SIST EN ISO 5211:2026

Industrial valves - Part-turn actuator attachments (ISO 5211:2026)

This document specifies requirements for the attachment of part-turn actuators, with or without gearboxes, to industrial valves.
The attachment of part-turn actuators to control valves in accordance with the requirements of this document is subject to an agreement between the supplier and the purchaser.
This document specifies:
flange dimensions necessary for the attachment of part-turn actuators to industrial valves [see Figures 1 a) and 1 c)] or to intermediate supports [see Figures 1 b) and 1 d)];
driving component dimensions of part-turn actuators necessary to attach them to the driven components;
reference values for torques for interfaces and for couplings having the dimensions specified in this document.
The attachment of the intermediate support to the valve is beyond the scope of this document.

Industriearmaturen - Anschlüsse von Schwenkantrieben (ISO 5211:2026)

Robinetterie industrielle - Raccordement des actionneurs à fraction de tour (ISO 5211:2026)

Le présent document spécifie les exigences pour le raccordement des actionneurs à fraction de tour, avec ou sans réducteur, aux appareils de robinetterie industrielle.
Le raccordement des actionneurs à fraction de tour aux robinets de régulation conformément aux spécifications du présent document est soumis à accord entre le fournisseur et l'acheteur.
Le présent document spécifie:
les dimensions des brides nécessaires pour le raccordement des actionneurs à fraction de tour aux appareils de robinetterie industrielle [voir Figures 1 a) et 1 c)] ou aux supports intermédiaires [voir Figures 1 b) et 1 d)];
les dimensions des éléments d'entraînement des actionneurs à fraction de tour nécessaires pour les raccorder aux éléments entraînés;
les valeurs de référence des couples pour les interfaces et les éléments d'accouplement dont les dimensions sont spécifiées dans le présent document.
Le raccordement du support intermédiaire à l'appareil de robinetterie est en dehors du domaine d'application du présent document.

Industrijski ventili - Priključki zasučnih pogonov na ventilih (ISO 5211:2026)

Ta dokument določa zahteve za pritrditev delno vrtljivih aktuatorjev, z ali brez zobniških prenosov, na industrijske ventile.
Pritrditev delno vrtljivih aktuatorjev na regulacijske ventile v skladu z zahtevami tega dokumenta je predmet dogovora med dobaviteljem in kupcem.
Ta dokument določa:
- dimenzije prirobnic, potrebne za pritrditev delno vrtljivih aktuatorjev na industrijske ventile [glej Sliki 1 a) in 1 c)] ali na vmesne nosilce [glej Sliki 1 b) in 1 d)];
- dimenzije pogonskih komponent delno vrtljivih aktuatorjev, potrebne za njihovo pritrditev na poganjane komponente;
- referenčne vrednosti za navor za vmesnike in za sklopke z dimenzijami, določenimi v tem dokumentu.
Pritrditev vmesnega nosilca na ventil ni zajeta v obseg tega dokumenta.

General Information

• Status: Published
• Public Enquiry End Date: 02-May-2025
• Publication Date: 13-Apr-2026
• ICS: 23.060.01 - Valves in general
• Technical Committee: TLP - Pressure vessels
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 27-Mar-2026
• Due Date: 01-Jun-2026
• Completion Date: 14-Apr-2026
• Ref Project: EN ISO 5211:2026 - Industrial valves - Part-turn actuator attachments (ISO 5211:2026)

Relations

• Replaces: SIST EN ISO 5211:2023 - Industrial valves - Part-turn actuator attachments (ISO 5211:2023)
• Effective Date: 01-May-2026
• Referred By: SIST EN 15714-2:2011 - Industrial valves - Actuators - Part 2: Electric actuators for industrial valves - Basic requirements
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 14141:2013 - Valves for natural gas transportation in pipelines - Performance requirements and tests
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 15714-3:2011 - Industrial valves - Actuators - Part 3: Pneumatic part-turn actuators for industrial valves - Basic requirements
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 13547:2014 - Industrial valves - Copper alloy ball valves
• Effective Date: 04-Mar-2026
• Referred By: SIST-TS CEN/TS 13547:2007 - Industrial valves - Copper alloy ball valves
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 15714-3:2023 - Industrial valves - Actuators - Part 3: Pneumatic part-turn actuators for industrial valves - Basic requirements
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 1983:2006 - Industrial valves - Steel ball valves
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 593:2009+A1:2014 - Industrial valves - Metallic butterfly valves
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 13828:2025 - Building valves - Manually operated copper alloy and stainless steel ball valves for potable water supply in buildings -Tests and requirements
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 15714-4:2025 - Industrial valves - Actuators - Part 4: Hydraulic part-turn actuators for industrial valves - Basic requirements
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 1983:2014 - Industrial valves - Steel ball valves
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 15714-4:2011 - Industrial valves - Actuators - Part 4: Hydraulic part-turn actuators for industrial valves - Basic requirements
• Effective Date: 04-Mar-2026

Overview

FprEN ISO 5211 / ISO/DIS 5211:2025 specifies the mechanical interface between part-turn actuators (with or without gearboxes) and industrial valves. Developed by ISO/TC 153 in collaboration with CEN, the document defines flange and driving-component dimensions, reference torque values for interfaces and couplings, and guidance on interface location and dowel pins. It is intended to standardize actuator-to-valve attachments to enable interchangeability, reliable torque transmission and consistent mounting practices across valve and actuator manufacturers.

Key topics and technical requirements

• Flange dimensions and bolt patterns: Standardized flange types (F03 through F100) with specified diameters, bolt hole arrangements, spigots/recesses and minimum seating dimensions. Holes conform to ISO 273.
• Maximum flange torque values: Reference torque ratings are provided per flange type (e.g., F03 = 32 Nm up to F100 = 1 000 000 Nm), based on bolts in tension at 290 MPa and a friction coefficient of 0.2. Annex A explains calculation methods and assumptions.
• Driving-component interfaces: Detailed dimensions and positions for common drive forms used on part-turn actuators - keys/keyways, parallel or diagonal square heads, flat and improved flat heads, involute splines, and bi-square drives - plus reference torques for couplings.
• Positioning and driven-component location: Requirements for the position of driven components below the actuator interface to ensure correct engagement and alignment.
• Dowel pins and tolerances: Guidance on dowel pin locations and tolerances to maintain repeatable alignment.
• New/updated content in 2025 edition: Addition of Annex B with dimensions and tolerances for keys and keyways and editorial clarifications.

Practical applications and users

Who uses ISO 5211:

• Valve manufacturers specifying flanges and interfaces for actuator-ready valves
• Actuator and gearbox suppliers designing drive components to mate with valves
• OEMs and system integrators who specify valve-actuator assemblies for process plants
• Procurement and maintenance teams ensuring interchangeability and safe torque transmission

Benefits:

• Simplifies actuator selection and retrofits
• Reduces custom machining and field adaptation
• Improves safety and predictability of torque transfer during operation

Related standards

• ISO 5210 - interfaces for multi-turn actuators and gearboxes (referenced for combined assemblies)
• ISO 273 - clearance holes for bolts and screws (normative reference)

Keywords: ISO 5211, part-turn actuator attachments, industrial valves, flange dimensions, actuator-to-valve interface, torque values, valve actuator mounting.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Nadomešča:
SIST EN ISO 5211:2023
Industrijski ventili - Priključki zasučnih pogonov na ventilih (ISO 5211:2026)
Industrial valves - Part-turn actuator attachments (ISO 5211:2026)
Industriearmaturen - Anschlüsse von Schwenkantrieben (ISO 5211:2026)
Robinetterie industrielle - Raccordement des actionneurs à fraction de tour (ISO
5211:2026)
Ta slovenski standard je istoveten z: EN ISO 5211:2026
ICS:
23.060.01 Ventili na splošno Valves in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 5211
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2026
EUROPÄISCHE NORM
ICS 23.060.01 Supersedes EN ISO 5211:2023
English Version
Industrial valves - Part-turn actuator attachments (ISO
5211:2026)
Robinetterie industrielle - Raccordement des Industriearmaturen - Anschlüsse von
actionneurs à fraction de tour (ISO 5211:2026) Schwenkantrieben (ISO 5211:2026)
This European Standard was approved by CEN on 31 January 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 5211:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 5211:2026) has been prepared by Technical Committee ISO/TC 153 "Valves" in
collaboration with Technical Committee CEN/TC 69 “Industrial valves” the secretariat of which is held
by AFNOR.
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 August 2026, and conflicting national standards shall
be withdrawn at the latest by August 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 5211:2023.
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 5211:2026 has been approved by CEN as EN ISO 5211:2026 without any modification.

International
Standard
ISO 5211
Fourth edition
Industrial valves — Part-turn
2026-02
actuator attachments
Robinetterie industrielle — Raccordement des actionneurs à
fraction de tour
Reference number
ISO 5211:2026(en) © ISO 2026
ISO 5211:2026(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 5211:2026(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Maximum flange torques . 2
5 Flange dimensions . 2
6 Designation . 5
7 Dimensions and torques . 6
7.1 General .6
7.2 Drive by key(s) .6
7.3 Drive by parallel or diagonal square head .9
7.4 Drive by flat head .10
7.5 Drive by improved flat head . 12
7.6 Drive by involute spline . 13
7.7 Drive by bi-square .14
8 Position of driven components at interface below part-turn actuator .15
8.1 Drive by key(s) . 15
8.2 Drive by parallel or diagonal square head or bi-square .17
8.3 Drive by flat head .18
9 Dowel pins .18
Annex A (informative) Explanation of calculations . 19
Annex B (normative) Dimensions of keys and keyways .21
Bibliography .27

iii
ISO 5211:2026(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 153, Valves, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 69, Industrial valves, in accordance with
the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 5211:2023), which has been technically
revised.
The main changes are as follows:
— Figure 2 and Table 2 were updated for through bolting;
— editorial changes were made.
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
ISO 5211:2026(en)
Introduction
The purpose of this document is to establish certain basic requirements for the attachment of part-turn
actuators, in order to define the interface between actuator and valve.
This document is, in general, considered in conjunction with the specific requirements which may be agreed
between the parties concerned.
NOTE 1 In this document, the term “valve” can also be understood to include “valve with an intermediate support”
[see Figure 1 b)].
NOTE 2 When a combination of a multi-turn actuator and separate part-turn gearbox is coupled to form a part-
turn actuator, the multi-turn attachment to the gearbox is in accordance with ISO 5210:2026, Figures 1 c) and 1 d). A
combination of a multi-turn actuator with integral part-turn gearbox supplied as a part-turn actuator is in accordance
with Figures 1 a) and 1 b).
a) Direct interface b) Intermediate sup- c) Direct interface d) Intermediate support
port interface (when combination of interface (when combina-
a multi-turn actuator tion of a multi-turn actua-
and a gearbox) tor and a gearbox)
Key
1 part-turn actuator
2 interface (see this document)
3 valve
4 intermediate support
5 gearbox
6 interface (see ISO 5210)
7 multi-turn actuator
Figure 1 — Interface between part-turn actuator and valve

v
International Standard ISO 5211:2026(en)
Industrial valves — Part-turn actuator attachments
1 Scope
This document specifies requirements for the attachment of part-turn actuators, with or without gearboxes,
to industrial valves.
The attachment of part-turn actuators to control valves in accordance with the requirements of this
document is subject to an agreement between the supplier and the purchaser.
This document specifies:
— flange dimensions necessary for the attachment of part-turn actuators to industrial valves [see
Figures 1 a) and 1 c)] or to intermediate supports [see Figures 1 b) and 1 d)];
— driving component dimensions of part-turn actuators necessary to attach them to the driven components;
— reference values for torques for interfaces and for couplings having the dimensions specified in this
document.
The attachment of the intermediate support to the valve is beyond the scope of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 273, Fasteners — Clearance holes for bolts and screws
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
actuator
device designed for attachment to a general-purpose industrial valve in order to provide for the operation of
the valve
Note 1 to entry: The device is designed to operate using motive energy which can be electrical, pneumatic, hydraulic,
manual, etc., or a combination of these. Movement is limited by travel, torque (3.5) or thrust or combination of both.
3.2
multi-turn actuator
actuator (3.1) which transmits torque (3.5) to the valve for at least one revolution and may be capable of
withstanding thrust
Note 1 to entry: An actuator can be a combination of a multi-turn actuator and multi-turn gearbox (3.4).

ISO 5211:2026(en)
3.3
part-turn actuator
actuator (3.1) which transmits torque (3.5) to the valve for a rotation of one revolution or less and does not
have to withstand axial thrust
Note 1 to entry: A part-turn actuator can be a combination of a multi-turn actuator (3.2) and part-turn gearbox (3.4).
3.4
gearbox
mechanism designed to reduce the torque (3.5) required to operate a valve
3.5
torque
turning moment transmitted through the mounting flanges and connection components
Note 1 to entry: Torque is expressed in newton-metres (N·m).
4 Maximum flange torques
The flange torque shall comply with the values listed in Table 1 which represent the maximum torques
which can be transmitted through the mounting flange.
Table 1 — Maximum flange torque values
Maximum flange torque
Flange type
[N·m]
F03 32
F04 63
F05 125
F07 250
F10 500
F12 1 000
F14 2 000
F16 4 000
F25 8 000
F30 16 000
F35 32 000
F40 63 000
F48 125 000
F60 250 000
F80 500 000
F100 1 000 000
The values specified in Table 1 have been defined on the basis of bolts in tension only at a stress of 290 MPa
and a coefficient of friction of 0,2 between the mounting interface. All variations in these defined parameters
lead to variations of the transmittable torque values. See Annex A for more details on the calculation method.
The selection of flange types for a particular application should take into account the additional torques that
may be generated because of inertia or other factors.
5 Flange dimensions
Flanges for part-turn actuator attachments shall comply with the dimensions shown in Figure 2 and given in
Table 2. The method of attachment shall be by means of studs, screws or through bolting.

ISO 5211:2026(en)
Holes for the studs, screws or bolts shall be equi-spaced and positioned off-centre (see Figure 3 and Table 3)
and shall conform to the requirements of ISO 273.
The flange on the valve shall have a recess corresponding to the diameter d . A spigot on the part-turn
actuator is optional.
The minimum values for dimension h shown in Table 2 apply to flanges having material of proof stress
R ≥ 200 MPa. The minimum values for dimension h applied to flanges having materials of proof stress
e 2
R ≤ 200 MPa shall be agreed between manufacturer and purchaser. The minimum values for dimension h
e 3
shall be at least 1 × d .
Dimension d has been based on providing sufficient landing for the nuts and bolt heads where applicable.
Such landing is defined as a radius from the bolt hole centre with the dimension (d − d ) / 2 and is a
1 3
minimum. The flange shape of both valve and actuator outside these areas of landing is left to the discretion
of the manufacturer.
The dimensions and bolting material are based on bolts in tension at a maximum stress of 290 MPa. On
agreement between the manufacturer/supplier and purchaser, bolting material with different tensile
strength may be used, with no dimensional changes but with potential variation of the transmittable torque.
Above flange type F100 alternative dimensions and torque ratings may be used on agreement between
manufacturer/supplier and purchaser.
Figure 2 — Flange dimensions
Table 2 — Flange dimensions
Dimensions in millimetres
Dimensions Number of
screws, studs or
Flange
c d
d h h h h h
1 a b 1 2 3 4 5 bolts
type
d d d d
2 3 4 5
min. max. min. min. min. min.
n
F03 ∅46 ∅25 ∅36 M5 ∅5,5 3 8 5 6 5 4
F04 ∅54 ∅30 ∅42 M5 ∅5,5 3 8 5 6 5 4
F05 ∅65 ∅35 ∅50 M6 ∅6,6 3 9 6 6 6 4
F07 ∅90 ∅55 ∅70 M8 ∅9 3 12 8 8 8 4
F10 ∅125 ∅70 ∅102 M10 ∅11 3 15 10 10 10 4
F12 ∅150 ∅85 ∅125 M12 ∅13,5 3 18 12 14 12 4
a
d shall be manufactured within the diameter tolerance f8.
b
d clearance holes for bolts and screws according to ISO 273 (medium as recommended).
c
h based on ISO 4033 – Hexagon high nuts (style 2).
d
h based on 1,0 × d .
5 4
ISO 5211:2026(en)
TTabablele 2 2 ((ccoonnttiinnueuedd))
Dimensions Number of
screws, studs or
Flange
c d
d h h h h h
1 1 2 3 4 5 bolts
type a b
d d d d
2 3 4 5
min. max. min. min. min. min.
n
F14 ∅175 ∅100 ∅140 M16 ∅17,5 4 24 16 18 16 4
F16 ∅210 ∅130 ∅165 M20 ∅22 5 30 20 22 20 4
F25 ∅300 ∅200 ∅254 M16 ∅17,5 5 24 16 18 16 8
F30 ∅350 ∅230 ∅298 M20 ∅22 5 30 20 22 20 8
F35 ∅415 ∅260 ∅356 M30 ∅33 5 45 30 30 30 8
F40 ∅475 ∅300 ∅406 M36 ∅39 8 54 36 36 36 8
F48 ∅560 ∅370 ∅483 M36 ∅39 8 54 36 36 36 12
F60 ∅686 ∅470 ∅603 M36 ∅39 8 54 36 36 36 20
F80 ∅900 ∅670 ∅813 M42 ∅45 10 63 42 42 42 20
F100 ∅1 200 ∅870 ∅1 042 M42 ∅45 10 63 42 42 42 32
a
d shall be manufactured within the diameter tolerance f8.
b
d clearance holes for bolts and screws according to ISO 273 (medium as recommended).
c
h based on ISO 4033 – Hexagon high nuts (style 2).
d
h based on 1,0 × d .
5 4
Figure 3 — Position of holes
Table 3 — Position of holes
Flange type α/2
F03 to F16 45 °
F25 to F40 22,5 °
F48 15 °
F60 to F80 9 °
F100 5,625 °
ISO 5211:2026(en)
6 Designation
Part-turn valve actuator attachments shall be designated as follows:
— flange designation:
— flange type as per Table 1;
— a capital letter for spigot identification:
— Y with spigot;
— N without spigot;
— drive designation:
— an additional capital letter for drive identification:
— V for single-key drive;
— W for 90 ° two-key drive;
— X for 180 ° two-key drive;
— L for parallel square drive;
— D for diagonal square drive;
— H for flat head drive;
— G for improved flat head drive;
— S for involute spline;
— T for bi-square;
— the actual dimensions of the drive (in millimetres):
— dimension d for key drives (see Figure 4 and Table 4);
— dimension s for square or flat drives (see Figure 5 or 6 and Table 5 or Figure 7 and Table 6);
— module m for involute spline (see Figure 9 and Table 8).

ISO 5211:2026(en)
EXAMPLE
ISO 5211 – F05 Y – V – 18 identifies a part-turn valve actuator attachment according to this document, with
F05 flange type, spigot and single-key drive with 18 mm diameter.
NOTE The designation is not a marking requirement.
7 Dimensions and torques
7.1 General
To ensure that no interference can occur between the driving component and the driven component, the
length of the driven component above the interface shall be limited so that there is a clearance between both
parts.
The depth of engagement of the valve driven component into the actuator drive component and the
surface area of contact between the faces of the actuator drive component and the faces of the valve driven
component should be considered to ensure that the stresses caused by contact do not exceed the capability
of the component materials. In some cases, it can be necessary to use materials with superior mechanical
properties and/or to reduce the output torque of the actuator.
7.2 Drive by key(s)
Dimensions of the drive components for key drive shall meet the requirements of Figure 4 and Table 4.
The values of d , h and l in Table 4 are based on single-key design up to 98 mm shaft diameter.
7 4 5
Where more than one key is required to transmit the torque, the dimensions in Table 4 shall still apply.
The key dimensions shall conform with those given in Annex B or any national standard.
The keyway(s) in the driving component shall correspond to the position of the key(s) supplied on the driven
component as specified in 8.1, Figures 11, 12 or 13.
The key(s) shall be secured in position by suitable means.

ISO 5211:2026(en)
Key
1 interface
Figure 4 — Drive by key(s)
ISO 5211:2026(en)
Table 4 — Dimensions and torques for drive by key(s)
Dimensions in millimetres
Max.
Flange flange h l
4 5 a, b, g
d
f 7
type torque max. min.
[N·m]
c
F05 125 3,0 30 ∅12 ∅14 ∅18 ∅22 — — — — — — — — — — — — — — — — —
c
F07 250 3,0 35 — ∅14 ∅18 ∅22 ∅28 — — — — — — — — — — — — — — — —
c
F10 500 3,0 45 — — ∅18 ∅22 ∅28 ∅36 ∅42 — — — — — — — — — — — — — —
c
F12 1 000 3,0 55 — — — ∅22 ∅28 ∅36 ∅42 ∅48 ∅50 — — — — — — — — — — — —
c
F14 2 000 5,0 65 — — — — ∅28 ∅36 ∅42 ∅48 ∅50 ∅60 — — — — — — — — — — —
c
F16 4 000 5,0 80 — — — — — — ∅42 ∅48 ∅50 ∅60 ∅72 ∅80 — — — — — — — — —
c
F25 8 000 5,0 110 — — — — — — — ∅48 ∅50 ∅60 ∅72 ∅80 ∅98 ∅100 —
...