ISO 8458-1:2026

International
Standard
ISO 8458-1
Third edition
Steel wire for mechanical springs —
2026-01
Part 1:
General requirements
Fils en acier pour ressorts mécaniques —
Partie 1: Exigences générales
Reference number
© ISO 2026
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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 .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 . . 6
8 Complaints . 7
Bibliography . 8

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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
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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
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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
International Standard ISO 8458-1:2026(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 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 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical testing
ISO 404, Steel and steel products — General technical delivery requirements
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
ISO 7800, Metallic materials — Wire — Simp
...