SIST EN ISO 22705-1:2025

SLOVENSKI STANDARD
01-december-2025
Vzmeti - Merilni in preskusni parametri - 1. del: Hladno oblikovane cilindrične
vijačne, tlačne vzmeti (ISO 22705-1:2021)
Springs - Measurement and test parameters - Part 1: Cold formed cylindrical helical
compression springs (ISO 22705-1:2021)
Federn - Mess- und Prüfgrößen - Teil 1: Kaltgeformte zylindrische
Schraubendruckfedern (ISO 22705-1:2021)
Ressort - Mesures et paramètres d'essai - Partie 1: Ressort hélicoïdal de compression
cylindrique formé à froid (ISO 22705-1:2021)
Ta slovenski standard je istoveten z: EN ISO 22705-1:2025
ICS:
21.160 Vzmeti Springs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 22705-1
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2025
EUROPÄISCHE NORM
ICS 21.160
English Version
Springs - Measurement and test parameters - Part 1: Cold
formed cylindrical helical compression springs (ISO
22705-1:2021)
Ressorts - Mesures et paramètres et d'essai - Partie 1: Federn - Mess- und Prüfgrößen - Teil 1: Kaltgeformte
Ressorts hélicoïdaux de compression cylindriques zylindrische Schraubendruckfedern (ISO 22705-
formés à froid (ISO 22705-1:2021) 1:2021)
This European Standard was approved by CEN on 29 September 2025.

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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 22705-1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 22705-1:2021 has been prepared by Technical Committee ISO/TC 227 "Springs” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 22705-1:2025
by Technical Committee CEN/TC 407 “Technical springs” 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 April 2026, and conflicting national standards shall be
withdrawn at the latest by April 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.
Any feedback and questions on this document should be directed to the users’ national standards body.
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 22705-1:2021 has been approved by CEN as EN ISO 22705-1:2025 without any
modification.
INTERNATIONAL ISO
STANDARD 22705-1
First edition
2021-03
Springs — Measurement and test
parameters —
Part 1:
Cold formed cylindrical helical
compression springs
Ressort - Mesures et paramètres d'essai —
Partie 1: Ressort hélicoïdal de compression cylindrique formé à froid
Reference number
ISO 22705-1:2021(E)
©
ISO 2021
ISO 22705-1:2021(E)
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
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Phone: +41 22 749 01 11
Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2021 – All rights reserved

ISO 22705-1:2021(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 1
3.1 Terms and definitions . 1
3.2 Symbols and abbreviated terms. 2
4 Environmental conditions . 3
5 Qualifications of the person(s) performing the work . 3
6 Geometries of guiding and supporting devices . 4
7 Measuring and testing equipment . 4
8 Measurement and test parameter for technical cold formed cylindrical
compression springs . 4
8.1 Free length (L ). 4
8.1.1 General. 4
8.1.2 Type of characteristic . 4
8.1.3 Measuring and/or testing equipment . 4
8.1.4 Conditions of measurement and testing . 5
8.1.5 Method of measurement and testing . 5
8.1.6 Test location on the product . 6
8.2 Outside diameter (D ) . 6
e
8.2.1 General. 6
8.2.2 Type of characteristic . 6
8.2.3 Measurement and/or testing equipment . 7
8.2.4 Conditions of measurement and testing . 7
8.2.5 Method of measurement and testing . 7
8.2.6 Test location on the product . 9
8.3 Inside diameter (D ) .10
i
8.3.1 General.10
8.3.2 Type of characteristic .10
8.3.3 Measuring and/or testing equipment .10
8.3.4 Conditions of measurement and testing .10
8.3.5 Method of measurement and testing .10
8.3.6 Test location on the product .12
8.4 Total number of coils (n ), number of active coils (n) and coil direction .13
t
8.4.1 General.13
8.4.2 Type of characteristic .13
8.4.3 Measuring and/or testing equipment .15
8.4.4 Conditions of measurement and testing .15
8.4.5 Method of measurement and testing .15
8.4.6 Test location on the product .16
8.5 Applied end coils .16
8.5.1 General.16
8.5.2 Type of characteristic .16
8.5.3 Measuring and/or testing equipment .17
8.5.4 Conditions of measurement and testing .17
8.5.5 Method of measurement and testing .17
8.5.6 Test location on the product .17
8.6 Solid length (L )/solid force (F ) .17
c c
8.6.1 General.17
8.6.2 Type of characteristics .17
8.6.3 Measuring and/or testing equipment .18
8.6.4 Conditions of measurement and testing .18
ISO 22705-1:2021(E)
8.6.5 Method of measurement and testing .18
8.6.6 Test location on the product .19
8.7 Spring load (F) .19
8.7.1 General.19
8.7.2 Type of characteristic .19
8.7.3 Measuring and/or testing equipment .19
8.7.4 Conditions of measurement and testing .19
8.7.5 Method of measurement and testing .20
8.7.6 Test location on the product .20
8.8 Spring pitch (p)/distance between the coils .20
8.8.1 General.20
8.8.2 Type of characteristic .20
8.8.3 Measuring and/or testing equipment .21
8.8.4 Conditions of measurement and testing .21
8.8.5 Method of measurement and testing .21
8.8.6 Test location on the product .21
8.9 Ground surface/angle .21
8.9.1 General.21
8.9.2 Type of characteristic .22
8.9.3 Measuring and/or testing equipment .22
8.9.4 Conditions of measurement and testing .23
8.9.5 Method of measurement and testing .23
8.9.6 Test location on the product .23
8.10 Perpendicularity (e ) .23
8.10.1 General.23
8.10.2 Type of characteristic .23
8.10.3 Measuring and/or testing equipment .24
8.10.4 Conditions of measurement and testing .24
8.10.5 Method of measurement and testing .24
8.10.6 Test location on the product .25
8.11 Parallelism (e ) .25
8.11.1 General.25
8.11.2 Type of characteristic .25
8.11.3 Measuring and/or testing equipment .25
8.11.4 Conditions of measurement and testing .26
8.11.5 Method of measurement and testing .26
8.11.6 Test location on the product .26
8.12 Shear-off burr .26
8.12.1 General.26
8.12.2 Type of characteristic .27
8.12.3 Measuring and/or testing equipment .27
8.12.4 Conditions of measurement and testing .27
8.12.5 Method of measurement and testing .27
8.12.6 Test location on the product .28
Annex A (informative) Calculation of spring rate (R) .29
Bibliography .30
iv © ISO 2021 – All rights reserved

ISO 22705-1:2021(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
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 227, Springs.
A list of all parts in the ISO 22705 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.
INTERNATIONAL STANDARD ISO 22705-1:2021(E)
Springs — Measurement and test parameters —
Part 1:
Cold formed cylindrical helical compression springs
1 Scope
This document specifies the measurement and test methods for the general characteristics of cold
formed helical compression springs made from round wire, excluding dynamic testing.
2 Normative references
There are no normative references in this document.
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1.1
spring
mechanical device designed to store energy when deflected and to return the equivalent amount of
energy when released
[SOURCE: ISO 26909:2009, 1.1]
3.1.2
compression spring
spring that offers resistance to a compressive force applied axially
Note 1 to entry: In the narrow sense, a compression spring indicates a helical compression spring.
[SOURCE: ISO 26909:2009, 1.2]
3.1.3
coil spring
coil-shaped spring
[SOURCE: ISO 26909:2009, 3.11]
3.1.4
helical compression spring
compression spring made of wire of circular cross-section, wound around an axis with spaces between
its coils
[SOURCE: ISO 26909:2009, 3.12, modified — limited to wires with circular cross-section]
ISO 22705-1:2021(E)
3.1.5
cold formed spring
spring formed at ambient temperature
[SOURCE: ISO 26909:2009, 1.12]
3.1.6
active coils
total number of coils less the inactive coils
Note 1 to entry: This is the number of coils used in computing the total deflection of a spring.
[SOURCE: ISO 26909:2009, 5.70, modified — extended to all inactive coils]
3.1.7
test parameter
parameter with a tolerance for which there is an immediate conclusion after the test (within tolerance
or out of tolerance)
Note 1 to entry: Test can be performed without measurement (i.e. with GO/NO-GO gauges).
3.2 Symbols and abbreviated terms
Table 1 includes the symbols and abbreviated terms used throughout this document.
Table 1 — Symbols and abbreviated terms
Symbols Units Designations
D mm outside diameter of spring
e
D mm maximum outside diameter of spring
e,max
D mm minimum outside diameter of spring
e,min
D mm inside diameter of spring
i
D mm maximum inside diameter of spring
i,max
D mm minimum inside diameter of spring
i,min
d mm diameter of wire
d mm maximum diameter of wire
max
d mm actual wire diameter
wire
e mm perpendicularity
e mm parallelism
F N spring load or force
F N spring load at solid length, L
c c
F N maximum specified spring load
max
F N minimum specified spring load
min
F N spring load for the minimum test length, L
n n
F , F ,… N specified spring loads for the specified spring lengths, L , L ,…
1 2 1 2
L mm solid length
c
L mm maximum specified spring length
max
L mm minimum specified spring length
min
L mm minimum acceptable test length for F
n n
L mm free length
L mm maximum free length
0,max
L mm minimum free length
0,min
L , L ,… mm specified spring lengths for the spring loads, F , F ,…
1 2 1 2
2 © ISO 2021 – All rights reserved

ISO 22705-1:2021(E)
Table 1 (continued)
Symbols Units Designations
n – active coils
n – total number of coils
t
p mm spring pitch
ΔF ΔF
N/mm spring rate (see Annex A)
R= =
ΔL Δs
s mm deflection of spring
s mm deflection of spring for the solid length, L
c c
s mm deflection of the spring (stroke) between two loads, ΔF
h
s mm maximum test spring deflection for the spring load, F
n n
s , s ,… mm specified spring deflections for the specified spring loads, F , F ,…
1 2 1 2
u mm distance between the coils

Figure 1 — Symbols for helical compression springs
4 Environmental conditions
The spatial distribution and equipment of the facility shall permit a reliable implementation of the
measurements and tests. Measurements and tests should be carried out at ambient temperature
in a normal workshop environment. Special tests (e.g. in air-conditioned rooms or other special
environments) shall be agreed upon between the manufacturer and the customer. Measuring and
testing equipment should be subject to regular inspection.
5 Qualifications of the person(s) performing the work
The measurements and tests shall be carried out by a person who has been instructed/trained in the
use of the measuring and testing equipment, as well as regarding methods and test requirements.
The qualifications or additional knowledge and skills should be documented in appropriate qualification
or training documents, depending on the requirements.
ISO 22705-1:2021(E)
6 Geometries of guiding and supporting devices
If guiding and supporting devices (e.g. test pins, guide sleeves, ring grooves) are used, the properties
(e
...