ISO 8458-1

Steel wire for mechanical springs - Part 1: General requirements

ISO 8458-1 specifies general requirements for steel spring wire of round cross-section, suitable for the manufacture of mechanical springs.

Fils en acier pour ressorts mécaniques — Partie 1: Exigences générales

L'ISO 8458-1 spécifie des exigences générales pour les fils en acier de section ronde destinés à la fabrication des ressorts mécaniques.

General Information

• Status: Not Published
• ICS: 77.140.25 - Spring steels
• Technical Committee: ISO/TC 17/SC 17 - Steel wire rod and wire products
• Drafting Committee: ISO/TC 17/SC 17 - Steel wire rod and wire products
• Current Stage: 6000 - International Standard under publication
• Start Date: 24-Dec-2025
• Completion Date: 27-Dec-2025

Relations

• Revises: ISO 8458-1:2002 - Steel wire for mechanical springs - Part 1: General requirements
• Effective Date: 28-Jun-2025

Overview - ISO 8458-1: Steel wire for mechanical springs (General requirements)

ISO 8458-1 specifies the general requirements for round-section steel wire intended for the manufacture of mechanical springs. It is the Part 1 (general) document in the ISO 8458 series (which also includes Part 2: patented cold-drawn non‑alloy wire and Part 3: oil‑hardened and tempered wire). The standard defines the information suppliers and purchasers must exchange and establishes requirements for dimensional tolerances, surface quality, inspection, testing and marking.

Key topics and technical requirements

• Scope and structure: covers round cross‑section steel spring wire suitable for static and dynamic spring applications and references related normative documents (e.g., ISO 377, ISO 404, ISO 6892‑1, ISO 7438, ISO 7800/7802, ISO 3887, ISO 10474).
• Information to be supplied by the purchaser: quantity, relevant ISO part number (ISO 8458-1/2/3), wire grade, surface finish/coating, nominal diameter, form of delivery and unit mass, type of inspection document, and any special agreements.
• Dimensional tolerances: the standard includes diameter tolerance classes (for coiled wire and for straightened and cut lengths) and prescribes how diameter measurements are to be made.
• Surface quality: criteria and accepted test methods for detecting surface defects and decarburization, including deep etch and eddy‑current techniques.
• Inspection and testing: details on sample selection and test-piece preparation plus required mechanical and functional tests:
  • Chemical analysis and sampling methods
  • Tensile testing (room temperature)
  • Wrapping, coiling, torsion and bend tests
  • Diameter measurement procedures
  • Decarburization depth determination
  • Retest provisions and inspection documentation requirements
• Marking and complaints: identification/marking requirements and procedures for handling nonconformities.

Practical applications and users

ISO 8458-1 is used by:

• Spring manufacturers producing compression, tension, torsion and precision springs
• Steel wire producers and suppliers who need to certify wire for spring applications
• Procurement and quality engineers specifying wire for automotive, industrial, aerospace, electronics and consumer‑product springs
• Test laboratories performing mechanical and surface integrity testing

Benefits include clearer purchaser-supplier communication, consistent dimensional and surface criteria, and standardized test methods that improve spring performance, reliability and interchangeability.

Related standards

• ISO 8458-2 (patented cold‑drawn non‑alloy steel wire)
• ISO 8458-3 (oil‑hardened and tempered wire)
• Normative references cited (e.g., ISO 377, ISO 404, ISO 6892‑1, ISO 7438, ISO 7800/7802, ISO 10474)

Keywords: ISO 8458-1, steel spring wire, mechanical springs, dimensional tolerances, surface quality, inspection and testing, wire grades, spring manufacturing.

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/FDIS 8458-1
ISO/TC 17/SC 17
Steel wire for mechanical springs —
Secretariat: SAC
Part 1:
Voting begins on:
General requirements
Voting terminates on:
Fils en acier pour ressorts mécaniques —
Partie 1: Exigences générales
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 8458-1:2025(en) © ISO 2025

FINAL DRAFT
ISO/FDIS 8458-1:2025(en)
International
Standard
ISO/FDIS 8458-1
ISO/TC 17/SC 17
Steel wire for mechanical springs —
Secretariat: SAC
Part 1:
Voting begins on:
General requirements
Voting terminates on:
Fils en acier pour ressorts mécaniques —
Partie 1: Exigences générales
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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 Reference number
ISO/FDIS 8458-1:2025(en) © ISO 2025

ii
ISO/FDIS 8458-1:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Information to be supplied by the purchaser . 2
5 Requirements . 3
5.1 Dimensional tolerances .3
5.2 Surface quality .4
6 Inspection and testing . 4
6.1 General .4
6.2 Selection and preparation of samples and test pieces .5
6.3 Chemical analysis .5
6.4 Tensile test .5
6.5 Wrapping test .5
6.6 Coiling test .5
6.7 Torsion test .5
6.8 Bend test .5
6.9 Diameter measurement .5
6.10 Surface quality test methods .5
6.10.1 Deep etch test .5
6.10.2 Eddy current test .6
6.10.3 Decarburization .6
6.11 Retests .6
6.12 Inspection documents.6
7 Marking . . 6
8 Complaints . 7
Bibliography . 8

iii
ISO/FDIS 8458-1:2025(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 17, Steel, Subcommittee SC 17, Steel wire rod
and wire products.
This third edition cancels and replaces the second edition (ISO 8458-1:2002), of which it constitutes a minor
revision.
The changes are as follows:
— the normative references have been updated;
— the structure of the document has been updated in accordance with the latest ISO/IEC Directives, Part 2.
A list of all parts in the ISO 8458 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.

iv
FINAL DRAFT International Standard ISO/FDIS 8458-1:2025(en)
Steel wire for mechanical springs —
Part 1:
General requirements
1 Scope
This document specifies general requirements for steel spring wire of round cross-section, suitable for the
manufacture of mechanical springs.
2 Normative references
The following documents are referred to in the text in suc
...

Style Definition
ISO/TC 17/SC 17 N 1378 .
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ISO/FDIS 8458-1(en) Section start: New page, Header distance from edge:
1.27 cm, Footer distance from edge: 1.27 cm
ISO/TC 17/SC 17
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Date: 2025-09-15
Secretariat: SAC
Formatted
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Date: 2025-10-13
Steel wire for mechanical springs —
Formatted: Regular, French (Switzerland)
Part 1:
Formatted: Cover Title_A2
General requirements
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Fils en acier pour ressorts mécaniques —
Partie 1: Exigences générales
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2 © ISO #### – All rights reserved

ISO/FDIS 8458-1:2025(en)
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Before: 0 pt, No page break before, Adjust space
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
between Latin and Asian text, Adjust space between
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
Asian text and numbers, Border: Top: (No border), Left:
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
(No border), Right: (No border)
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
Formatted: French (Switzerland)
EmailE-mail: [e-mail]
Formatted: French (Switzerland)
Website: www.iso.orgwww.iso.org
Formatted: French (Switzerland)
Published in Switzerland
Formatted: French (Switzerland)
Formatted: English (United Kingdom)

iii
ISO/FDIS 8458-1:2025(en)
Contents Formatted: Space Before: 48 pt
Foreword . v
1 Scope . vi
2 Normative references . 1
3 Terms and definitions . 1
4 Information to be supplied by the purchaser . 2
5 Requirements . 3
6 Inspection and testing . 5
7 Marking . 7
8 Complaints . 7
Bibliography . 8

Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Information to be supplied by the purchaser . 2
5 Requirements . 3
5.1 Dimensional tolerances . 3
5.2 Surface quality . 5
6 Inspection and testing . 5
6.1 General . 5
6.2 Selection and preparation of samples and test pieces . 5
6.3 Chemical analysis . 5
6.4 Tensile test . 5
6.5 Wrapping test . 5
6.6 Coiling test . 5
6.7 Torsion test . 6
6.8 Bend test . 6
6.9 Diameter measurement . 6
6.10 Surface quality test methods . 6
6.10.1 Deep etch test . 6
6.10.2 Eddy current test . 6
6.10.3 Decarburization . 6
6.11 Retests . 6
6.12 Inspection documents . 6
7 Marking . 7
8 Complaints . 7

iv
ISO/FDIS 8458-1:2025(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
Formatted: Font color: Auto
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
Formatted: Font color: Auto
ISO documentsdocument should be noted. This document was drafted in accordance with the editorial rules
Formatted: Font color: Auto
of the ISO/IEC Directives, Part 2 (see www.iso.org/directives 2 (see www.iso.org/directives).
Formatted: Font color: Auto
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
Formatted: Font color: Auto, English (United Kingdom)
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.www.iso.org/patents. ISO shall not be held responsible for identifying any or all such
Formatted: Font color: Auto, English (United Kingdom)
patent rights.
Any trade name used in this document is information given for the convenience of users and does not
Formatted: Font color: Auto
constitute an endorsement.
Formatted: Font color: Auto
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.htmlwww.iso.org/iso/foreword.html.
Formatted: Font color: Auto
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 17, Steel wire rod
Formatted: Font: Not Italic
and wire products.
Formatted: Font: Not Italic
Formatted: Font: Not Italic
This third edition cancels and replaces the second edition (ISO 8458-1:2002), of which has been editorially
revisedit constitutes a minor revision.
The main changes are as follows:
Formatted: Font: Cambria
— — the normative references have been updated ;
Formatted: List Continue 1
— the structure of the document has been updated in accordance with the latest ISO/IEC
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Directives,
— Part 2.
Formatted: List Continue 1, Indent: Left: 0 cm
Formatted: Font: Not Italic
ISO 8458 consistsA list of the followingall parts, under in the ISO 8458 series can be found on the general title
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.
v
ISO/FDIS 8458-1(en)
Formatted: Font: 16 pt, English (United Kingdom)
Steel wire for mechanical springs: —
Formatted: Main Title 1
— Part 1:
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General requirements
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— Part 2: Patented cold-drawn non-alloy steel wire

— Part 3: Oil-hardened and tempered wire
vi © ISO 2025 – All rights reserved

ISO/FDIS 8458-1:2025(en)
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Formatted: Right: 1.5 cm, Bottom: 1 cm, Gutter: 0 cm,
Steel wire for mechanical springs — Part 1: General requirements
Section start: New page, Header distance from edge:
1.27 cm, Footer distance from edge: 0.5 cm
1 Scope
This document specifies general requirements for steel spring wire of round cross-section, suitable for the
manufacture of mechanical springs.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
Formatted: Font color: Auto
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 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical testing
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ISO 404, Steel and steel products — General technical delivery requirements
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ISO 3887, Steels — Determination of the depth of decarburization
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 7438, Metallic materials — Bend test
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ISO 7800, Metallic materials — Wire — Simple torsion test
ISO 7802, Metallic materials — Wire — Wrapping test
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ISO 8458-2, Steel wire for mechanical springs — Part 2: Patented cold-drawn non-alloy steel wire
ISO 8458-3, Steel wire for mechanical springs — Part 3: Oil-hardened and tempered wire
ISO/TR 9769, Steel and iron — Review of available methods of analysis
ISO 10474:2013, Steel and steel products — Inspection documents
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1ISO 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/
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3.1
cast Formatted: Font: 10 pt
geometrical shape (characterized by overall diameter and helical separation of ends) adopted by a single ring
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of wire when cut from the coil
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spacing: single
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© ISO 2025 – All rights reserved
ISO/FDIS 8458-1:2025(en)
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3.2 3.2
Formatte
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