EN ISO 4042:1999
(Main)Fasteners - Electroplated coatings (ISO 4042:1999)
Fasteners - Electroplated coatings (ISO 4042:1999)
Migrated from Progress Sheet (TC Comment) (2000-07-10): Wait for final ISO-text for PQ or PV. ISO 4042 is under revision.
Verbindungselemente - Galvanische Überzüge (ISO 4042:1999)
Diese Internationale Norm behandelt maßliche Anforderungen an Verbindungs- elemente aus Stahl oder Kupferlegierung mit galvanischen Überzügen. Sie legt Schichtdicken fest und gibt Empfehlungen zur Verminderung der Wasserstoffver- sprödungsgefahr bei Verbindungselementen mit hoher Festigkeit oder Härte oder oberflächengehärteten Verbindungselementen. Die Norm gilt in erster Linie fürdas Aufbringen galvanischer Überzüge auf Verbindungselementen mit Gewinde, siekann aber auch für andere Teile mit Gewinde angewendet werden.
Eléments de fixation - Revêtements électrolytiques (ISO 4042:1999)
La présente Norme internationale spécifie les caractéristiques dimensionnelles des éléments de fixation en acier ou en alliage de cuivre, avec revêtement électrolytique. Elle spécifie les épaisseurs de revêtement et donne des recommandations pour la non-fragilisation par l'hydrogène des éléments de fixation présentant une résistance à la traction ou une dureté élevée et pour les éléments de fixation ayant subi un durcissement superficiel.La présente Norme internationale traite principalement du revêtement électrolytique des éléments de fixation filetés, mais elle peut également s'appliquer à d'autres pièces filetées. Pour l'application aux vis qui forment leur propre filetage par déformation ou par enlèvement de matière.Les spécifications données dans la présente Norme internationale peuvent également être appliquées aux pièces non filetées comme des rondelles et des goupilles.
Mehanski vezni elementi - Galvanske prevleke veznih elementov (ISO 4042:1999)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2001
Mehanski vezni elementi - Galvanske prevleke veznih elementov (ISO 4042:1999)
Fasteners - Electroplated coatings (ISO 4042:1999)
Verbindungselemente - Galvanische Überzüge (ISO 4042:1999)
Eléments de fixation - Revetements électrolytiques (ISO 4042:1999)
Ta slovenski standard je istoveten z: EN ISO 4042:1999
ICS:
21.060.01 Vezni elementi na splošno Fasteners in general
25.220.40 Kovinske prevleke Metallic coatings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL ISO
STANDARD 4042
Second edition
1999-06-15
Fasteners — Electroplated coatings
Éléments de fixation — Revêtements électrolytiques
A
Reference number
ISO 4042:1999(E)
ISO 4042:1999(E)
Contents
Page
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Dimensional requirements and gauging .3
4.1 Dimensional requirements before electroplating.3
4.2 Dimensional requirements after electroplating .3
5 Other coating requirements.3
6 Hydrogen embrittlement relief.3
7 Corrosion protection .4
8 Applicability to fasteners that cut or form their own mating threads .4
9 Specification of coating thickness.4
10 Measurement of coating thickness.5
10.1 Local thickness.5
10.2 Batch average thickness.7
10.3 Agreement on test method .7
11 Sampling for thickness tests.7
12 Ordering requirements for electroplating .7
13 Designation .7
Annex A (informative) Hydrogen embrittlement relief.8
Annex B (informative) Salt spray corrosion protection performance of metallic coatings .10
Annex C (informative) Guidance on procedures that may be adopted to accommodate thick coatings.12
Annex D (normative) Determination of batch average thickness .13
Annex E (normative) Designation code, system A, for electroplated coatings on threaded parts.16
Annex F (informative) Examples for coating designation.19
Annex G (informative) Surface areas of bolts, screws and nuts .20
Bibliography.23
© ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
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ISO
ISO 4042:1999(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 4042 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC1,
Mechanical properties of fasteners.
This second edition cancels and replaces the first edition (ISO 4042:1989) which has been technically revised.
Annexes D and E form a normative part of this International Standard. Annexes A, B, C, F and G are for information
only.
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INTERNATIONAL STANDARD ISO ISO 4042:1999(E)
Fasteners — Electroplated coatings
1 Scope
This International Standard specifies dimensional requirements for electroplated fasteners of steel or copper alloy. It
specifies coating thicknesses and gives recommendations for hydrogen embrittlement relief for fasteners with high
tensile strength or hardness and for surface-hardened fasteners.
This International Standard primarily concerns the electroplating of threaded fasteners, but it may also be applied to
other threaded parts. For the applicability to screws that cut or form their own mating threads, see clause 8.
The specifications given in this International Standard may also be applied to non-threaded parts such as washers
and pins.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 965-1:1999, ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data.
ISO 965-2:1999, ISO general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for general
purpose bolt and nut threads — Medium quality.
ISO 965-3:1999, ISO general purpose metric screw threads — Tolerances — Part 3: Deviations for constructional
threads.
ISO 1456:1988, Metallic coatings — Electrodeposited coatings of nickel plus chromium and of copper plus nickel
plus chromium.
ISO 1458:1988, Metallic coating — Electrodeposited coatings of nickel.
ISO 1502:1996, ISO general purpose metric screw threads — Gauges and gauging.
ISO 2064:1996, Metallic and other non-organic coatings — Definitions and conventions concerning the
measurement of thickness.
ISO 2081:1986, Metallic coatings — Electroplated coatings of zinc on iron or steel.
ISO 2082:1986, Metallic coatings — Electroplated coatings of cadmium on iron or steel.
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ISO
ISO 4042:1999(E)
1)
ISO 3269:— , Fasteners — Acceptance inspection.
ISO 4520:1981, Chromate conversion coatings on electroplated zinc and cadmium coatings.
ISO 9227:1990, Corrosion tests in artificial atmospheres — Salt spray tests.
2)
ISO 9587:— , Metallic and other inorganic coatings — Pre-treatments of iron or steel for reducing the risk of
hydrogen embrittlement.
2)
ISO 15330:— , Fasteners — Preloading test for the detection of hydrogen embrittlement — Parallel bearing
surface method.
3 Terms and definitions
For the purposes of this International Standard, the definitions given in ISO 2064 (in particular, the definitions of
significant surface, measuring area, local thickness and minimum local thickness) and ISO 3269 together with the
following, apply.
3.1
batch
quantity of identical fasteners from the same manufacturing lot processed together at one time
3.2
production run
those batches of parts processed continuously without any changes in coating techniques or constituents
3.3
batch average thickness
calculated average thickness of a coating if it was uniformly distributed over the surface of the parts of the batch
3.4
baking
process of heating parts for a definite time at a given temperature in order to minimize the risk of hydrogen
embrittlement
3.5
baking duration
time at which the parts are held at the specified temperature which they shall have completely reached
1)
To be published. (Revision of ISO 3269:1988)
2)
To be published.
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ISO 4042:1999(E)
4 Dimensional requirements and gauging
4.1 Dimensional requirements before electroplating
Before coating, parts shall comply with the relevant International Standards if applicable or other standards as
specified, except where threads or other features are specifically manufactured to allow, for functional reasons, the
application of thicker coatings than are possible on normal threads.
Coating thicknesses which can be applied on ISO metric threads in accordance with ISO 965-1, ISO 965-2 and ISO
965-3 depend on the fundamental deviation available, which itself depends on the screw thread and the following
tolerance positions:
g, f, e for external threads;
G for internal threads or H if required.
The tolerance positions apply prior to application of the electroplated coating.
4.2 Dimensional requirements after electroplating
After coating, ISO metric screw threads shall be gauged in accordance with ISO 1502 with a GO gauge of tolerance
position h for external threads and H for internal threads.
Other product dimensions apply only before coating.
NOTE Care should be exercised where relatively thick coatings may affect dimensions with small tolerances as in the case
of internal drives; in these cases an agreement should be made between the supplier and the purchaser.
The applicability of the recommended coatings to ISO metric threads is limited by the fundamental deviation of the
threads concerned and hence, by the pitch and tolerance positions. The coating shall not cause the zero line (basic
size) to be exceeded in the case of external threads, nor shall it fall below this line in the case of internal threads.
This means that for an internal thread of tolerance position H, a measurable coating thickness can only be applied
to the threads if the tolerance zone is not taken up to the zero line (basic size).
5 Other coating requirements
The electroplated coating shall comply with the provisions of the relevant International Standards (ISO 1456,
ISO 1458, ISO 2081, ISO 2082) for the coating concerned in respect of appearance, adhesion, ductility, corrosion
resistance, etc.
6 Hydrogen embrittlement relief
In cases of parts
with high tensile strength or hardness or which have been surface hardened,
which have absorbed hydrogen and
are under tensile stress
there is the risk of failure due to hydrogen embrittlement.
When the core or surface hardness is above 320 HV, process investigation shall be conducted using a test to detect
hydrogen embrittlement, for example the "Parallel bearing surface method" in accordance with ISO 15330, to be
sure that the process with regard to embrittlement is under control. If embrittlement is discovered, modification of
the manufacturing process will be necessary, such as the inclusion of a baking process (see informative annex A for
more information).
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ISO 4042:1999(E)
For fasteners of hardness in excess of 365 HV, a written agreement should exist between the customer and
manufacturer to define how to manage the risk. If written agreement does not exist, the manufacturer shall process the
parts in accordance with his recommended practices to reduce the risk of hydrogen embrittlement.
Complete elimination of hydrogen embrittlement cannot be assured. If a reduced probability of encountering
hydrogen embrittlement is desired, alternative procedures should be evaluated.
NOTE Investigations are proceeding to develop methods for the reduction of h
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