EN ISO 3964:2016

Dentistry - Coupling dimensions for handpiece connectors (ISO 3964:2016)

ISO 3964:2016 specifies the coupling between handpieces and motors connected to dental units.
ISO 3964:2016 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.

Zahnheilkunde - Kupplungsmaße für Handstückverbindungen (ISO 3964:2016)

Médecine bucco-dentaire - Dimensions d'accouplement pour pièces à main dentaires (ISO 3964:2016)

ISO 3964:2016 spécifie l'accouplement entre les pièces à main et les moteurs connectés aux units dentaires.
ISO 3964:2016 spécifie les dimensions nominales, les tolérances et la force d'extraction des systèmes d'accouplement utilisés entre la pièce à main et le moteur qui lui fournissent l'eau, l'air, la lumière et l'énergie de rotation.

Zobozdravstvo - Priključne mere za priključke za vrteče se zobne pripomočke (ISO 3964:2016)

Ta mednarodni standard določa priključke med vrtečimi se zobnimi pripomočki in motorji, ki so povezani z dentalnimi enotami.
Ta mednarodni standard določa nominalne mere, odstopanja in ekstrakcijsko silo priključnih sistemov za uporabo med vrtečim se zobnim pripomočkom in motorjem, ki zobni pripomoček oskrbuje z vodo, zrakom, svetlobo in rotacijsko energijo.

General Information

• Status: Published
• Publication Date: 29-Nov-2016
• Withdrawal Date: 30-May-2017
• ICS: 11.060.20 - Dental equipment
• ICS: 11.060.25 - Dental instruments
• Technical Committee: CEN/TC 55 - Dentistry
• Drafting Committee: CEN/TC 55 - Dentistry
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 30-Nov-2016
• Completion Date: 30-Nov-2016
• Ref Project: SIST EN ISO 3964:2017 - Dentistry - Coupling dimensions for handpiece connectors (ISO 3964:2016)

Relations

• Replaces: EN 23964:1989/AC1:1990 - Dentistry - Dental handpieces - Coupling dimensions (ISO 3964:1982)
• Effective Date: 07-Dec-2016
• Replaces: EN 23964:1989 - Dentistry - Dental handpieces - Coupling dimensions (ISO 3964:1982)
• Effective Date: 07-Dec-2016
• Amended By: EN ISO 3964:2016/A1:2019 - Dentistry - Coupling dimensions for handpiece connectors - Amendment 1: Interface dimensions (ISO 3964:2016/Amd 1:2018)
• Effective Date: 19-Jul-2017
• Revised: prEN ISO 3964-1 - Dentistry - Coupling dimensions for handpiece connectors - Part 1: Mechanical properties (ISO/DIS 3964-1:2025)
• Effective Date: 02-Aug-2023

Overview

EN ISO 3964:2016 (ISO 3964:2016) defines the coupling dimensions and performance requirements for connectors between dental handpieces and motors on dental units. The standard specifies nominal dimensions, tolerances and the extraction (uncoupling) force for coupling systems that convey rotation energy and supply air, water (spray) and light to handpieces.

Key topics and technical requirements

• Scope: Couplings between straight/angled handpieces and motors; includes internal/external spray and light supply variants.
• Classification: Four types
  • Type 1: no internal spray, no light
  • Type 2: internal spray, no light
  • Type 3: internal spray with light
  • Type 4: light, no internal spray
• Coupling dimensions: Nominal dimensions and tolerances illustrated in figures and summarized in Table 1. Important values:
  • Motor coupling dimension X (max): Long 31.8 mm, Middle 24.8 mm, Short 22.8 mm, Extra short 18.8 mm
  • Handpiece coupling dimension X (min): Long 32 mm, Middle 25 mm, Short 23 mm, Extra short 19 mm
• Mechanical features:
  • Grooves and sealing-ring geometry as provided by the manufacturer
  • Edges shall be burr-free or rounded
  • Alternative locking designs permitted; manufacturer must indicate handpiece length type in instructions for use
• Coupling (extraction) force: Minimum extraction force to disconnect a connected handpiece is ≥ 30 N, or the motor design must allow release of cooling-air pressure
• Sampling and tests:
  • One representative sample per coupling type for testing
  • Dimension measurement accuracy: ±0.01 mm for linear dimensions, ±1° for angles
  • Coupling force measurement accuracy: ±0.5 N
• Normative references include ISO 1942, ISO 14457, ISO 2768‑1 and ISO 2768‑2

Applications and users

• Who uses this standard:
  • Dental device manufacturers (handpieces, motors, couplings)
  • Dental equipment designers and test laboratories
  • Regulatory and quality departments responsible for product compliance
  • Purchasing/specification teams for dental clinics and OEM partners
• Practical uses:
  • Ensuring interchangeability and safe mechanical connection between handpieces and motors
  • Designing connector interfaces that meet dimensional/tolerance and extraction-force requirements
  • Performing acceptance and conformity testing during product development and quality control

Related standards

• ISO 14457 - Dentistry: Handpieces and motors
• ISO 1942 - Dentistry: Vocabulary
• ISO 2768-1 / ISO 2768-2 - General tolerances
• Supersedes EN 23964:1989

Keywords: EN ISO 3964:2016, ISO 3964:2016, dental handpiece coupling, handpiece connectors, coupling dimensions, dental motors, coupling force.

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2017
1DGRPHãþD
SIST EN 23964:2000
SIST EN 23964:2000/AC1:2003
=RER]GUDYVWYR3ULNOMXþQHPHUH]DSULNOMXþNH]DYUWHþHVH]REQHSULSRPRþNH,62

Dentistry - Coupling dimensions for handpiece connectors (ISO 3964:2016)
Zahnheilkunde - Anschlussmaße für Handstückkupplungen (ISO 3964:2016)
Médecine bucco-dentaire - Dimensions d'accouplement pour pièces à main dentaires
(ISO 3964:2016)
Ta slovenski standard je istoveten z: EN ISO 3964:2016
ICS:
11.060.20 =RERWHKQLþQDRSUHPD Dental equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 3964
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2016
EUROPÄISCHE NORM
ICS 11.060.25 Supersedes EN 23964:1989
English Version
Dentistry - Coupling dimensions for handpiece connectors
(ISO 3964:2016)
Médecine bucco-dentaire - Dimensions d'accouplement Zahnheilkunde - Kupplungsmaße für
pour pièces à main dentaires (ISO 3964:2016) Handstückverbindungen (ISO 3964:2016)
This European Standard was approved by CEN on 7 August 2016.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3964:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 3964:2016) 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 May 2017, and conflicting national standards shall be
withdrawn at the latest by May 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN 23964:1989.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 3964:2016 has been approved by CEN as EN ISO 3964:2016 without any modification.
INTERNATIONAL ISO
STANDARD 3964
Third edition
2016-11-01
Dentistry — Coupling dimensions for
handpiece connectors
Médecine bucco-dentaire — Dimensions d’accouplement pour pièces
à main dentaires
Reference number
ISO 3964:2016(E)
©
ISO 2016
ISO 3964:2016(E)
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
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ii © ISO 2016 – All rights reserved

ISO 3964:2016(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 1
5 Requirements . 2
5.1 General . 2
5.2 Dimensions . 2
5.3 Coupling force .10
6 Sampling .10
7 Test methods .10
7.1 Dimensions .10
7.2 Coupling force .11
ISO 3964:2016(E)
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
electro
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