EN ISO 3964-1:2026

Dentistry - Coupling dimensions for handpiece connectors - Part 1: Mechanical properties (ISO 3964-1:2026)

This document specifies coupling between handpieces and motors that are connected to dental units. For the purposes of this document, the couplings described in this document are not equipped with electronic terminal(s).
This document specifies the nominal dimensions, tolerances and extraction force of coupling systems for use between handpieces and motor which supply the handpiece with water, air and light and rotation energy.

Zahnheilkunde - Kupplungsmaße für Handstückverbindungen - Teil 1: Mechanische Eigenschaften (ISO 3964-1:2026)

Médecine bucco-dentaire - Dimensions d'accouplement pour pièces à main dentaires - Partie 1: Propriétés mécaniques (ISO 3964-1:2026)

Le présent document spécifie le couplage entre les pièces à main et les moteurs qui sont raccordés aux units dentaires. Pour les besoins du présent document, les couplages décrits dans le présent document ne sont pas équipés de borne(s) électronique(s).
Le présent document spécifie les dimensions nominales, les tolérances et la force d’extraction des systèmes d’accouplement utilisés entre les pièces à main et le moteur qui alimentent la pièce à main en eau, air et lumière et en énergie de rotation.

Zobozdravstvo - Mere sklopov za priključke ročnih instrumentov - 1. del: Mehanske lastnosti (ISO 3964-1:2026)

Ta dokument določa sklopke med ročniki in motorji, ki so povezani z zobozdravstvenimi enotami. Za namene tega dokumenta sklopke, opisane v tem dokumentu, niso opremljene z elektronskim priključkom.
Ta dokument določa nazivno dimenzijo, tolerance in izvlečno silo sklopnih sistemov za uporabo med ročniki in motorji, ki ročniku zagotavljajo vodo, zrak, svetlobo in rotacijsko energijo.

General Information

• Status: Published
• Publication Date: 09-Jun-2026
• ICS: 11.060.25 - Dental instruments
• Technical Committee: CEN/TC 55 - Dentistry
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 10-Jun-2026
• Completion Date: 10-Jun-2026
• Ref Project: SIST EN ISO 3964-1:2026 - Dentistry - Coupling dimensions for handpiece connectors - Part 1: Mechanical properties (ISO 3964-1:2026)

Relations

• Replaces: EN ISO 3964:2016 - Dentistry - Coupling dimensions for handpiece connectors (ISO 3964:2016)
• Effective Date: 02-Aug-2023
• Replaces: EN ISO 3964:2016/A1:2019 - Dentistry - Coupling dimensions for handpiece connectors - Amendment 1: Interface dimensions (ISO 3964:2016/Amd 1:2018)
• Effective Date: 02-Aug-2023
• Consolidated By: ISO 3964-1:2026 - Dentistry — Coupling dimensions for handpiece connectors — Part 1: Mechanical properties
• Effective Date: 12-Feb-2026

Overview

EN ISO 3964-1:2026 - Dentistry – Coupling dimensions for handpiece connectors – Part 1: Mechanical properties is a European and International Standard developed by CEN and ISO. This standard focuses on the mechanical properties and dimensional requirements for the couplings between dental handpieces and motors, crucial components in dental units. Specifically, EN ISO 3964-1:2026 applies to coupling systems that are not equipped with electronic terminals and are intended to provide water, air, light, and rotational energy to handpieces.

By specifying nominal dimensions, tolerances, and extraction forces, the standard ensures compatibility and reliable performance between dental handpieces and motors, contributing to safer and more efficient dental procedures.

Key Topics

• Scope of Standardization
  • Applies to mechanical couplings between handpieces and motors in dental units without electronic terminals
  • Covers nominal dimensions, dimensional tolerances, and extraction force requirements
• Classification of Coupling Types
  • Four main coupling types based on provision of water, air, and light supplies:
    • Without internal spray and without light
    • With internal spray, without light
    • With internal spray and with light
    • Without internal spray, with light
• Dimensional Requirements
  • Defines critical linear and angular measurements for both handpiece and motor sides
  • Specifies multiple standardized lengths (long, middle, short, extra short) for adaptability to different dental setups
  • Requires edges to be burr-free or rounded for safety and hygiene
  • Refers to ISO 2768-1 and ISO 2768-2 for general tolerances
• Mechanical Extraction Force
  • Mandates a minimum extraction (pull-off) force of 30 N for safety and functional integrity
  • Permits alternate designs provided equivalent functional safety is achieved
• Testing Methods
  • Specifies measurement precision for dimension and extraction force verification
  • Requires adherence to manufacturer’s instructions and sterilization guidelines during testing

Applications

EN ISO 3964-1:2026 holds significant practical value in the dental equipment industry, directly impacting manufacturers, suppliers, regulators, and dental professionals:

• Manufacturers and Suppliers

  • Enables the design and production of standardized, interchangeable dental handpieces and motors
  • Reduces risks associated with misfit or unreliable coupling connections

• Dental Practices

  • Facilitates smooth integration and replacement of dental tools across different brands and models
  • Contributes to patient safety by minimizing connection failures during procedures

• Regulators and Quality Assurance

  • Assists in the evaluation and certification of dental equipment for conformity to international safety and compatibility standards
  • Streamlines market surveillance by providing clear technical criteria

Related Standards

• EN ISO 3964-2
  Dentistry – Coupling dimensions for handpiece connectors – Part 2: Electrical connectors (covers coupling systems equipped with electronic terminals)

• ISO 14457
  Dentistry – Handpieces and motors (provides additional requirements for dental handpieces and motors)

• ISO 1942
  Dentistry – Vocabulary (ensures consistency in terminology)

• ISO 2768-1 & ISO 2768-2
  General tolerances for linear, angular, and geometrical dimensions, referenced for all unspecified tolerances in EN ISO 3964-1

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In summary, EN ISO 3964-1:2026 is essential for ensuring the interoperability, mechanical integrity, and safety of handpiece connectors in dental units. By following this standard, dental device manufacturers and users can enhance product compatibility, streamline installations, and uphold international quality standards in dental care environments.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2026
Nadomešča:
SIST EN ISO 3964:2017
SIST EN ISO 3964:2017/A1:2019
Zobozdravstvo - Priključne mere za priključke za vrteče se zobne pripomočke - 1.
del: Mehanske lastnosti (ISO 3964-1:2026)
Dentistry - Coupling dimensions for handpiece connectors - Part 1: Mechanical
properties (ISO 3964-1:2026)
Zahnheilkunde - Kupplungsmaße für Handstückverbindungen - Teil 1: Mechanische
Eigenschaften (ISO 3964-1:2026)
Médecine bucco-dentaire - Dimensions d'accouplement pour pièces à main dentaires -
Partie 1: Propriétés mécaniques (ISO 3964-1:2026)
Ta slovenski standard je istoveten z: EN ISO 3964-1:2026
ICS:
11.060.20 Zobotehnična oprema Dental equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 3964-1
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2026
EUROPÄISCHE NORM
ICS 11.060.25 Supersedes EN ISO 3964:2016, EN ISO
3964:2016/A1:2019
English Version
Dentistry - Coupling dimensions for handpiece connectors
- Part 1: Mechanical properties (ISO 3964-1:2026)
Médecine bucco-dentaire - Dimensions d'accouplement Zahnheilkunde - Kupplungsmaße für
pour pièces à main dentaires - Partie 1: Propriétés Handstückverbindungen - Teil 1: Mechanische
mécaniques (ISO 3964-1:2026) Eigenschaften (ISO 3964-1:2026)
This European Standard was approved by CEN on 10 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 3964-1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 3964-1:2026) has been prepared by Technical Committee ISO/TC 106
"Dentistry" in collaboration with Technical Committee CEN/TC 55 “Dentistry” the secretariat of which
is held by DIN.
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 3964:2016.
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 3964-1:2026 has been approved by CEN as EN ISO 3964-1:2026 without any
modification.
International
Standard
ISO 3964-1
First edition
Dentistry — Coupling dimensions
2026-06
for handpiece connectors —
Part 1:
Mechanical properties
Médecine bucco-dentaire — Dimensions d'accouplement pour
pièces à main dentaires —
Partie 1: Propriétés mécaniques
Reference number
ISO 3964-1:2026(en) © ISO 2026

ISO 3964-1:2026(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
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 3964-1:2026(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification according to the supply of water, air and light . 2
5 Requirements . 2
5.1 General .2
5.2 Dimensions .2
5.3 Coupling force . .16
6 Sampling . 16
7 Test methods .16
7.1 Dimensions .16
7.2 Coupling force .16

iii
ISO 3964-1:2026(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,
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 106, Dentistry, Subcommittee SC 4, Dental
instruments, in collaboration with the European Committee for Standardization (CEN) Technical Committee
CEN/TC 55, Dentistry, in accordance with the Agreement on technical cooperation between ISO and CEN
(Vienna Agreement).
This first edition cancels and replaces ISO 3964:2016, which has been technically revised. It also incorporates
the Amendment ISO 3964:2016/Amd 1:2018.
The main changes are as follows:
— the technical drawings have been improved;
— new dimensions and optional figures have been added.
A list of all parts in the ISO 3964 series can be found on the ISO website.
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 3964-1:2026(en)
Dentistry — Coupling dimensions for handpiece
connectors —
Part 1:
Mechanical properties
1 Scope
This document specifies coupling between handpieces and motors that are connected to dental units. For
the purposes of this document, the couplings described in this document are not equipped with electronic
terminal(s).
This document specifies the nominal dimensions, tolerances and extraction force of coupling systems for use
between handpieces and motor which supply the handpiece with water, air and light and rotation energy.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cite
...