SIST EN ISO 5821:2025

SLOVENSKI STANDARD
01-oktober-2025
Nadomešča:
SIST EN ISO 5821:2010
Uporovno varjenje - Elektrode za točkovno varjenje - Kape elektrod z notranjim
konusom (ISO 5821:2025)
Resistance welding - Spot welding electrodes - Female electrode caps (ISO 5821:2025)
Widerstandsschweißen - Punktschweiß-Elektroden - Elektronenkappen mit Innenkegel
(ISO 5821:2025)
Soudage par résistance - Électrodes pour soudage par points - Embouts amovibles
femelles d'électrodes (ISO 5821:2025)
Ta slovenski standard je istoveten z: EN ISO 5821:2025
ICS:
25.160.30 Varilna oprema Welding equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 5821
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2025
EUROPÄISCHE NORM
ICS 25.160.30 Supersedes EN ISO 5821:2009
English Version
Resistance welding - Spot welding electrodes - Female
electrode caps (ISO 5821:2025)
Soudage par résistance - Électrodes pour soudage par Widerstandsschweißen - Punktschweiß-Elektroden -
points - Embouts amovibles femelles d'électrodes (ISO Elektronenkappen mit Innenkegel (ISO 5821:2025)
5821:2025)
This European Standard was approved by CEN on 13 June 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 5821:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 5821:2025) has been prepared by Technical Committee ISO/TC 44 "Welding
and allied processes" in collaboration with Technical Committee CEN/TC 121 “Welding and allied
processes” 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 December 2025, and conflicting national standards
shall be withdrawn at the latest by December 2025.
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 5821:2009.
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 5821:2025 has been approved by CEN as EN ISO 5821:2025 without any modification.

International
Standard
ISO 5821
Third edition
Resistance welding — Spot welding
2025-06
electrodes — Female electrode caps
Soudage par résistance — Électrodes pour soudage par points —
Embouts amovibles femelles d'électrodes
Reference number
ISO 5821:2025(en) © ISO 2025
ISO 5821:2025(en)
© ISO 2025
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 5821:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions and tolerances . 1
5 Material. 5
6 Designation . 5
7 Labelling and marking. 6
7.1 Labelling .6
7.2 Marking .6
Annex A (informative) Alternative types and dimensions of female electrode caps . 7
Annex B (informative) Comparison of electrode tip shape names used in worldwide .10
Bibliography .11

iii
ISO 5821:2025(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 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 44, Welding and allied processes, Subcommittee
SC 6, Resistance welding and allied mechanical joining, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 121, Welding and allied processes, in accordance with
the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 5821:2009), which has been technically
revised.
The main changes are as follows:
— Clause 4, Tables 1 and 2 revised, and Tables 2 and 3 renumbered;
— Clause 6, examples updated to new values in Tables 1 and 2 more examples added for clarification;
— Clause 7, labelling on the packages, and marking on each electrode cap surface;
— Figure 1, updated drawings with correct proportions;
— Figure 2, added to know the variety of the water-cooling hole bottom profiles;
— Annex A, revised and made informative;
— Annex B, added to show the comparative table of electrode tip shape names in some countries.
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. Official interpretations of ISO/TC 44 documents, where they exist, are
available from this page: https://committee.iso.org/sites/tc44/home/interpretation.html.

iv
International Standard ISO 5821:2025(en)
Resistance welding — Spot welding electrodes — Female
electrode caps
1 Scope
This document specifies the dimensions and tolerances of female electrode caps for resistance spot welding
of metallic materials.
Taper dimensions and tolerances of the electrode caps follow the values specified in ISO 1089.
NOTE Electrode caps with locking tapers are addressed in ISO 20168. Male electrode caps are specified in
ISO 5830.
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 1089, Resistance welding equipment — Electrode taper fits for spot welding equipment — Dimensions
ISO 5182, Resistance welding — Materials for electrodes and ancillary equipment
ISO 17677-1, Resistance welding — Vocabulary — Part 1: Spot, projection and seam welding
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 17677-1 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/
4 Dimensions and tolerances
The dimensions shall be as given in Table 1 and Figure 1 for taper 1:10. ISO 1089 shall be used to provide the
taper dimensions and tolerances. Tolerances other than taper fits shall be as given in Table 2.
Annex A addresses alternative types and dimensions of female electrode caps.
Annex B shows the various names used for electrodes in different countries.
To enlarge the application potential of this document, common variations of the base types are specified in
Table 1.
ISO 5821:2025(en)
Table 1 — Dimensions for taper 1:10 (preferred values are printed in bold-face)
Dimensions in millimetres
α
Type d d l l l e R R
1 2 1 2 3 1 2
°
13 — — — 18,0 21,0 24,0 8,5 — — 30 65 100 — — — —
A0 16
...