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 - Priključne mere za priključke za vrteče se zobne pripomočke - 1. del: Mehanske lastnosti (ISO/FDIS 3964-1:2026)

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: kSIST FprEN ISO 3964-1:2026 - Dentistry - Coupling dimensions for handpiece connectors - Part 1: Mechanical properties (ISO/FDIS 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

---

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
oSIST prEN ISO 3964-1:2025
01-junij-2025
Zobozdravstvo - Priključne mere za priključke za vrteče se zobne pripomočke - 1.
del: Mehanske lastnosti (ISO/DIS 3964-1:2025)
Dentistry - Coupling dimensions for handpiece connectors - Part 1: Mechanical
properties (ISO/DIS 3964-1:2025)
Zahnheilkunde - Kupplungsmaße für Handstückverbindungen - Teil 1: Mechanische
Eigenschaften (ISO/DIS 3964-1:2025)
Médecine bucco-dentaire - Dimensions d'accouplement pour pièces à main dentaires -
Partie 1: Propriétés mécaniques (ISO/DIS 3964-1:2025)
Ta slovenski standard je istoveten z: prEN ISO 3964-1
ICS:
11.060.20 Zobotehnična oprema Dental equipment
oSIST prEN ISO 3964-1:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 3964-1:2025
oSIST prEN ISO 3964-1:2025
DRAFT
International
Standard
ISO/DIS 3964-1
ISO/TC 106/SC 4
Dentistry — Coupling dimensions
Secretariat: DIN
for handpiece connectors —
Voting begins on:
Part 1: 2025-04-21
Mechanical properties
Voting terminates on:
2025-07-14
ICS: 11.060.25
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 3964-1:2025(en)
oSIST prEN ISO 3964-1:2025
DRAFT
ISO/DIS 3964-1:2025(en)
International
Standard
ISO/DIS 3964-1
ISO/TC 106/SC 4
Dentistry — Coupling dimensions
Secretariat: DIN
for handpiece connectors —
Voting begins on:
Part 1:
Mechanical properties
Voting terminates on:
ICS: 11.060.25
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 3964-1:2025(en)
ii
oSIST prEN ISO 3964-1:2025
ISO/DIS 3964-1:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 2
4.1 According to the water, air and light supply .2
5 Requirements . 2
5.1 General .2
5.2 Dimensions .2
5.3 Coupling force . .14
6 Sampling . 14
7 Test methods . 14
7.1 Dimensions .14
7.2 Coupling force .14

iii
oSIST prEN ISO 3964-1:2025
ISO/DIS 3964-1:2025(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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
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.
This first edition cancels and replaces the part of the edition (ISO 3964:2016 + Amd 1:2018), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— improved technical drawings for better visualization
— addition of new dimensions and optional figures
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
oSIST prEN ISO 3964-1:2025
ISO/DIS 3964-1:2025(en)
Introduction
ISO 3964 was divided to two documents to consider another type of connector, which is equipped with
electrical terminal(s) as below;
— Dentistry - Coupling dimensions for handpiece connectors - Part 1: Mechanical properties,
1)
— Dentistry - Coupling dimensions for handpiece connectors - Part 2: Electrical connectors .
1) To be prepared by ISO/TC 106/SC 4.

v
oSIST prEN ISO 3964-1:2025
oSIST prEN ISO 3964-1:2025
DRAFT International Standard ISO/DIS 3964-1:2025(en)
Dentistry — Coupling dimensions for handpiece
connectors —
Part 1:
Mechanical properties
1 Scope
This document specifies the coupling between handpieces and motors, which is not equipped with electronic
terminal(s), connected to dental units.
This document specifies the nominal dimensions, tolerances, and the extraction force of coupling systems for
use between handpiece 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 cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 1942, Dentistry — Vocabulary
ISO 2768-1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual
tolerance indications
ISO 2768-2, General tolerances — Part 2: Geometrical tolerances for features without individual tolerance
indications
ISO 14457, Dentistry — Handpieces and motors
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1942, ISO 14457 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
coupling dimension
descripti
...