ISO 3764:2016
(Main)Timekeeping instruments — Movements — Types, dimensions and nomenclature
Timekeeping instruments — Movements — Types, dimensions and nomenclature
ISO 3764:2016 specifies the types and fitting dimensions of mechanical and electromechanical watch-movements. This International Standard is applicable to the five following types of movements: - Type 1: round; - Type 2: shaped round; - Type 3: round with double cutting; - Type 4: 5 ½′′′; - Type 5: 6 × 8′′′.
Instruments horaires — Mouvements — Formes, dimensions et nomenclature
ISO 3764:2016 fixe les formes et dimensions d'encageage des mouvements de montres mécaniques et électromécaniques. La présente Norme internationale s'applique aux cinq types suivants de mouvements: - Type 1: rond; - Type 2: rond coupé; - Type 3: rond avec double coupe; - Type 4: 5 ½′′′; - Type 5: 6 × 8′′′.
General Information
- Status
- Published
- Publication Date
- 06-Mar-2016
- Technical Committee
- ISO/TC 114/SC 7 - Overall dimensions
- Drafting Committee
- ISO/TC 114/SC 7 - Overall dimensions
- Current Stage
- 9093 - International Standard confirmed
- Start Date
- 07-Jun-2021
- Completion Date
- 14-Feb-2026
Relations
- Effective Date
- 25-Jun-2011
Overview
ISO 3764:2016 - Timekeeping instruments - Movements - Types, dimensions and nomenclature defines standard types, dimensional definitions and nomenclature for mechanical and electromechanical watch movements. The standard establishes how to specify casing and outer diameters, movement thicknesses (including battery and clamp where applicable), and names five common movement formats used in watchmaking: Type 1 (round), Type 2 (shaped round), Type 3 (round with double cutting), Type 4 (5 ½''' movement) and Type 5 (6 ¾ × 8''' movement). ISO 3764 supports consistent specification, interchangeability and quality control across the horology supply chain.
Key technical topics and requirements
- Movement types and geometry: Defines the five movement types and the relevant dimensional features (width, fitting length, overall length, oval radii, flat/circular segments) used for design and case-fitting.
- Diameters: Introduces casing diameter (d1) - the diameter by which a movement is located in the case - and outer diameter (d2) - the largest flange diameter. Provisions include guidance on protrusions and how they are treated.
- Thickness nomenclature: Specifies total thickness measures for mechanical movements (l1) and electromechanical movements:
- l1 = thickness without battery,
- l2 = thickness with battery,
- l3 = thickness including battery fastening clamp.
- Tolerances and materials: Dimension tables in the standard list nominal sizes and indicate that tolerances (e.g., h8, h9) apply to metallic movements; reference is made to ISO 286‑1 for the system of limits and fits.
- Nomenclature and drawings: Standardized figure keys and table formats for clear communication between designers, manufacturers and inspectors.
Practical applications and users
ISO 3764 is used to:
- Ensure interchangeability of movements and cases between manufacturers and suppliers.
- Define technical specifications for movement procurement, tooling and case design.
- Support quality control, inspection and acceptance testing in production.
- Provide a common vocabulary for technical documentation, CAD models and repair manuals.
Typical users:
- Watch manufacturers and movement designers
- Case makers and component suppliers
- Repair and aftermarket service organizations
- Technical writers, procurement specialists and standards teams in horology
Related standards
- ISO 286‑1 - System of limits and fits (basis for tolerance classes mentioned in ISO 3764)
- ISO 6426‑2 - Horological vocabulary - technico‑commercial definitions
- Work prepared under ISO/TC 114 (Horology)
ISO 3764:2016 is a practical reference for anyone specifying, producing or certifying watch movements and cases, enabling clear dimensional communication and reliable fit across the horology industry. Keywords: ISO 3764, watch movements, movement dimensions, timekeeping instruments, horology standards, casing diameter, movement thickness.
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ISO 3764:2016 - Timekeeping instruments -- Movements -- Types, dimensions and nomenclature
ISO 3764:2016 - Instruments horaires -- Mouvements -- Formes, dimensions et nomenclature
Frequently Asked Questions
ISO 3764:2016 is a standard published by the International Organization for Standardization (ISO). Its full title is "Timekeeping instruments — Movements — Types, dimensions and nomenclature". This standard covers: ISO 3764:2016 specifies the types and fitting dimensions of mechanical and electromechanical watch-movements. This International Standard is applicable to the five following types of movements: - Type 1: round; - Type 2: shaped round; - Type 3: round with double cutting; - Type 4: 5 ½′′′; - Type 5: 6 × 8′′′.
ISO 3764:2016 specifies the types and fitting dimensions of mechanical and electromechanical watch-movements. This International Standard is applicable to the five following types of movements: - Type 1: round; - Type 2: shaped round; - Type 3: round with double cutting; - Type 4: 5 ½′′′; - Type 5: 6 × 8′′′.
ISO 3764:2016 is classified under the following ICS (International Classification for Standards) categories: 39.040.10 - Watches. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 3764:2016 has the following relationships with other standards: It is inter standard links to ISO 3764:2000. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 3764:2016 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)
INTERNATIONAL ISO
STANDARD 3764
Fourth edition
2016-03-01
Timekeeping instruments —
Movements — Types, dimensions and
nomenclature
Instruments horaires — Mouvements — Formes, dimensions et
nomenclature
Reference number
©
ISO 2016
© 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
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Diameters of movements . 1
3.2 Thickness of movements . 2
3.2.1 Mechanical type . 2
3.2.2 Electromechanical type . 2
4 Nomenclature of movements and their dimensions . 2
4.1 Type 1: Round movement . . 2
4.2 Type 2: Shaped round movement . 4
4.3 Type 3: Round movement with double cutting . 5
4.4 Type 4: 5 ½′′′movement . 6
4.5 Type 5: 6 ¾ × 8′′′movement . 7
5 Nomenclature for thickness of movements . 8
5.1 Mechanical movements . 8
5.2 Electromechanical movements with analogue display . 8
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. 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. 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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT), see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 114, Horology, Subcommittee SC 7, Overall
dimensions.
This fourth edition cancels and replaces the third edition (ISO 3764:2000), which has been technically
revised.
iv © ISO 2016 – All rights reserved
INTERNATIONAL STANDARD ISO 3764:2016(E)
Timekeeping instruments — Movements — Types,
dimensions and nomenclature
1 Scope
This International Standard specifies the types and fitting dimensions of mechanical and
electromechanical watch-movements.
This Intern
...
NORME ISO
INTERNATIONALE 3764
Quatrième édition
2016-03-01
Instruments horaires — Mouvements
— Formes, dimensions et
nomenclature
Timekeeping instruments — Movements — Types, dimensions and
nomenclature
Numéro de référence
©
ISO 2016
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2016, Publié en Suisse
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni utilisée
sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie, l’affichage sur
l’internet ou sur un Intranet, sans autorisation écrite préalable. Les demandes d’autorisation peuvent être adressées à l’ISO à
l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – Tous droits réservés
Sommaire Page
Avant-propos .iv
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 1
3.1 Diamètres des mouvements . 1
3.2 Épaisseurs des mouvements . 2
3.2.1 Type mécanique . 2
3.2.2 Type électromécanique . 2
4 Nomenclature des mouvements et leurs dimensions . 2
4.1 Type 1: Mouvement rond . 2
4.2 Type 2: Mouvement rond coupé . 4
4.3 Type 3: Mouvement rond avec double coupe . 5
4.4 Type 4: Mouvement 5 ½′′′. 6
4.5 Type 5: Mouvement 6 ¾ × 8′′′ . 7
5 Nomenclature des épaisseurs de mouvements . 8
5.1 Mouvements mécaniques . 8
5.2 Mouvements électromécaniques à affichage analogique . 8
Avant-propos
L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes
nationaux de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est
en général confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude
a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,
gouvernementales et non gouvernementales, en liaison avec l’ISO participent également aux travaux.
L’ISO collabore étroitement avec la Commission électrotechnique internationale (IEC) en ce qui
concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier de prendre note des différents
critères d’approbation requis pour les différents types de documents ISO. Le présent document a été
rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2, www.iso.
org/directives.
L’attention est appelée sur le fait que certains des éléments du présent document peuvent faire l’objet de
droits de propriété intellectuelle ou de droits analogues. L’ISO ne saurait être tenue pour responsable
de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant
les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de
l’élaboration du document sont indiqués dans l’Introduction et/ou sur la liste ISO des déclarations de
brevets reçues, www.iso.org/patents.
Les éventuelles appellations commerciales utilisées dans le présent document sont données pour
information à l’intention des utilisateurs et ne constituent pas une approbation ou une recommandation.
Le comité chargé de l’élaboration du présent document est l’ISO/TC 114, Horlogerie, sous-comité SC 7,
Dimensions de raccordement.
Cette quatrième édition annule et remplace la troisième édition (ISO 3764:2000), qui a fait l’objet d’une
révision technique.
iv © ISO 2016 – Tous droits réservés
NORME INTERNATIONALE ISO 3764:2016(F)
Instruments horaires — Mouvements — Formes,
dimensions et nomenclature
1 Domaine d’application
La présente Norme internationale fixe les formes et dimensions d’encageage des mouvements de
montres mécaniques et électromécaniques.
La présente Norme internationale s’applique aux cinq types suivants de mouvements:
— Type 1: rond;
— Type 2: rond coupé;
— Type 3: rond avec double coupe;
— Type 4: 5 ½′′′;
— Type 5: 6 ¾ × 8′′′.
2 Références normatives
Les docum
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