Irish Standard

I.S. EN ISO 4042:2018

Fasteners - Electroplated coating systems

(ISO 4042:2018)
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 I.S. EN ISO 4042:2018

Incorporating amendments/corrigenda/National Annexes issued since publication:

The National Standards Authority of Ireland (NSAI) produces the following categories of formal documents:
I.S. xxx: Irish Standard — national specification based on the consensus of an expert panel and subject to public consultation.

S.R. xxx: Standard Recommendation — recommendation based on the consensus of an expert panel and subject to public consultation.
SWiFT xxx: A rapidly developed recommendatory document based on the consensus of the participants of an NSAI workshop.
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This document replaces/revises/consolidates the NSAI adoption of the document(s) indicated on the
CEN/CENELEC cover/Foreword and the following National document(s):

NOTE: The date of any NSAI previous adoption may not match the date of its original CEN/CENELEC
document.

This document is based on: Published:

EN ISO 4042:2018 2018-09-19

This document was published ICS number:

under the authority of the NSAI
and comes into effect on: 21.060.01

2018-10-07
NOTE: If blank see CEN/CENELEC cover page

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 National Foreword
I.S. EN ISO 4042:2018 is the adopted Irish version of the European Document EN ISO 4042:2018, Fasteners
- Electroplated coating systems (ISO 4042:2018)

This document does not purport to include all the necessary provisions of a contract. Users are responsible
for its correct application.

For relationships with other publications refer to the NSAI web store.

Compliance with this document does not of itself confer immunity from legal obligations.
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In line with international standards practice the decimal point is shown as a comma (,) throughout this
document.
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 I.S. EN ISO 4042:2018

EUROPEAN STANDARD EN ISO 4042

NORME EUROPÉENNE
EUROPÄISCHE NORM September 2018

ICS 21.060.01 Supersedes EN ISO 4042:1999

English Version

Fasteners - Electroplated coating systems (ISO 4042:2018)

Fixations - Systèmes de revêtements électrolytiques Verbindungselemente - Galvanisch aufgebrachte
(ISO 4042:2018) Überzugsysteme (ISO 4042:2018)
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This European Standard was approved by CEN on 4 July 2018.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey 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

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4042:2018 E
worldwide for CEN national Members.
 I.S. EN ISO 4042:2018
EN ISO 4042:2018 (E)

Contents Page

European foreword....................................................................................................................................................... 3
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2
 I.S. EN ISO 4042:2018
EN ISO 4042:2018 (E)

European foreword

This document (EN ISO 4042:2018) has been prepared by Technical Committee ISO/TC 2 "Fasteners" in
collaboration with Technical Committee CEN/TC 185 “Fasteners” the secretariat of which is held by BSI.

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 March 2019, and conflicting national standards shall
be withdrawn at the latest by March 2019.

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 4042:1999.

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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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

Endorsement notice

The text of ISO 4042:2018 has been approved by CEN as EN ISO 4042:2018 without any modification.

3
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 I.S. EN ISO 4042:2018

INTERNATIONAL ISO
STANDARD 4042

Third edition
2018-08

Fasteners — Electroplated coating

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systems
Fixations — Systèmes de revêtements électrolytiques

Reference number
ISO 4042:2018(E)

© ISO 2018
 I.S. EN ISO 4042:2018
ISO 4042:2018(E)

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COPYRIGHT PROTECTED DOCUMENT

© ISO 2018
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
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Published in Switzerland

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 I.S. EN ISO 4042:2018
ISO 4042:2018(E)


Contents Page

Foreword...........................................................................................................................................................................................................................................v
Introduction............................................................................................................................................................................................................................... vii
1 Scope.................................................................................................................................................................................................................................. 1
2 Normative references....................................................................................................................................................................................... 1
3 Terms and definitions...................................................................................................................................................................................... 2
4 General characteristics of the coating............................................................................................................................................. 3
4.1 Coating metals or alloys and main purposes................................................................................................................. 3
4.2 Build-up of basic electroplated coating systems........................................................................................................ 3
4.3 Coating systems and coating processes............................................................................................................................. 4
4.4 Internal hydrogen embrittlement........................................................................................................................................... 4
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4.4.1 General...................................................................................................................................................................................... 4
4.4.2 Fasteners with hardness below 360 HV....................................................................................................... 5
4.4.3 Fasteners with hardness equal to and above 360 HV and up to 390 HV.......................... 5
4.4.4 Fasteners with hardness above 390 HV........................................................................................................ 5
4.4.5 Fasteners in accordance with ISO 898-1, ISO 898-2 and ISO 898-3.................................... 6
4.4.6 Baking and test requirements for case-hardened and tempered screws........................ 7
4.4.7 Work-hardened fasteners.......................................................................................................................................... 8
4.4.8 Fasteners with bainitic structure....................................................................................................................... 8
4.5 Baking.............................................................................................................................................................................................................. 8
5 Corrosion protection and testing......................................................................................................................................................... 8
5.1 General............................................................................................................................................................................................................ 8
5.2 Neutral salt spray test (NSS) for zinc based coating systems.......................................................................... 9
5.3 Sulfur dioxide test (Kesternich test).................................................................................................................................. 10
5.4 Bulk handling, automatic processes such as feeding and/or sorting, storage and
transport..................................................................................................................................................................................................... 11
6 Dimensional requirements and testing......................................................................................................................................11
6.1 General......................................................................................................................................................................................................... 11
6.2 Fasteners with ISO metric thread......................................................................................................................................... 11
6.2.1 Coating thickness.......................................................................................................................................................... 11
6.2.2 Gaugeability and assemblability...................................................................................................................... 12
6.3 Other fasteners..................................................................................................................................................................................... 12
6.4 Test methods for thickness determination................................................................................................................... 13
7 Mechanical and physical properties and testing...............................................................................................................15
7.1 General......................................................................................................................................................................................................... 15
7.2 Appearance.............................................................................................................................................................................................. 15
7.3 Corrosion resistance related to temperature............................................................................................................. 15
7.4 Torque/clamp force relationship.......................................................................................................................................... 15
7.5 Determination of hexavalent chromium......................................................................................................................... 15
8 Applicability of tests.......................................................................................................................................................................................15
8.1 General......................................................................................................................................................................................................... 15
8.2 Tests mandatory for each lot.................................................................................................................................................... 15
8.3 Tests for in-process control....................................................................................................................................................... 16
8.4 Tests to be performed when specified by the purchaser.................................................................................. 16
9 Designation system..........................................................................................................................................................................................16
9.1 General......................................................................................................................................................................................................... 16
9.2 Designation of electroplated coating systems for the order.......................................................................... 17
9.3 Examples of designation of hexavalent chromium free electroplated coating
systems for fasteners....................................................................................................................................................................... 18
9.4 Designation of fasteners with electroplated coating systems for labelling...................................... 19
10 Ordering requirements for electroplating..............................................................................................................................19

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 I.S. EN ISO 4042:2018
ISO 4042:2018(E)


11 Storage conditions............................................................................................................................................................................................20
Annex A (informative) Design aspects and assembly of coated fasteners...................................................................21
Annex B (informative) Hydrogen embrittlement consideration...........................................................................................29
Annex C (informative) Corrosion protection related to zinc coatings with chromate
conversion coatings.........................................................................................................................................................................................33
Annex D (informative) Coating thickness and thread clearance for ISO metric screw threads............34
Annex E (informative) Coating systems tested in accordance with ISO 9227, NSS —
Evaluation of cabinet corrosivity for the neutral salt spray test......................................................................42
Annex F (informative) Obsolete designation codes for electroplated coating systems on
fasteners according to ISO 4042:1999.........................................................................................................................................51
Bibliography.............................................................................................................................................................................................................................. 54
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 I.S. EN ISO 4042:2018
ISO 4042:2018(E)


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 documents 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).
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Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www​.iso​.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on 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 the following
URL: www​.iso​.org/iso/foreword​.html.
This document was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 14, Surface
coatings.
This third edition cancels and replaces the second edition (ISO 4042:1999), which has been technically
revised. The main changes compared to the previous edition are as follows:
— application to all fasteners, including self-tapping and thread forming screws, washers, rivets,
clips, etc.;
— focus on coatings designed for corrosion protection of fasteners;
— application to electroplated coating systems with or without additional layers (conversion coating,
sealant, top coat, lubricant);
— specification of minimum corrosion resistance (white corrosion and red rust);
— inclusion of up-to-date knowledge about hydrogen embrittlement and prevention measures;
— definitions specified in ISO 1891-2;
— concerning corrosion tests, inclusion of sulfur dioxide test (Kesternich) and calibration of neutral
salt spray test;
— inclusion of gaugeability and assemblability requirements;
— for thickness determination, addition of adequate test methods and deletion of the batch average
thickness;
— new designation system for all coating systems;
— specification for mechanical and physical properties and related test methods;
— information about design aspects and assembly of coated fasteners;

© ISO 2018 – All rights reserved  v

 I.S. EN ISO 4042:2018
ISO 4042:2018(E)


— information for coating thickness and thread clearance for ISO metric screw threads;
— information about evaluation of cabinet corrosivity for the neutral salt spray test.
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 I.S. EN ISO 4042:2018
ISO 4042:2018(E)


Introduction
This document was completely revised to take into account new developments related to hexavalent
chromium free passivations, application of sealants and top coats, requirements for functional
properties as well as results of research work to minimize the risk of hydrogen embrittlement.
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I.S. EN ISO 4042:2018
 I.S. EN ISO 4042:2018

INTERNATIONAL STANDARD ISO 4042:2018(E)

Fasteners — Electroplated coating systems

1 Scope
This document specifies requirements for electroplated coatings and coating systems on steel
fasteners. The requirements related to dimensional properties also apply to fasteners made of copper
or copper alloys.
It also specifies requirements and gives recommendations to minimize the risk of hydrogen
embrittlement; see 4.4 and Annex B.
It mainly applies to zinc and zinc alloy coating systems (zinc, zinc-nickel, zinc-iron) and cadmium,
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primarily intended for corrosion protection and other functional properties:

— with or without conversion coating;
— with or without sealant;
— with or without top coat;
— with or without lubricant (integral lubricant and/or subsequently added lubricant).
Specifications for other electroplated coatings and coating systems (tin, tin-zinc, copper-tin, copper-
silver, copper, silver, copper-zinc, nickel, nickel-chromium, copper-nickel, copper-nickel-chromium)
are included in this document only for dimensional requirements related to fasteners with ISO metric
threads.
This document applies to bolts, screws, studs and nuts with ISO metric thread, to fasteners with non-
ISO metric thread, and to non-threaded fasteners such as washers, pins, clips and rivets.
Information for design and assembly of coated fasteners is given in Annex A.
This document does not specify requirements for properties such as weldability or paintability.
NOTE Other International Standards specify differing electroplating processes. For electroplating of
fasteners, the requirements of this document apply, unless otherwise agreed.

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  1456, Metallic and other inorganic coatings — Electrodeposited coatings of nickel, nickel plus
chromium, copper plus nickel and of copper plus nickel plus chromium
ISO 1463, Metallic and oxide coatings — Measurement of coating thickness — Microscopical method
ISO 1502, ISO general-purpose metric screw threads — Gauges and gauging
ISO 1891-2, Fasteners — Terminology — Part 2: Vocabulary and definitions for coatings
ISO  2081, Metallic and other inorganic coatings — Electroplated coatings of zinc with supplementary
treatments on iron or steel
ISO 2082, Metallic and other inorganic coatings — Electroplated coatings of cadmium with supplementary
treatments on iron or steel

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