ISO/TS 25393
(Main)Fasteners — Coating system assessment — Complementary and additional aspects to CQI-11
General Information
- Abstract
This document deals with electroplating process evaluation for fasteners, including fastener expected coating properties. This document is a complement to CQI-11 in order to deal with fastener specific aspects not fully covered by CQI-11, and to clarify some questions/items when they are not fully suitable for fasteners. This document is a guide applicable to all parties involved in the supply chain for coated fasteners, i.e. fastener manufacturers, chemical suppliers, electroplaters and purchasers. The requirements for electroplating fasteners specified in this document are essentially based on ISO 4042, ISO/TR 20491 and ISO 16047. NOTE Requirements for electroplating fasteners are also given in ASTM F1941/F1941M.
- Status
- Not Published
- Technical Committee
- ISO/TC 2/SC 14 - Surface coatings
- Drafting Committee
- ISO/TC 2/SC 14 - Surface coatings
- Current Stage
- 6000 - International Standard under publication
- Start Date
- 17-Sep-2026
- Completion Date
- 26-Sep-2026
Buy Documents
ISO/DTS 25393 - Fasteners — Coating system assessment — Complementary and additional aspects to CQI-11
REDLINE ISO/DTS 25393 - Fasteners — Coating system assessment — Complementary and additional aspects to CQI-11
ISO/DTS 25393 - Fixations — Évaluation des systèmes de revêtement électrolytiques — Aspects complémentaires et additionnels au CQI-11
Overview
ISO/TS 25393: Fasteners - Coating System Assessment - Complementary and Additional Aspects to CQI-11 is an international technical specification developed by ISO. This document guides the assessment and evaluation of electroplating processes for fasteners, focusing on coating system properties not fully addressed by the Automotive Industry Action Group’s CQI-11 standard. Serving as a crucial supplement to CQI-11, ISO/TS 25393 clarifies fastener-specific requirements for supply chain stakeholders including manufacturers, chemical suppliers, electroplaters, and purchasers.
The technical specification draws on key standards such as ISO 4042 (electroplated coating systems), ISO/TR 20491 (hydrogen embrittlement), and ISO 16047 (torque/clamp force testing), ensuring thorough and harmonized quality assurance for coated fasteners.
Key Topics
Applicability of CQI-11 to Fasteners
- Identifies gaps in CQI-11 for fastener applications and provides guidance on modifications and additional requirements.
- Clarifies which CQI-11 items are directly relevant, need substitution, or require additional steps for coated fastener products.
Hydrogen Embrittlement Prevention
- Provides detailed prevention measures for various fastener types, including procedures for documentation, baking, and testing.
- Emphasizes timely baking and proper documentation to minimize internal hydrogen embrittlement risks.
Quality Documentation
- Outlines reporting requirements for chemical composition, coating thickness, torque/clamp force, gaugeability, and corrosion resistance.
Additional Critical Areas Not Covered in CQI-11
- Addresses chemical composition and coating thickness measurement.
- Covers issues relating to fastener gaugeability, assemblability, and performance testing such as torque/clamp force and corrosion.
Applications
ISO/TS 25393 offers significant value for organizations involved in the production and procurement of electroplated fasteners. Key applications include:
- Manufacturers: Implement standardized procedures for process evaluation, ensuring coated fasteners comply with international requirements and industry best practices.
- Electroplaters: Supplement existing CQI-11 assessments with fastener-specific measures, particularly around hydrogen embrittlement, to enhance quality and traceability.
- Quality Assurance Teams: Use explicit guidance on test methods and documentation for chemical composition, coating thickness, and physical performance testing.
- Procurement and Supply Chain: Suppliers and purchasers can clearly communicate coating performance specifications and verification requirements, reducing risks of product failure and ensuring compliance with automotive and industrial standards.
- Auditors: Reference ISO/TS 25393 when auditing fastener production lines to ensure that all relevant electroplating and coating assessment criteria are met.
Practical Benefits
- Improved risk management for hydrogen embrittlement in steel fasteners.
- Structured guidance for adopting CQI-11 to the unique needs of fastener coatings.
- Enhanced confidence in the quality and performance of coated fasteners across automotive, construction, and industrial sectors.
Related Standards
Organizations implementing ISO/TS 25393 should also be familiar with the following related international and industry standards:
- ISO 4042: Fasteners - Electroplated coating systems
- ISO/TR 20491: Fasteners - Fundamentals of hydrogen embrittlement in steel fasteners
- ISO 16047: Fasteners - Torque/clamp force testing
- ASTM F1941/F1941M: Standard specification for electrodeposited coatings on mechanical fasteners
- CQI-11: Plating System Assessment (AIAG)
- ISO 965 (Parts 1-3): Metric screw threads tolerances
- ISO 3269: Fastener inspection - sampling procedures
- ISO 1891-2: Fasteners - Terminology - Vocabulary and definitions for coatings
By implementing ISO/TS 25393, organizations can ensure comprehensive and rigorous assessment of fastener coating systems, supporting compliance, reliability, and international market access.
Relations
- Consolidates
ISO 340:2022 - Conveyor belts — Laboratory scale flammability characteristics — Requirements and test method - Effective Date
- 07-Jan-2025
Buy Documents
ISO/DTS 25393 - Fasteners — Coating system assessment — Complementary and additional aspects to CQI-11
REDLINE ISO/DTS 25393 - Fasteners — Coating system assessment — Complementary and additional aspects to CQI-11
ISO/DTS 25393 - Fixations — Évaluation des systèmes de revêtement électrolytiques — Aspects complémentaires et additionnels au CQI-11
Frequently Asked Questions
ISO/TS 25393 is a draft published by the International Organization for Standardization (ISO). Its full title is "Fasteners — Coating system assessment — Complementary and additional aspects to CQI-11". This standard covers: This document deals with electroplating process evaluation for fasteners, including fastener expected coating properties. This document is a complement to CQI-11 in order to deal with fastener specific aspects not fully covered by CQI-11, and to clarify some questions/items when they are not fully suitable for fasteners. This document is a guide applicable to all parties involved in the supply chain for coated fasteners, i.e. fastener manufacturers, chemical suppliers, electroplaters and purchasers. The requirements for electroplating fasteners specified in this document are essentially based on ISO 4042, ISO/TR 20491 and ISO 16047. NOTE Requirements for electroplating fasteners are also given in ASTM F1941/F1941M.
This document deals with electroplating process evaluation for fasteners, including fastener expected coating properties. This document is a complement to CQI-11 in order to deal with fastener specific aspects not fully covered by CQI-11, and to clarify some questions/items when they are not fully suitable for fasteners. This document is a guide applicable to all parties involved in the supply chain for coated fasteners, i.e. fastener manufacturers, chemical suppliers, electroplaters and purchasers. The requirements for electroplating fasteners specified in this document are essentially based on ISO 4042, ISO/TR 20491 and ISO 16047. NOTE Requirements for electroplating fasteners are also given in ASTM F1941/F1941M.
ISO/TS 25393 is classified under the following ICS (International Classification for Standards) categories: 21.060.01 - Fasteners in general. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO/TS 25393 has the following relationships with other standards: It is inter standard links to ISO 340:2022. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO/TS 25393 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
FINAL DRAFT
Technical
Specification
ISO/DTS 25393
ISO/TC 2/SC 14
Fasteners — Coating system
Secretariat: DIN
assessment — Complementary and
Voting begins on:
additional aspects to CQI-11
2026-06-24
Fixations — Évaluation des systèmes de revêtement
Voting terminates on:
électrolytiques — Aspects complémentaires et additionnels au
2026-09-16
CQI-11
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
ISO/CEN PARALLEL PROCESSING 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/DTS 25393:2026(en) © ISO 2026
FINAL DRAFT
ISO/DTS 25393:2026(en)
Technical
Specification
ISO/DTS 25393
ISO/TC 2/SC 14
Fasteners — Coating system
Secretariat: DIN
assessment — Complementary and
Voting begins on:
additional aspects to CQI-11
Fixations — Évaluation des systèmes de revêtement
Voting terminates on:
électrolytiques — Aspects complémentaires et additionnels au
CQI-11
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 2026
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
ISO/CEN PARALLEL PROCESSING
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/DTS 25393:2026(en) © ISO 2026
ii
ISO/DTS 25393:2026(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Application of CQI-11 to fasteners . 1
4.1 Applicability .1
4.2 Prevention of hydrogen embrittlement .2
5 Additional important items not dealt with in CQI-11, but in ISO 4042 and/or other
relevant technical specification(s) . 9
Annex A (informative) Chemical composition and coating thickness .10
Annex B (informative) Gaugeability and assemblability .12
Annex C (informative) Torque/clamp force testing. 14
Annex D (informative) Corrosion tests . 16
Bibliography .18
iii
ISO/DTS 25393:2026(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 2, Fasteners, Subcommittee SC 14, Surface
coatings, in collaboration with the European Committee for Standardization (CEN) Technical Committee
CEN/TC 185, Fasteners, in accordance with the Agreement on technical cooperation between ISO and CEN
(Vienna Agreement).
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
ISO/DTS 25393:2026(en)
Introduction
rd
Plating system assessment (CQI-11) 3 edition was developed by AIAG (Automotive Industry Action Group)
with the intent to help better evaluation of the quality systems in place at plating shops supplying OEM
automotive coatings such as zinc and zinc alloy electrodeposits, decorative plating applied to metal or
plastic substrates, and hard chromium deposits, as well as electroless nickel and electropolishing processes.
The objective of the 3rd edition of CQI-11 was to update as needed, improve document clarity, and include
the ISO 9001 and IATF 16949:2016 Quality Management System concepts of “Process Approach” and “Risk
Management”.
The Automotive Industry Action Group (AIAG) was founded in 1982 by representatives of the three largest
North American automotive manufacturers: Ford, General Motors and Chrysler. It was originally created
to develop recommendations and a framework for the improvement of quality in the North-American
automotive industry. Among others, the AIAG publishes automotive industry standards, including
Production Part Approval Process (PPAP) quality specifications. These documents have become a de
facto quality standard in North America that have to be complied with by all Tier I suppliers. Increasingly,
these suppliers are now requiring complete compliance from their suppliers, so that many Tier II and III
automotive suppliers now shall also comply.
rd
CQI-11 is intended to be a self-Assessment auditing tool for electroplating processes, and its 3 edition
was published by AIAG in 2019; its goal is that “… all customer engineering design record and specification
requirements are properly understood by the supplier and that the process has the potential to produce product
consistently meeting these requirements during an actual production run at the quoted production rate." CQI-11
is used in the automotive supply chain to establish confidence in component suppliers and their production
processes.
However, CQI-11 remains a general system assessment for plating automotive parts. For the purpose of
fastener coating and in order to achieve the expected functional properties of the fasteners as specified in
ISO 4042, some specific modulus should also be considered additionally to CQI-11 and/or some “questions/
items” need to be completed.
The purpose of this document is to specifically address fastener-specific aspects not fully covered by CQI-11,
and to clarify some questions/items when its content is not applicable or not suitable for fasteners.
This document should be used as guidance by the electroplaters additionally to CQI-11, for the appropriate
application to fasteners.
This document is primarily established from the following basic documents:
— ISO 4042, Fasteners — Electroplated coating systems;
— ISO/TR 20491, Fasteners — Fundamentals of hydrogen embrittlement in steel fasteners;
— ISO 16047, Fasteners — Torque/clamp force testing.
It is consistent with ASTM F1941/F1941M and ASTM B633.
v
FINAL DRAFT Technical Specification ISO/DTS 25393:2026(en)
Fasteners — Coating system assessment — Complementary
and additional aspects to CQI-11
1 Scope
This document deals with electroplating process evaluation for fasteners, including fastener expected
coating properties.
This document is a complement to CQI-11 in order to deal with fastener specific aspects not fully covered by
CQI-11, and to clarify some questions/items when they are not fully suitable for fasteners.
This document is applicable to all parties involved in the supply chain for coated fasteners, i.e. fastener
manufacturers, chemical suppliers, electroplaters and purchasers.
The requirements for electroplating fasteners specified in this document are essentially based on ISO 4042,
ISO/TR 20491 and ISO 16047.
NOTE Requirements for electroplating fasteners are also given in ASTM F1941/F1941M.
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 1891-2, Fasteners — Terminology — Part 2: Vocabulary and definitions for coatings
ISO 4042:2022, Fasteners — Electroplated coating systems
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1891-2 and the following 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/
3.1
rework
action to remove a coating system and to reprocess the targeted coating system
Note 1 to entry: The removal of the initially electrolytically applied coating is usually performed through a stripping
step, using an acid solution.
4 Application of CQI-11 to fasteners
4.1 Applicability
The applicability of CQI-11 requirements to fasteners are denoted as specified in Table 1.
ISO/DTS 25393:2026(en)
Table 1 — Key for Items/Questions in Table 2
AD ADditional item/question not included in CQI-11
SUB Item/question of CQI-11 applicable in principle, but SUBstituted as follows for the purpose of fasteners
NA Item/question of CQI-11 Not Applicable to fasteners, to be replaced by the appropriate question
4.2 Prevention of hydrogen embrittlement
Items specified in Table 2 shall be considered for fasteners.
ISO/DTS 25393:2026(en)
Table 2 — Requirements related to the prevention of Internal Hydrogen Embrittlement (IHE)
CQI-11
Ref. No Item/Question IHE – Requirements for fasteners and comments, if any
(2019)
--- AD2.1 Measures related to internal hydrogen embrittlement ISO 4042:2022, 4.4
for steel fasteners (if any) shall be documented.
Only steel fasteners with a martensitic structure are concerned. For fasteners with a
bainitic structure, a written agreement between the supplier and the purchaser with
regard to IHE is necessary.
--- AD2.2 Baking process for fasteners (if any) shall be document- ISO 4042:2022, 4.4 and 4.5
ed.
Supplemental process verification (if any) shall be doc-
umented with regards to IHE.
Product testing (if any) shall be documented with
regards to IHE.
--- AD2.2.1 Steel fasteners with ISO metric external thread Extract of ISO 4042:2022
Table 3 — Measures related to IHE for fasteners in accordance with ISO 898 1
Property class <10.9 10.9 12.9/12.9
A B C
No supplemen- Supplemental Supplemental
tal process process process
verification or verification verification and/
product and/or product or product
testing with testing with testing with re-
regard to IHE regard to IHE gard to IHE
Measures related
AND OR AND
to IHE
No baking nec-
a, b
Baking Baking
essary
At the choice
— of the fastener —
manufacturer
See 4.4.3 and
See 4.4.2 See 4.4.4 and B.6
B.6
a
For alkaline zinc-nickel electroplatings with nickel content of
12 % to 16 %, the decision to not carry out baking shall be based on test-
ing (see B.6) and be agreed between the supplier and the purchaser.
b
For baking temperature and duration, see B.4.
--- AD2.2.2 Steel nuts Extract of ISO 4042:2022
Table 4 — Measures related to IHE for nuts in accordance with ISO 898-2
ISO/DTS 25393:2026(en)
Table 2 (continued)
CQI-11
Ref. No Item/Question IHE – Requirements for fasteners and comments, if any
(2019)
Property class ≤12
A
No supplemental process verification
or product testing with regard to IHE
Measures related
to IHE AND
a, b
No baking necessary
See 4.4.2
a
Investigations have shown that tensile stress in critical areas of
nuts (including nuts with flange) is always lower than tensile stress in the
thread of the mating bolts, screws or studs with corresponding property
class (see measures related to IHE in Table 3); nuts in accordance with
ISO 898-2 (all property classes) always have a hardness less than 390 HV,
therefore baking is not necessary.
b
For all-metal prevailing torque nuts of property classes 10 and 12,
supplemental process verification or baking is required, at the choice of
the manufacturer.
--- AD2.2.3 Steel washers Extract of ISO 4042:2022
Table 5 — Measures related to IHE for flat washers in accordance with ISO 898-3
Property class ≤300 HV 380 HV
A B
No supplemental Supplemental process
process verifica- verification and/or product
tion testing with regard to IHE
or product testing
with regard to IHE
Measures related
AND OR
to IHE
b
No baking neces- Baking
a
sary
At the choice of the
—
fastener manufacturer
See 4.4.2 See 4.4.3
ISO/DTS 25393:2026(en)
Table 2 (continued)
CQI-11
Ref. No Item/Question IHE – Requirements for fasteners and comments, if any
(2019)
a
When flat washers of property class 300 HV are to be used in
special applications (e.g. enlarged or slotted holes) where bending stress
may be present, baking may be necessary and shall be required by the
purchaser at the time of the order. For baking temperature and duration,
see B.4.
a
When flat washers of property class 380 HV are to be used in spe-
cial applications (e.g. enlarged or slotted holes) where bending stress may
be present, baking is necessary and shall be required by the purchaser at
the time of the order. For baking temperature and duration, see B.4.
For non-flat washers with hardness above 300 HV, a written agreement between the
supplier and the purchaser with regard to IHE is necessary.
--- AD2.2.4 Case hardened screws not designed for high clamp Extract of ISO 4042:2022
force
(e.g. tapping screws, thread-forming, self-drilling Table 6 — Measures related to IHE for case-hardened screws
screws, screws for soft materials such as plastic or typically not designed for high clamp force
wood, etc.)
Core >360 HV and
≤360 HV >390 HV
hardness ≤390 HV
Supplemental
Supplemental Supplemental
process
process process
verification
verification with verification with
with regard to
regard to IHE regard to IHE
IHE
OR AND
a
Product testing Baking
Measures related
to IHE
OR AND
Product test-
Product testing
ing
for each
and/or baking
Baking
manufacturing
b
lot
At the choice of the fastener manu-
—
facturer
a
For baking temperature and duration, see B.4.
b
For alkaline zinc-nickel electroplatings with nickel content of 12 %
to 16 %, product testing shall be considered as part of in-process control (not
mandatory for each manufacturing lot).
ISO/DTS 25393:2026(en)
Table 2 (continued)
CQI-11
Ref. No Item/Question IHE – Requirements for fasteners and comments, if any
(2019)
--- AD2.2.5 Case hardened screws intended to be preloaded Extract of ISO 4042:2022
(e.g. screws forming their ISO metric mating threads Table 7 — Measures related to IHE for case-hardened and tempered screws
according to ISO 965-1, thread-forming or self-drilling intended to be preloaded
screws, screws designed for timber construction)
Core >360 HV and
≤360 HV >390 HV
hardness ≤390 HV
Supplemental
Supplemental Supplemental
process
process process
verification
verification with verification with
with regard to
regard to IHE regard to IHE
IHE
OR AND AND
a a
Product testing Baking Baking
Measures related
OR AND
to IHE
Product testing
for each
Baking
manufacturing
b
lot
Product test-
At the choice of
ing solely at
the fastener man- —
the manufac-
ufacturer
turer’s choice
a
For baking temperature and duration, see B.4.
b
For alkaline zinc-nickel electroplatings with nickel content of
12 % to 16 %, product testing shall be considered as part of in-process
control (not mandatory for each manufacturing lot).
H1.1 2.3 “Process must be in place that limits the acid immer- A
...
ISO/DTS 25393:2026(en)
ISO/TC 2/SC 14
Secretariat: DIN
Date: 2026-05-23xx
Fasteners — Coating system assessment — Complementary and
additional aspects to CQI-11
Fixations — Évaluation des systèmes de revêtement électrolytiques — Aspects complémentaires et additionnels
au CQI-11
TThhiis drs draafftt i is s susubbmmiitttteed d ttoo aa ppaarraallellel l vvoottee i inn IISSOO,, CCEEN.N.
ISO/DTS 25393:(en)
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 8CH-1214 Vernier, Geneva
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO/DTS 25393:(en)
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Application of CQI-11 to fasteners . 2
4.1 Applicability . 2
4.2 Prevention of hydrogen embrittlement . 2
5 Additional important items not dealt with in CQI-11, but in ISO 4042 and/or other
relevant technical specification(s) . 11
Annex A (informative) Chemical composition and coating thickness . 12
Annex B (informative) Gaugeability and assemblability . 14
Annex C (informative) Torque/clamp force testing . 16
Annex D (informative) Corrosion tests . 18
Bibliography . 20
iii
ISO/DTS 25393:(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 2, Fasteners, Subcommittee SC 14, Surface
coatings., in collaboration with the European Committee for Standardization (CEN) Technical Committee
CEN/TC 185, Fasteners, in accordance with the Agreement on technical cooperation between ISO and CEN
(Vienna Agreement).
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
ISO/DTS 25393:(en)
Introduction
rd
Plating System Assessmentsystem assessment (CQI-11) 3 edition was developed by AIAG (Automotive
Industry Action Group) with the intent to help better evaluation of the quality systems in place at plating shops
supplying OEM automotive coatings such as zinc and zinc alloy electrodeposits, decorative plating applied to
metal or plastic substrates, and hard chromium deposits, as well as electroless nickel and electropolishing
processes. The objective of the 3rd edition of CQI-11 was to update as needed, improve document clarity, and
include the ISO 9001 and IATF 16949:2016 Quality Management System concepts of “Process Approach” and
“Risk Management”.
The Automotive Industry Action Group (AIAG) was founded in 1982 by representatives of the three largest
North American automotive manufacturers: Ford, General Motors and Chrysler. It was originally created to
develop recommendations and a framework for the improvement of quality in the North-American
automotive industry. Among others, the AIAG publishes automotive industry standards, including Production
Part Approval Process (PPAP) quality specifications. These documents have become a de facto quality
standard in North America that have to be complied with by all Tier I suppliers. Increasingly, these suppliers
are now requiring complete compliance from their suppliers, so that many Tier II and III automotive suppliers
now shall also comply.
rd
CQI-11 is intended to be a self-Assessment auditing tool for electroplating processes, and its 3 edition was
published by AIAG in 2019; its goal is that “… all customer engineering design record and specification
requirements are properly understood by the supplier and that the process has the potential to produce product
consistently meeting these requirements during an actual production run at the quoted production rate." CQI-11
is used in the automotive supply chain to establish confidence in component suppliers and their production
processes.
However, CQI-11 remains a general system assessment for plating automotive parts. For the purpose of
fastener coating and in order to achieve the expected functional properties of the fasteners as specified in
ISO 4042, some specific modulus should also be considered additionally to CQI-11 and/or some
“questions/items” need to be completed.
The purpose of this ISO Technical Specification (ISO/TS)document is to specifically address fastener-specific
aspects not fully covered by CQI-11, and to clarify some questions/items when its content is not applicable or
not suitable for fasteners.
This ISO Technical Specification shalldocument should be used as a guideguidance by the electroplaters
additionally to CQI-11, for the appropriate application to fasteners.
This document is primarily established from the following basic documents:
— — ISO 4042, Fasteners — Electroplated coating systems, which was revised and published in 2022;
— — ISO/TR 20491, Fasteners — Fundamentals of hydrogen embrittlement in steel fasteners;
— — ISO 16047, Fasteners — Torque/clamp force testing.
It is consistent with ASTM F1941/F1941M and ASTM B633.
v
ISO/DTS 25393:(en)
Fasteners — Coating system assessment — Complementary and
additional aspects to CQI-11
1 Scope
This document deals with electroplating process evaluation for fasteners, including fastener expected coating
properties.
This document is a complement to CQI-11 in order to deal with fastener specific aspects not fully covered by
CQI-11, and to clarify some questions/items when they are not fully suitable for fasteners.
This document is a guide applicable to all parties involved in the supply chain for coated fasteners, i.e. fastener
manufacturers, chemical suppliers, electroplaters and purchasers.
The requirements for electroplating fasteners specified in this document are essentially based on ISO 4042,
ISO/TR 20491 and ISO 16047.
NOTE Requirements for electroplating fasteners are also given in ASTM F1941/F1941M.
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 965-1, ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data
ISO 965-2, ISO general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for internal and
external threads (tolerance classes 6H and 6g for M1,6 to M100 and 5H and 6h for M1 to M1,4)
ISO 965-3, ISO general purpose metric screw threads — Tolerances — Part 3: Limit deviations for screw threads
ISO 1891--2, Fasteners — Terminology — Part 2: Vocabulary and definitions for coatings
ISO 4042:2022, Fasteners — Electroplated coating systems
rd
CQI-11, 3 edition (2019), Special Process: Plating System Assessment [AIAG, Automotive Industry Action Group]
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1891-2 and the following 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/
3.1 3.1
rework
action to remove a coating system and to reprocess the targeted coating system
Note 1 to entry: The removal of the initially electrolytically applied coating is usually performed through a stripping
step, using an acid solution.
ISO/DTS 25393:(en)
4 Application of CQI-11 to fasteners
4.1 Applicability
The applicability of CQI-11 requirements to fasteners are denoted as specified in Table 1Table 1.
Table 1 — Key for Items/Questions in Table 2Table 2
AD ADditional item/question not included in CQI-11
SUB Item/question of CQI-11 applicable in principle, but SUBstituted as follows for the purpose of fasteners
NA Item/question of CQI-11 Not Applicable to fasteners, to be replaced by the appropriate question
4.2 Prevention of Hydrogen Embrittlementhydrogen embrittlement
Items specified in Table 2Table 2 shall be considered for fasteners.
ISO/DTS 25393:(en)
Table 2 — Requirements related to the prevention of Internal Hydrogen Embrittlement (IHE)
CQI-
11 Ref.
Item / /Question IHE – Requirements for fasteners and comments, if any
(201 No
9)
--- AD2.1 Measures related to internal hydrogen embrittlement for ISO 4042:2022, 4.4
steel fasteners (if any) shall be documented.
Only steel fasteners with a martensitic structure are concerned. For fasteners with a bainitic
structure, a written agreement between the supplier and the purchaser with regard to IHE is
necessary.
--- AD2.2 Baking process for fasteners (if any) shall be documented. ISO 4042:2022, 4.4 and 4.5
Supplemental process verification (if any) shall be
documented with regards to IHE.
Product testing (if any) shall be documented with regards to
IHE.
--- AD2.2. Steel fasteners with ISO metric external thread Extract of ISO 4042:2022
Table 3 — Measures related to IHE for fasteners in accordance with ISO 898 1
Property class < 10.9 10.9 12.9/12.9
A B C
No
Supplemental Supplemental
supplemental
process process
process
verification verification and/or
verification or
and/or product product
Measures related
product
testing with testing with regard
to IHE
testing with
regard to IHE to IHE
regard to IHE
AND OR AND
No baking
a, b
Baking Baking
necessary
ISO/DTS 25393:(en)
CQI-
11 Ref.
Item / /Question IHE – Requirements for fasteners and comments, if any
(201 No
9)
At the choice of
— the fastener —
manufacturer
See 4.4.2 See 4.4.3 and B.6 See 4.4.4 and B.6
a
For alkaline zinc-nickel electroplatings with nickel content of
12 % to 16 %, the decision to not carry out baking shall be based on testing (see
B.6) and be agreed between the supplier and the purchaser.
b
For baking temperature and duration, see B.4.
--- AD2.2. Steel nuts Extract of ISO 4042:2022
Table 4 — Measures related to IHE for nuts in accordance with ISO 898-2
Property class ≤ 12
A
No supplemental process verification
or product testing with regard to IHE
Measures related
to IHE AND
a, b
No baking necessary
See 4.4.2
a
Investigations have shown that tensile stress in critical areas of
nuts (including nuts with flange) is always lower than tensile stress in the thread
of the mating bolts, screws or studs with corresponding property class (see
measures related to IHE in Table 3); nuts in accordance with ISO 898-2 (all
property classes) always have a hardness less than 390 HV, therefore baking is
not necessary.
ISO/DTS 25393:(en)
CQI-
11 Ref.
Item / /Question IHE – Requirements for fasteners and comments, if any
(201 No
9)
b
For all-metal prevailing torque nuts of property classes 10 and
12, supplemental process verification or baking is required, at the choice of the
manufacturer.
--- AD2.2. Steel washers Extract of ISO 4042:2022
Table 5 — Measures related to IHE for flat washers in accordance with ISO 898-3
Property class ≤ 300 HV 380 HV
A B
No supplemental Supplemental process
process verification and/or product
verification testing with regard to IHE
or product testing
with regard to IHE
Measures related
AND OR
to IHE
b
No baking Baking
a
necessary
At the choice of the
—
fastener manufacturer
See 4.4.2 See 4.4.3
a
When flat washers of property class 300 HV are to be used in
special applications (e.g. enlarged or slotted holes) where bending stress may be
present, baking may be necessary and shall be required by the purchaser at the
time of the order. For baking temperature and duration, see B.4.
a
When flat washers of property class 380 HV are to be used in
special applications (e.g. enlarged or slotted holes) where bending stress may be
ISO/DTS 25393:(en)
CQI-
11 Ref.
Item / /Question IHE – Requirements for fasteners and comments, if any
(201 No
9)
present, baking is necessary and shall be required by the purchaser at the time of
the order. For baking temperature and duration, see B.4.
For non-flat washers with hardness above 300 HV, a written agreement between the supplier
and the purchaser with regard to IHE is necessary.
--- AD2.2. Case hardened screws not designed for high clamp force Extract of ISO 4042:2022
(e.g. tapping screws, thread-forming, self-drilling screws, Table 6 — Measures related to IHE for case-hardened screws
screws for soft materials such as plastic or wood, etc.) typically not designed for high clamp force
Core > 360 HV and
≤ 360 HV > 390 HV
hardness ≤ 390 HV
Supplemental
Supplemental Supplemental
process
process process
verification
verification with verification with
with regard to
regard to IHE regard to IHE
IHE
OR AND
a
Product testing Baking
Measures related
to IHE
OR AND
Product
testing
Product testing
and/or baking
for each
Baking
manufacturing lot
b
At the choice of the fastener
—
manufacturer
a
For baking temperature and duration, see B.4.
ISO/DTS 25393:(en)
CQI-
11 Ref.
Item / /Question IHE – Requirements for fasteners and comments, if any
(201 No
9)
b
For alkaline zinc-nickel electroplatings with nickel content of
12 % to 16 %, product testing shall be considered as part of in-process control
(not mandatory for each manufacturing lot).
--- AD2.2. Case hardened screws intended to be preloaded Extract of ISO 4042:2022
(e.g. screws forming their ISO metric mating threads Table 7 — Measures related to IHE for case-hardened and tempered screws
according to ISO 965-1, thread-forming or self-drilling intended to be preloaded
screws, screws designed for timber construction)
Core > 360 HV and
≤ 360 HV > 390 HV
hardness ≤ 390 HV
Supplemental
Supplemental Supplemental
process
process process
verification
verification with verification with
with regard to
regard to IHE regard to IHE
IHE
OR AND AND
a a
Product testing Baking Baking
Measures related
OR AND
to IHE
Product testing
for each
Baking
manufacturing lot
b
At the choice of the
Product
fastener —
testing solely
manufacturer
at the
ISO/DTS 25393:(en)
CQI-
11 Ref.
Item / /Question IHE – Requirements for fasteners and comments, if any
(201 No
9)
manufacturer’
s choice
a
For baking temperature and duration, see B.4.
b
For alkaline zinc-nickel electroplatings with nickel content of
12 % to 16 %, product testing shall be considered as part of in-process control
(not mandatory for each manufacturing lot).
H1.1 2.3 “Process must be in place that limits the acid immersion Applicable.
time in the plating process”.
Reprinted from CQI-11 with permission of AIAG
(Automotive Industry Action Group)
H1.1 SUB2.4 Pickling duration SUB2.4 (see ISO 4042:2022, B.3)
A.2.4 NOT APPLICABLE: “Requirement: no more than 10 minutes.
If more than 10 minutes, parts need to be quarantined and
NA
follow customer reaction plan”
Reprinted from CQI-11 with permission of AIAG Acid pickling duration, if any, shall not exceed the time required for adequate surface
(Automotive Industry Action Group) preparation.
Acid pickling duration should be recorded.
To be replaced by SUB2.4 for fasteners
Adequate inhibitor shall be used, and effectiveness of inhibition should be controlled.
H1.2 SUB2.5 NOT APPLICABLE: “All parts for hydrogen embrittlement SUB2.5 (see ISO 4042:2022, B.4)
relief must r
...
PROJET FINAL
Spécification
technique
ISO/DTS 25393
ISO/TC 2/SC 14
Fixations — Évaluation des
Secrétariat: DIN
systèmes de revêtement
Début de vote:
électrolytiques — Aspects
2026-06-24
complémentaires et additionnels au
Vote clos le:
CQI-11
2026-09-16
Fasteners — Coating system assessment — Complementary and
additional aspects to CQI-11
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
PROJETS DE NORMES
TRAITEMENT PARALLÈLE ISO/CEN
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
NORMES POUVANT
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
Numéro de référence
ISO/DTS 25393:2026(fr) © ISO 2026
PROJET FINAL
ISO/DTS 25393:2026(fr)
Spécification
technique
ISO/DTS 25393
ISO/TC 2/SC 14
Fixations — Évaluation des
Secrétariat: DIN
systèmes de revêtement
Début de vote:
électrolytiques — Aspects
2026-06-24
complémentaires et additionnels au
Vote clos le:
CQI-11
2026-09-16
Fasteners — Coating system assessment — Complementary and
additional aspects to CQI-11
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
DOCUMENT PROTÉGÉ PAR COPYRIGHT
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
© ISO 2026 INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
PROJETS DE NORMES
TRAITEMENT PARALLÈLE ISO/CEN
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
NORMES POUVANT
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse Numéro de référence
ISO/DTS 25393:2026(fr) © ISO 2026
ii
ISO/DTS 25393:2026(fr)
Sommaire Page
Avant-propos .iv
Introduction .v
1 Domaine d'application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Application du CQI-11 aux fixations . 2
4.1 Champ d’application .2
4.2 Prévention de la fragilisation par l'hydrogène .2
5 Points importants additionnels non traités dans le CQI-11, mais dans l'ISO 4042 et/ou
une ou plusieurs autres spécifications techniques pertinentes . 9
Annexe A (informative) Composition chimique et épaisseur du revêtement .10
Annexe B (informative) Aptitude au contrôle par calibre du filetage et aptitude à l'assemblage .12
Annexe C (informative) Essais couple/tension . 14
Annexe D (informative) Essais de corrosion . .16
Bibliographie .18
iii
ISO/DTS 25393:2026(fr)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux
de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général
confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de
faire partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales
et non gouvernementales, en liaison avec l'ISO participent également aux travaux. L'ISO collabore
étroitement avec la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation
électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document a
été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir
www.iso.org/directives).
L’ISO attire l’attention sur le fait que la mise en application du présent document peut entraîner l’utilisation
d’un ou de plusieurs brevets. L'ISO ne prend pas position quant à la preuve, à la validité et à l'applicabilité de
tout droit de propriété revendiqué à cet égard. À la date de publication du présent document, l'ISO n'avait pas
reçu notification qu'un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois,
il y a lieu d’avertir les responsables de la mise en application du présent document que des informations
plus récentes sont susceptibles de figurer dans la base de données de brevets, disponible à l'adresse
www.iso.org/brevets. L’ISO ne saurait être tenue pour responsable de ne pas avoir identifié tout ou partie de
tels droits de brevet.
Les appellations commerciales éventuellement mentionnées dans le présent document sont données pour
information, par souci de commodité, à l'intention des utilisateurs et ne sauraient constituer un engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion de
l'ISO aux principes de l'Organisation mondiale du commerce (OMC) concernant les obstacles techniques au
commerce (OTC), voirwww.iso.org/avant-propos.
Le présent document a été élaboré par le Comité technique ISO/TC 2, Fixations, sous-comité SC 14,
Revêtements de surface, en collaboration avec le Comité technique CEN/TC 185, Fixations, du Comité européen
de normalisation (CEN), conformément à l'Accord de coopération technique entre l'ISO et le CEN (Accord de
Vienne).
Il convient que l'utilisateur adresse tout retour d'information ou toute question concernant le présent
document à l'organisme national de normalisation de son pays. Une liste exhaustive desdits organismes se
trouve à l'adresse www.iso.org/members.html.
iv
ISO/DTS 25393:2026(fr)
Introduction
e
La 3 édition de l'évaluation des systèmes de revêtement électrolytiques (CQI-11) a été élaborée par l'AIAG
(Automotive Industry Action Group) dans l'intention de contribuer à une meilleure évaluation des systèmes
qualité en place dans les ateliers de revêtements électrolytiques fournissant des revêtements de pièces
automobiles d'origine, tels que les dépôts électrolytiques de zinc et d'alliages de zinc, les revêtements
décoratifs appliqués sur des substrats métalliques ou plastiques, et les dépôts de chrome dur, ainsi que
e
les procédés de nickel chimique et d’électropolissage. L'objectif de la 3 édition du CQI-11 était de mettre
à jour si nécessaire, d'améliorer la clarté du document, et d'inclure les concepts d'« Approche processus »
et de «Management du risque», rattachés aux Systèmes de management de la qualité de l'ISO 9001 et de
l'IATF 16949:2016.
L'Automotive Industry Action Group (AIAG) a été fondé en 1982 par des représentants des trois plus grands
constructeurs automobiles nord-américains: Ford, General Motors et Chrysler. Il a été créé à l'origine
pour formuler des recommandations et établir un référentiel visant à améliorer la qualité dans l'industrie
automobile nord-américaine. L'AIAG publie, entre autres, des normes pour l'industrie automobile, et
notamment les spécifications de qualité du processus d'homologation des pièces de production (Production
Part Approval Process - PPAP). Ces documents sont devenus des normes de qualité de facto en Amérique
du Nord, auxquelles tous les fournisseurs de rang I doivent se conformer. De plus en plus, ces fournisseurs
exigent désormais une conformité complète de la part de leurs propres fournisseurs, de sorte que de
nombreux fournisseurs automobiles de Rang II et III doivent désormais également s'y conformer.
Le CQI-11 est conçu pour servir d’outil d'audit et d'auto-évaluation pour les procédés de galvanoplastie, et
e
sa 3 édition a été publiée par l'AIAG en 2019; son but est que «… toutes les exigences relatives aux dossiers
de conception et aux spécifications du client soient correctement comprises par le fournisseur et que le procédé
permette de fabriquer un produit répondant systématiquement à ces exigences au cours d'un cycle de production
réel et au rythme de production spécifié». Le CQI-11 est utilisé dans la chaîne d'approvisionnement automobile
afin d'établir un niveau de confiance envers les fournisseurs de composants et leurs procédés de production.
Toutefois, le CQI-11 demeure une procédure d'évaluation générale des systèmes de revêtements
électrolytiques des pièces automobiles. Pour les besoins de revêtement des fixations et afin d'obtenir les
caractéristiques fonctionnelles attendues des fixations telles que spécifiées dans l'ISO 4042, il convient
également de prendre en compte certains modules spécifiques en plus du CQI-11 et/ou de traiter un certain
nombre de «questions/points» nécessaires.
L'objet du présent document est de traiter spécifiquement les aspects propres aux fixations qui ne sont pas
entièrement couverts par le CQI-11, et de clarifier certaines questions/certains points lorsque leur contenu
ne s'applique pas ou n'est pas adapté aux fixations.
Il convient que le présent document serve de recommandation aux applicateurs de revêtements
électrolytiques en complément du CQI-11, pour l'application appropriée sur des fixations.
Le présent document est principalement élaboré à partir des documents de base suivants:
— ISO 4042, Fixations — Systèmes de revêtements électrolytiques;
— ISO/TR 20491, Fixations — Principes de la fragilisation par l'hydrogène pour les fixations en acier;
— ISO 16047, Éléments de fixation — Essais couple/tension.
Il est cohérent avec les ASTM F1941/F1941M et ASTM B633.
v
PROJET FINAL Spécification technique ISO/DTS 25393:2026(fr)
Fixations — Évaluation des systèmes de revêtement
électrolytiques — Aspects complémentaires et additionnels
au CQI-11
1 Domaine d'application
Le présent document traite de l'évaluation des procédés de galvanoplastie pour les fixations, y compris les
caractéristiques attendues des revêtements des fixations.
Le présent document vient en complément du CQI-11 afin de traiter d'aspects propres aux fixations qui ne
sont pas entièrement couverts par le CQI-11, et de clarifier certaines questions / certains points lorsqu'ils ne
sont pas parfaitement adaptés aux fixations.
Le présent document est applicable à toutes les parties de la chaîne d'approvisionnement pour des fixations
revêtues, c’est-à-dire les fabricants de fixations, les fournisseurs de produits chimiques, les applicateurs de
revêtements électrolytiques et les acheteurs.
Les exigences relatives à la galvanoplastie de fixations spécifiées dans le présent document sont
essentiellement basées sur l'ISO 4042, l'ISO/TR 20491 et l'ISO 16047.
NOTE Les exigences relatives à la galvanoplastie de fixations sont également données dans l'ASTM F1941/
F1941M.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu'ils constituent, pour tout ou partie de leur
contenu, des exigences du présent document. Pour les références datées, seule l'édition citée s'applique. Pour
les références non datées, la dernière édition du document de référence s'applique (y compris les éventuels
amendements).
ISO 1891-2, Fixations — Terminologie — Partie 2: Vocabulaire et définitions pour les revêtements
ISO 4042:2022, Fixations — Systèmes de revêtements électrolytiques
3 Termes et définitions
Pour les besoins du présent document, les termes et définitions donnés dans l'ISO 1891-2 ainsi que les
suivants s'appliquent.
L'ISO et l'IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en normalisation,
consultables aux adresses suivantes:
— ISO Online browsing platform: disponible à l'adresse https:// www .iso .org/ obp
— IEC Electropedia: disponible à l'adresse https:// www .electropedia .org/
3.1
retouche
action permettant de retirer un système de revêtement et de réappliquer le système de revêtement souhaité
Note 1 à l'article: Le retrait du revêtement initialement appliqué par procédé électrolytique est généralement effectué
au cours d'une étape de décapage à l'aide d'une solution acide.
ISO/DTS 25393:2026(fr)
4 Application du CQI-11 aux fixations
4.1 Champ d’application
Les des exigences du champ d’application du CQI-11 aux fixations sont indiquées tel que spécifié dans
le Tableau 1.
Tableau 1 — Légende pour les points/questions figurant dans le Tableau 2
AD Point/question ADditionnel non inclus dans le CQI-11
SUB Point/question du CQI-11 applicable en principe, mais remplacé (en anglais, «SUBstituted ») comme suit
pour les besoins des fixations
NA Point/question du CQI-11 Non Applicable aux fixations, devant être remplacé par la question appropriée
4.2 Prévention de la fragilisation par l'hydrogène
Les points spécifiés dans le Tableau 2 doivent être pris en considération pour les fixations.
ISO/DTS 25393:2026(fr)
Tableau 2 — Exigences relatives à la prévention de la Fragilisation par l'hydrogène interne (IHE)
CQI-11
N° réf. Point/Question IHE – Exigences relatives aux fixations et commentaires, le cas échéant
(2019)
–- AD2.1 Les mesures relatives à la fragilisation par l'hydrogène interne ISO 4042:2022, 4.4
pour les fixations en acier (le cas échéant) doivent être docu-
Seules les fixations en acier avec une structure martensitique sont concernées. Pour les fixations
mentées.
présentant une structure bainitique, un accord écrit est nécessaire entre le client et le fournisseur
par rapport à l'IHE.
–- AD2.2 Le procédé de dégazage pour les fixations (le cas échéant) doit ISO 4042:2022, 4.4 et 4.5
être documenté.
La vérification supplémentaire du procédé (le cas échéant) doit
être documentée par rapport à l'IHE.
L'essai produit (le cas échéant) doit être documenté par rapport
à l'IHE.
–- AD2.2.1 Fixations en acier à filetage extérieur métrique ISO Extrait de l'ISO 4042:2022
Tableau 3 — Mesures relatives à l'IHE pour les fixations conformes à l'ISO 898-1
Classe de qualité < 10.9 10.9 12.9/12.9
A B C
Aucune vérifica- Vérification sup-
Vérification supplé-
tion supplémen- plémentaire
mentaire
taire du procédé du procédé et/ou
du procédé et/ou
ou essai produit
essai produit
essai produit par par rapport à
par rapport à l'IHE
rapport à l'IHE l'IHE
Mesures relatives à
l'IHE
ET OU ET
Aucun dégazage
a, b
Dégazage Dégazage
nécessaire
Au choix du fabri-
— —
cant de fixations
Voir 4.4.2 Voir 4.4.3 et B.6 Voir 4.4.4 et B.6
a
Pour les revêtements électrolytiques de zinc-nickel alcalin (de teneur en
nickel de 12 % à 16 %), la décision de ne pas effectuer le dégazage doit être basée sur
des essais (voir B.6) et doit faire l'objet d'un accord entre le client et le fournisseur.
b
Pour la température et la durée de dégazage, voir B.4.
–- AD2.2.2 Écrous en acier Extrait de l'ISO 4042:2022
Tableau 4 — Mesures relatives à l'IHE pour les écrous conformes à l'ISO 898-2
Classe de qualité ≤ 12
ISO/DTS 25393:2026(fr)
Tableau 2 (suite)
CQI-11
N° réf. Point/Question IHE – Exigences relatives aux fixations et commentaires, le cas échéant
(2019)
A
Aucune vérification supplémentaire du procédé
ou essai produit par rapport à l'IHE
Mesures relatives à
l'IHE ET
a, b
Aucun dégazage nécessaire
Voir 4.4.2
a
Des études ont montré que les contraintes de traction dans les zones critiques
des écrous (y compris les écrous à embase) sont toujours inférieures aux contraintes
de traction dans le filetage des vis, goujons ou tiges filetées associés de classe de
qualité correspondante (voir les mesures relatives à l'IHE dans le Tableau 3); les
écrous conformes à l'ISO 898-2 (toutes classes de qualité) ont toujours une dureté
inférieure à 390 HV, par conséquent le dégazage n'est pas nécessaire.
b
Pour les écrous autofreinés tout métal de classes de qualité 10 et 12, une
vérification supplémentaire du procédé ou un dégazage est exigé, au choix du fabri-
cant.
–- AD2.2.3 Rondelles en acier Extrait de l'ISO 4042:2022
Tableau 5 — Mesures relatives à l'IHE pour les rondelles de forme plane conformes à
l'ISO 898-3
Classe de qualité ≤ 300 HV 380 HV
A B
Aucune vérification Vérification supplémentaire
supplémentaire du procédé et/ou essai produit
du procédé ou essai par rapport à l'IHE
produit
par rapport à l'IHE
Mesures relatives à
ET OU
l'IHE
b
Aucun dégazage Dégazage
a
nécessaire
Au choix du fabricant
—
de fixations
Voir 4.4.2 Voir 4.4.3
ISO/DTS 25393:2026(fr)
Tableau 2 (suite)
CQI-11
N° réf. Point/Question IHE – Exigences relatives aux fixations et commentaires, le cas échéant
(2019)
a
Lorsque des rondelles de forme plane de classe de qualité 300HV doivent
être utilisées dans des applications spéciales où des contraintes de flexion peuvent
être présentes (par exemple, sur des trous élargis ou oblongs), le dégazage peut
être nécessaire et doit être exigé par le client au moment de la commande. Pour la
température et la durée de dégazage, voir B.4.
b
Lorsque des rondelles de forme plane de classe de qualité 380HV doivent être
utilisées dans des applications spéciales où des contraintes de flexion peuvent être
présentes (par exemple, sur des trous élargis ou oblongs), le dégazage est nécessaire
et doit être exigé par le client au moment de la commande. Pour la température et la
durée de dégazage, voir B.4.
Pour les rondelles de forme non plane avec une dureté supérieure à 300 HV, un accord écrit est
nécessaire entre le client et le fournisseur par rapport à l'IHE.
–- AD2.2.4 Vis cémentées non conçues pour une tension élevée Extrait de l'ISO 4042:2022
(par exemple, vis à tôle, vis qui forment leur propre filetage, Tableau 6 — Mesures relatives à l'IHE pour les vis cémentées non conçues par nature pour
vis autoperceuses, vis pour matériaux tendres tels que le une tension élevée
plastique ou le bois, etc.)
Dureté > 360 HV
≤ 360 HV > 390 HV
à cœur et ≤ 390 HV
Vérification
Vérification sup- Vérification sup-
supplémentaire
plémentaire du plémentaire du
du procédé
procédé procédé
par rapport à
par rapport à l'IHE par rapport à l'IHE
l'IHE
OU ET
Mesures relatives à
a
Essai produit Dégazage
l'IHE
OU ET
Essai produit
Essai produit pour
et/ou dégazage
Dégazage chaque
b
lot de fabrication
Au choix du fabricant de fixations —
a
Pour la température et la durée de dégazage, voir B.4.
b
Pour les revêtements électrolytiques de zinc-nickel alcalin d'une teneur en
nickel de 12 % à 16 %, l'essai produit doit être considéré comme faisant partie du
contrôle en cours de fabrication (non obligatoire pour chaque lot de fabrication).
–- AD2.2.5 Vis cémentées prévues pour être mises sous tension Extrait de l'ISO 4042:2022
ISO/DTS 25393:2026(fr)
Tableau 2 (suite)
CQI-11
N° réf. Point/Question IHE – Exigences relatives aux fixations et commentaires, le cas échéant
(2019)
(par exemple, vis formant leurs filetages métriques ISO selon Tableau 7 — Mesures relatives à l'IHE pour les vis cémentées et revenues prévues pour
l'ISO 965-1, vis autoformeuses ou autoperceuses, vis desti- être mises sous tension
nées à la construction en bois)
Dureté > 360 HV
≤ 360 HV > 390 HV
à cœur et ≤ 390 HV
Vérification
Vérification sup- Vérification sup-
supplémentaire
plémentaire du plémentaire du
du procédé
procédé procédé
par rapport à
par rapport à l'IHE par rapport à l'IHE
l'IHE
OU ET ET
a a
Essai produit Dégazage Dégazage
Mesures relatives à
OU ET
l'IHE
Essai produit pour
Dégazage chaque
b
lot de fabrication
Essai produit
Au choix du fabri- uniquement au
—
cant de fixations choix du fabri-
cant
a
Pour la température et la durée de dégazage, voir B.4.
b
Pour les revêtements électrolytiques de zinc-nickel alcalin d'une teneur en
nickel de 12 % à 16 %, l'essai produit doit être considéré comme faisant partie du
contrôle en cours de fabrication (non obligatoire pour chaque lot de fabrication).
H1.1 2.3 «Un procédé doit être en place qui limite le temps d'immersion Applicable.
dans l'acide durant le procédé de revêtement».
Reproduit à partir du CQI-11 avec l'autorisation de l'AIAG
(Automotive Industry Action Group)
H1.1 SUB2.4 Durée du décapage chimique SUB2.4 (voir l'ISO 4042:2022, B.3)
A.2.4 NON APPLICABLE: «Exigence: pas plus de 10 min. Si la durée
est supérieure à 10 min, il est nécessaire que les pièces soient
NA
mises en quarantaine et suivent un plan de réaction établi
par le client.»
Reproduit à partir du CQI-11 avec l'autorisation de l'AIAG La durée du décapage chimique à l'acide, le cas échéant, ne doit pas dépasser le temps exigé pour
(Automotive Industry Action Group) une préparation adéquate de la surface.
Il convient que la durée du déca
...











