Fasteners - Non-electrolytically applied zinc flake coating systems (ISO 10683:2018)

This document specifies requirements for non-electrolytically applied zinc flake coating systems for steel fasteners. It is applicable to coatings:
—          with or without hexavalent chromium;
—          with or without top coat;
—          with or without lubricant (integral lubricant and/or subsequently added lubricant).
It is applicable 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, etc.
This document does not specify requirements for such fastener properties as weldability or paintability. It is not applicable to mechanically applied zinc coatings.
NOTE       Coatings in accordance with this document are especially used for high strength fasteners (≥ 1 000 MPa) to avoid risk of internal hydrogen embrittlement (IHE — see 4.4).
Information for design and assembly of coated fasteners is given in Annex A.

Verbindungselemente - Nichtelektrolytisch aufgebrachte Zinklamellenüberzugsysteme (ISO 10683:2018)

Fixations - Systèmes de revêtements non électrolytiques de zinc lamellaire (ISO 10683:2018)

Le présent document spécifie les exigences relatives aux systèmes de revêtements non électrolytiques de zinc lamellaire pour les fixations en acier. Il s'applique aux revêtements:
—          avec ou sans chrome hexavalent;
—          avec ou sans finition «top coat»;
—          avec ou sans lubrifiant (lubrifiant intégré et/ou lubrifiant additionnel).
Il s'applique aux vis, goujons, tiges filetées et écrous à filetage métrique ISO, aux fixations à filetage non métrique ISO et aux fixations non filetées telles que les rondelles, les goupilles, les clips, etc.
Le présent document ne spécifie aucune exigence pour les caractéristiques des fixations telles que la soudabilité ou l'aptitude à la peinture. Il ne s'applique pas aux revêtements de zinc appliqués mécaniquement (matoplastie).
NOTE       Les revêtements conformes au présent document sont particulièrement utilisés pour les fixations à haute résistance mécanique (≥ 1 000 MPa) afin d'éviter le risque de fragilisation par l'hydrogène interne (IHE, Internal Hydrogne Embrittlement — voir 4.4).
Des informations pour la conception et l'assemblage des fixations revêtues sont données en Annexe A.

Vezni elementi - Cinkova lamelna prevleka, ki ni izdelana z elektrolizo (ISO 10683:2018)

Ta dokument določa zahteve za sisteme cinkovih lamelnih prevlek, ki niso izdelane z elektrolizo, za jeklene vezne elemente. Uporablja se za prevleke:
– s šestvalentnim kromom ali brez njega;
– z vrhnjim premazom ali brez njega;
– z mazivom (integriranim ali naknadno dodanim) ali brez njega.
Uporablja za vijake in matice z ISO-metričnim navojem, vezne elemente z metričnimi navoji, ki niso del ISO, ter vezne elemente brez navojev, kot so podložke, zatiči, objemke itd.
Ta dokument ne določa zahtev za lastnosti veznih elementov, kot je varivost ali možnost barvanja. Ne uporablja se za mehansko nanesene cinkove prevleke.
OPOMBA: Prevleke v skladu s tem dokumentom se uporabljajo zlasti za zelo trdne vezne elemente (≥ 1000 MPa) pri preprečevanju tveganja za notranjo krhkost ob stiku z vodikom (IHE – glej 4.4).
Informacije o projektiranju in sestavljanju prevlečenih veznih elementov so podane v dodatku A.

General Information

Status
Published
Publication Date
18-Sep-2018
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
19-Sep-2018
Completion Date
19-Sep-2018

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SLOVENSKI STANDARD
SIST EN ISO 10683:2018
01-december-2018
1DGRPHãþD
SIST EN ISO 10683:2014
Vezni elementi - Cinkova lamelna prevleka, ki ni izdelana z elektrolizo (ISO
10683:2018)

Fasteners - Non-electrolytically applied zinc flake coating systems (ISO 10683:2018)

Verbindungselemente - Nichtelektrolytisch aufgebrachte Zinklamellenüberzugsysteme

(ISO 10683:2018)
Fixations - Systèmes de revêtements non électrolytiques de zinc lamellaire (ISO
10683:2018)
Ta slovenski standard je istoveten z: EN ISO 10683:2018
ICS:
21.060.01 Vezni elementi na splošno Fasteners in general
25.220.40 Kovinske prevleke Metallic coatings
SIST EN ISO 10683:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 10683:2018
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SIST EN ISO 10683:2018
EN ISO 10683
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2018
EUROPÄISCHE NORM
ICS 21.060.01; 25.220.40 Supersedes EN ISO 10683:2014
English Version
Fasteners - Non-electrolytically applied zinc flake coatings
(ISO 10683:2018)

Fixations - Systèmes de revêtements non Verbindungselemente - Nichtelektrolytisch

électrolytiques de zinc lamellaire (ISO 10683:2018) aufgebrachte Zinklamellenüberzüge (ISO 10683:2018)

This European Standard was approved by CEN on 10 August 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 10683:2018 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 10683:2018
EN ISO 10683:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 10683:2018
EN ISO 10683:2018 (E)
European foreword

This document (EN ISO 10683:2018) 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 10683:2014.

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 10683:2018 has been approved by CEN as EN ISO 10683:2018 without any modification.

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SIST EN ISO 10683:2018
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SIST EN ISO 10683:2018
INTERNATIONAL ISO
STANDARD 10683
Third edition
2018-08
Fasteners — Non-electrolytically
applied zinc flake coating systems
Fixations — Systèmes de revêtements non électrolytiques de zinc
lamellaire
Reference number
ISO 10683:2018(E)
ISO 2018
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SIST EN ISO 10683:2018
ISO 10683:2018(E)
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

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 10683:2018
ISO 10683:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General characteristics of the coating ............................................................................................................................................ 2

4.1 Zinc flake coating systems ............................................................................................................................................................. 2

4.2 Composition of the systems ......................................................................................................................................................... 2

4.3 Mechanical and physical properties and curing......................................................................................................... 2

4.4 Avoidance of internal hydrogen embrittlement ......................................................................................................... 3

4.5 Coating systems and coating processes............................................................................................................................. 3

5 Corrosion protection and testing ........................................................................................................................................................ 3

5.1 General ........................................................................................................................................................................................................... 3

5.2 Neutral salt spray test ....................................................................................................................................................................... 3

5.3 Sulfur dioxide test (Kesternich test) .................................................................................................................................... 4

5.4 Bulk handling, automatic processes such as feeding and/or sorting, storage and

transport .................. ..................................................................................................................................................................................... 4

6 Dimensional requirements and testing ........................................................................................................................................ 4

6.1 General ........................................................................................................................................................................................................... 4

6.2 Fasteners with ISO metric thread ........................................................................................................................................... 4

6.2.1 Coating thickness ............................................................................................................................................................ 4

6.2.2 Gaugeability and assemblability ........................................................................................................................ 5

6.3 Other fasteners ....................................................................................................................................................................................... 6

7 Mechanical and physical properties and testing ................................................................................................................. 6

7.1 Appearance ................................................................................................................................................................................................ 6

7.2 Corrosion resistance related to temperature ............................................................................................................... 6

7.3 Test methods for thickness or coating weight determination ....................................................................... 6

7.4 Ductility ......................................................................................................................................................................................................... 7

7.5 Adhesion/cohesion ............................................................................................................................................................................. 8

7.6 Sacrificial cathodic protection ................................................................................................................................................... 8

7.7 Torque/clamp force relationship ............................................................................................................................................ 8

7.8 Determination of hexavalent chromium ........................................................................................................................... 8

8 Applicability of tests ......................................................................................................................................................................................... 8

8.1 General ........................................................................................................................................................................................................... 8

8.2 Tests mandatory for each lot ...................................................................................................................................................... 8

8.3 Tests for in-process control.......................................................................................................................................................... 9

8.4 Tests to be performed when specified by the purchaser .................................................................................... 9

9 Designation ................................................................................................................................................................................................................ 9

9.1 Designation of zinc flake coating systems for the order ..................................................................................... 9

9.2 Designation of zinc flake coating systems for labelling ....................................................................................10

10 Ordering requirements ..............................................................................................................................................................................10

Annex A (informative) Design aspects and assembly of coated fasteners ..................................................................12

Annex B (informative) Coating thickness and thread clearance for ISO metric screw threads ...........16

Annex C (informative) Coating systems tested in accordance with ISO 9227, NSS —

Evaluation of cabinet corrosivity for the neutral salt spray test .....................................................................23

Bibliography .............................................................................................................................................................................................................................31

© ISO 2018 – All rights reserved iii
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SIST EN ISO 10683:2018
ISO 10683:2018(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).

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, SC 14, Surface coatings.

This third edition cancels and replaces the second edition (ISO 10683:2014), which has been technically

revised. The main changes compared to the previous edition are as follows:
— the normative references have been updated;

— the restriction of gauging to external threads in the 2 paragraph of 6.2.2 has been removed;

— the last column in Table B.2 with maximum clearance for tolerance position e has been removed;

— Annex C has been revised completely.
iv © ISO 2018 – All rights reserved
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SIST EN ISO 10683:2018
INTERNATIONAL STANDARD ISO 10683:2018(E)
Fasteners — Non-electrolytically applied zinc flake
coating systems
1 Scope

This document specifies requirements for non-electrolytically applied zinc flake coating systems for

steel fasteners. It is applicable to coatings:
— with or without hexavalent chromium;
— with or without top coat;

— with or without lubricant (integral lubricant and/or subsequently added lubricant).

It is applicable 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, etc.

This document does not specify requirements for such fastener properties as weldability or paintability.

It is not applicable to mechanically applied zinc coatings.

NOTE Coatings in accordance with this document are especially used for high strength fasteners

(≥ 1 000 MPa) to avoid risk of internal hydrogen embrittlement (IHE — see 4.4).
Information for design and assembly of coated fasteners is given in Annex A.
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 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 3613:2010, Metallic and other inorganic coatings — Chromate conversion coatings on zinc, cadmium,

aluminium-zinc alloys and zinc-aluminium alloys — Test methods

ISO 6988, Metallic and other non organic coatings — Sulfur dioxide test with general condensation of

moisture
ISO 8991, Designation system for fasteners
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
ISO 16047, Fasteners — Torque/clamp force testing
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1891-2 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
© ISO 2018 – All rights reserved 1
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SIST EN ISO 10683:2018
ISO 10683:2018(E)
— IEC Electropedia: available at www .electropedia .org
4 General characteristics of the coating
4.1 Zinc flake coating systems

Zinc flake coating systems are produced by applying a zinc flake dispersion to the surface of a steel

fastener, usually with the addition of aluminium flakes, in a suitable medium. Under the influence

of heat (curing), a bonding amongst flakes and also between flakes and substrate is generated, thus

forming an inorganic surface coating sufficiently electrically conducting to ensure cathodic protection.

The coating system can contain hexavalent chromium, Cr(VI).

Special techniques can be necessary to avoid excessive or insufficient coating thickness.

Special techniques can be necessary to prevent lightweight and/or flat fasteners from sticking together

(e.g. washers, clips, fasteners with captive washer, flanged nuts).

An additional top coat can be applied to increase corrosion resistance and/or to achieve specific

properties (e.g. torque/clamp force properties, chemical resistance, aspect, colour, electrical insulation/

conductivity — see A.2).
4.2 Composition of the systems
There are four basic zinc flake coating systems, as shown in Figure 1.
Key
1 only base coat
2 base coat + lubricant
3 base coat + top coat
4 base coat + top coat + lubricant
Figure 1 — Basic zinc flake coating systems

Base coat and top coat can be with integral lubricant; see detailed possible combinations in A.1.2.

4.3 Mechanical and physical properties and curing

The coating process shall not adversely influence the mechanical and physical properties of the

fasteners.

NOTE Distributors who coat non-coated fasteners are considered as alteration distributors in accordance

with ISO 1891-4.

Depending on the zinc flake coating system, the curing temperatures can be up to 320 °C. The curing

temperature shall not be above the tempering temperature of quenched and tempered fasteners.

WARNING — The curing process (especially with higher temperature and/or longer duration)

can affect the fatigue limit of fasteners with thread rolled after heat treatment. See also A.1.3 for

other possible effects of curing.
2 © ISO 2018 – All rights reserved
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SIST EN ISO 10683:2018
ISO 10683:2018(E)
4.4 Avoidance of internal hydrogen embrittlement

A characteristic of zinc flake coating systems is that hydrogen is not generated during the deposition

process.

Pre-treatment processes using alkaline/solvent cleaner followed by mechanical cleaning do not

generate hydrogen, thus eliminating all risk of internal hydrogen embrittlement (IHE).

When mechanical cleaning is not suitable for functional reasons (e.g. for fasteners with captive

washers, fasteners with internal threads, fasteners to be rack coated), chemical cleaning (pickling) may

be applied, provided that acid with suitable inhibitor and minimum cleaning cycle time are used to

minimize the risk of internal hydrogen embrittlement. Fasteners with hardness greater than 390 HV

or property class 12.9 and above shall not be subjected to acid cleaning. The duration between cleaning

and coating shall be as short as possible.

A phosphating process is permitted as an alternative to mechanical cleaning (hydrogen may be

generated during this pre-treatment process, however the curing process allows outward diffusion).

The duration between phosphating and coating shall be as short as possible.
Cathodic cleaning processes are not permitted.

NOTE Zinc flake coatings have a high permeability for hydrogen which, during the curing process, allows

outward diffusion of hydrogen that could have been absorbed during the pre-treatment process.

4.5 Coating systems and coating processes

The type and geometry of the fasteners shall be considered when selecting a coating system and the

related coating process; see A.2.
5 Corrosion protection and testing
5.1 General

Corrosion resistance in accelerated corrosion tests cannot be directly related to corrosion protection

behaviour in particular service environments. However, accelerated tests are used to evaluate the

corrosion resistance of the coating.
5.2 Neutral salt spray test

The neutral salt spray test (NSS) in accordance with ISO 9227 shall be used to evaluate the corrosion

resistance of the coating systems.

When evaluation of the cabinet corrosivity is requested, it should be performed in accordance with

Annex C.

The neutral salt spray test shall be carried out on fasteners alone, no sooner than 24 h after coating in

the “as-coated” condition, i.e. before sorting, packaging and/or assembling.

After the neutral salt spray test using a test duration of Table 1, there shall be no visible basis metal

corrosion (red rust).

The contact points of fasteners with a holding fixture shall not be considered in the evaluation of

corrosion protection.

NOTE Guidance for the selection of coating thickness in relation to corrosion protection is given in Annex B.

© ISO 2018 – All rights reserved 3
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SIST EN ISO 10683:2018
ISO 10683:2018(E)
Table 1 — Standard categories for neutral salt spray test
Neutral salt spray test duration Reference thickness
(without red rust) of the coating system
h µm
240 4
480 5
600 6
720 8
960 10

The reference thickness includes base coat(s) and top coat(s), if any, with or without Cr(VI). The corrosion resistance

shall be decisive for acceptance; the reference thickness is given for guidance only.

The composition of the system (base coat only, base coat + top coat, etc.) shall be specified at the time of the order.

5.3 Sulfur dioxide test (Kesternich test)
This test is only intended for outdoor building fasteners.

The sulfur dioxide test with general condensation of moisture in accordance with ISO 6988 shall be

used to evaluate the corrosion resistance of the coating systems; for outdoor building fasteners, the

test shall be carried out with two litres of SO .

The sulfur dioxide test shall be carried out on fasteners alone, no sooner than 24 h after coating in the

“as-coated” condition, i.e. before sorting, packaging and/or assembling.

The minimum number of cycles shall be agreed between the supplier and the purchaser at the time of

the order, i.e. 2 cycles, 3, 5, 8, 10, 12, 15 cycles, etc.

The contact points of fasteners with a holding fixture shall not be considered in the evaluation of

corrosion protection.

5.4 Bulk handling, automatic processes such as feeding and/or sorting, storage and

transport

Bulk handling, automatic processes such as feeding and/or sorting, storage and transport can cause a

significant reduction of corrosion protection depending on the coating system and type and geometry

of the fasteners. This can especially occur for Cr(VI)-free coating systems where less self-healing effect

takes place and/or where top coats are sensitive to impact damage and/or abrasion.

When necessary, an agreement should be reached between the supplier and the purchaser, e.g. by

reducing the minimum duration of neutral salt spray test and/or by increasing the thickness of the

coating system.
6 Dimensional requirements and testing
6.1 General

Before coating, fasteners shall be within the specified dimensions. For ISO metric threads, special

requirements may apply; see 6.2.2, B.4 and B.5.
6.2 Fasteners with ISO metric thread
6.2.1 Coating thickness

When considering the coating thickness related to the desired corrosion resistance, the dispersion of

the thickness of the coating system shall be taken into account; see B.3.
4 © ISO 2018 – All rights reserved
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SIST EN ISO 10683:2018
ISO 10683:2018(E)

Coating thickness has a significant influence on gaugeability and assemblability, therefore thread

tolerance and clearance in the thread shall be taken into account. The coating shall not cause the zero

line (basic size) to be exceeded in the case of external threads, nor shall it fall below in the case of

internal threads; see B.4.

NOTE For standard bolts, screws, studs and nuts not specifically manufactured to accommodate zinc flake

coatings, see B.4 and B.5.
6.2.2 Gaugeability and assemblability

Coated ISO metric screw threads shall be gauged with a GO-gauge, in accordance with ISO 1502, of

tolerance position h for external threads and H for internal threads.

When gauging coated threads of bolts, screws and studs, a maximum torque of 0,001 d (Nm) on a

length of 1d, beginning from thread end, is acceptable. When gauging coated internal threads of nuts, a

maximum torque of 0,001 D (Nm) is acceptable. See Table 2.
Table 2 — Maximum torque for gauging of coated ISO metric threads
Nominal thread diameter Maximum torque for gauging
d or D
mm Nm
3 0,03
4 0,06
5 0,13
6 0,22
8 0,51
10 1,0
12 1,7
14 2,7
16 4,1
18 5,8
20 8,0
22 11
24 14
27 20
30 27
33 36
36 47
39 59
a 3

For other diameters, the torque shall be calculated in accordance with 0,001 d or

0,001 D (Nm) and rounded to 2 significant figures.

Acceptance procedures for assemblability may be applied by agreement between supplier and

purchaser:
— for external thread, use of a suitable nut or the original mating fastener;

— for internal thread, use of a suitable mandrel (e.g. the mandrel specified for proof load in accordance

with ISO 898-2) or the original mating fastener.
© ISO 2018 – All rights reserved 5
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SIST EN ISO 10683:2018
ISO 10683:2018(E)
6.3 Other fasteners

After coating, there is no dimensional requirement for fasteners with non-ISO metric thread and for

non-threaded fasteners specified in this document. For additional information, see A.3.

7 Mechanical and physical properties and testing
7.1 Appearance

The colour of a zinc flake coating is originally silver-grey. Other colours can be obtained by using a top

coat. Variation in colour shall not be cause of rejection unless otherwise agreed; see Clause 10 g) and h).

The coated fastener shall be free from blisters and uncoated areas which can adversely affect the

corrosion protection. Local excess of coating shall not impair functional properties (see Clause 6 and A.2).

7.2 Corrosion resistance related to temperature

Elevated temperature can affect the corrosion protection of the coated fasteners. This test is specified

for in-process control; it is not intended to check the behaviour of the coated fasteners together with

the assembled parts.

After heating the coated fasteners for 3 h at 150 °C (part temperature) the corrosion resistance

requirements as specified in Clause 5 shall still be met.
Other specifications may be a
...

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