inter standard links to SIST EN ISO 8743:2001. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 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)
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
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Phone: +41 22 749 01 11
Email: copyright@iso.org
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,
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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.
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related to conformity assessment, as well as information about ISO's adherence to the World Trade
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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
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