Foreword

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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 second edition cancels and replaces the first edition ( ISO 16650:2004 ), which has been technically revised.

The main changes are as follows:

the terms and definitions clause (Clause 3) has been revised;
super tensile strength has been added in Clause 4;
the table of chemical composition (former Table 1) of steel has been deleted and subsequent tables have been renumbered;
metallic coating (6.2) has been revised;
cumar weight (6.3) has been added;
the mechanical properties (6.4) has been revised;
surface quality (6.5) has been revised;
delivery conditions (6.6) has been revised;
torsion test (6.4.3) has been revised;
adhesion testing (Annex A) has been revised.

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.

1 Scope

This document specifies the requirements and characteristics of round and flat wire used for strengthening the bead of all kinds of tyres.

2 Normative references

3 Terms and definitions

4 Classification

5 Designation and ordering

5.1 Designation

5.2 Information to be supplied by the purchaser

6 Requirements

6.1 Chemical composition of steel

6.2 Metallic coating

6.3 Cumar weight

6.4 Mechanical properties

6.5 Surface quality

6.6 Delivery conditions

6.7 Dimensions and tolerances

7 Testing and inspection

7.1 Tests and inspection documents

7.2 Programme for specific inspection

7.3 Test procedures

7.4 Retests

8 Marking, labelling, packaging and shelf life

Bibliography

ISO 16650:2025

Bead wire

Current

Published:

14 Aug 2025

1 Scope