SIST 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
• Public Enquiry End Date: 29-Jun-2025
• Publication Date: 29-Jun-2026
• ICS: 11.060.20 - Dental equipment
• ICS: 11.060.25 - Dental instruments
• Technical Committee: VAZ - Healthcare
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 19-Jun-2026
• Due Date: 24-Aug-2026
• Completion Date: 30-Jun-2026
• Ref Project: EN ISO 3964-1:2026 - Dentistry - Coupling dimensions for handpiece connectors - Part 1: Mechanical properties (ISO 3964-1:2026)

Relations

• Replaces: SIST EN ISO 3964:2017 - Dentistry - Coupling dimensions for handpiece connectors (ISO 3964:2016)
• Effective Date: 01-Sep-2026
• Replaces: SIST EN ISO 3964:2017/A1:2019 - Dentistry - Coupling dimensions for handpiece connectors - Amendment 1: Interface dimensions (ISO 3964:2016/Amd 1:2018)
• Effective Date: 01-Sep-2026

Overview

SIST EN ISO 3964-1:2026 outlines standardized coupling dimensions and mechanical properties for connectors used between dental handpieces and motors in dental units. Developed by the Slovenski inštitut za standardizacijo (SIST), this standard applies specifically to couplings not equipped with electronic terminals. The aim is to ensure compatibility, safety, and reliability in delivering water, air, light, and rotational energy to dental handpieces.

The standard specifies:

• Nominal dimensions and tolerances for coupling systems
• Minimum extraction force required for handpiece-motor connections
• Mechanical properties to facilitate effective operation in dental environments

ISO 3964-1:2026 is essential for manufacturers, dental equipment suppliers, and dental clinics seeking to ensure that connectors work seamlessly and comply with international safety and interoperability requirements.

Key Topics

• Scope and Applicability: Covers only mechanical connectors, excluding designs with electronic terminals.
• Coupling Types: Classification based on the supply of water, air, and light; includes couplings with and without internal sprays and light supply.
• Dimensional Requirements: Specifies various nominal lengths, diameters, and tolerances for different handpiece-motor coupling types.
• Mechanical Integrity:
  • Minimum required extraction force (at least 30 N) to disconnect handpiece from the motor.
  • Guidelines for burr-free and rounded edges to ensure safety and compatibility.
• Testing Procedures:
  • Dimensional measurements to verify compliance
  • Extraction force testing to confirm mechanical security
• Referencing International Standards:
  • Incorporates terminology and measurement standards (e.g., ISO 1942, ISO 2768-1/-2, ISO 14457).

Applications

The ISO 3964-1:2026 standard delivers practical value within the field of dental equipment manufacturing, installation, and maintenance:

• Dental Equipment Manufacturers: Ensures uniformity in dental handpiece connector design, reducing compatibility issues and facilitating global market access.
• Dental Clinics and Service Providers: Supports easy interchangeability of handpieces and motors from different suppliers, enhancing operational flexibility and maintenance efficiency.
• Procurement and Regulatory Compliance: Assists dental unit purchasers in specifying equipment that adheres to recognized international standards, ensuring patient safety and equipment longevity.
• Maintenance and Servicing: Standardized couplings streamline servicing, sterilization, and parts replacement, leading to less downtime and improved cost efficiency.
• Quality Assurance: Provides a reliable framework for testing and verifying the mechanical performance of connector systems used in dental settings.

Related Standards

Professionals working with dental handpiece couplings should also be familiar with:

• ISO 3964-2: Dentistry - Coupling dimensions for handpiece connectors - Part 2: Electrical connectors (for connectors equipped with electronic terminals).
• ISO 14457: Dentistry - Handpieces and motors (general requirements and test methods for dental rotary instruments).
• ISO 1942: Dentistry - Vocabulary (definitions critical for consistent interpretation).
• ISO 2768-1/-2: General tolerances - Parts 1 and 2 (guidelines for linear, angular, and geometrical tolerances in engineering drawings).

By adhering to SIST EN ISO 3964-1:2026, dental industry stakeholders promote equipment safety, compatibility, and international interoperability, supporting the efficient delivery of dental care worldwide.

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
...