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BS EN ISO 4042:2022

BS EN ISO 4042:2022

$215.11

Fasteners. Electroplated coating systems

Published By Publication Date Number of Pages
BSI 2022 72
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This document specifies requirements for steel fasteners with electroplated coatings and coating systems. 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 fasteners with zinc and zinc alloy coating systems (zinc, zinc-nickel, zinc-iron) and cadmium, primarily intended for corrosion protection and other functional properties: ā€”    with or without conversion coating, ā€”    with or without sealant, ā€”    with or without top coat, ā€”    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. The requirements of this document for electroplated fasteners take precedence over other documents  dealing with electroplating. This document applies to steel bolts, screws, studs and nuts with ISO metric thread, to other threaded fasteners and to non-threaded fasteners such as washers, pins, clips and rivets. NOTE       Electroplating is also applied to stainless steel fasteners, e.g. for the purpose of lubrication in order to avoid galling. 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.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 European foreword
Endorsement notice
10 Foreword
11 Introduction
12 1 Scope
2 Normative references
13 3 Terms and definitions
4 General characteristics of the coating
4.1 Coating metals or alloys and main purposes
14 4.2 Build-up of basic electroplated coating systems
15 4.3 Coating systems and coating processes
4.4 Internal hydrogen embrittlement
4.4.1 General
16 4.4.2 Fasteners with hardness up to 360 HV
4.4.3 Fasteners with hardness above 360 HV and up to 390 HV
4.4.4 Fasteners with hardness above 390 HV
17 4.4.5 Fasteners in accordance with ISO 898-1, ISO 898-2 and ISO 898-3
18 4.4.6 Case-hardened fasteners
19 4.4.7 Work hardened fasteners and fasteners with threads rolled after heat treatment
20 4.4.8 Fasteners with bainitic structure
4.5 Baking
5 Corrosion protection and testing
5.1 General
21 5.2 Neutral salt spray test (NSS) for zinc-based coating systems
22 5.3 Sulfur dioxide test (Kesternich test)
23 5.4 Bulk handling, automatic processes such as feeding and/or sorting, storage and transport
6 Dimensional requirements and testing
6.1 General
6.2 Fasteners with ISO metric thread
6.2.1 Coating thickness
24 6.2.2 Gaugeability and assemblability
6.3 Other fasteners
25 6.4 Test methods for thickness determination
27 7 Mechanical and physical properties and testing
7.1 General
7.2 Appearance
7.3 Corrosion resistance related to temperature
7.4 Torque/clamp force relationship
7.5 Determination of hexavalent chromium
28 8 Applicability of tests
8.1 General
8.2 Tests mandatory for each lot
8.3 Tests for in-process control
8.4 Tests to be performed when specified by the purchaser
9 Designation system
9.1 General
29 9.2 Designation of electroplated coating systems for the order
31 9.3 Examples of designation of hexavalent chromium free electroplated coating systems for fasteners
32 9.4 Designation of fasteners with electroplated coating systems for labelling
10 Ordering requirements for electroplating
33 11 Storage conditions
34 Annex A (informative) Design and assembly aspects for joints with coated fasteners
42 Annex B (informative) Hydrogen embrittlement consideration
47 Annex C (informative) Corrosion protection related to zinc coatings with chromate conversion coatings
48 Annex D (informative) Coating thickness and thread clearance for ISO metric threads
55 Annex E (informative) Coating systems tested in accordance with ISO 9227, NSS ā€” Evaluation of cabinet corrosivity for the neutral salt spray test
65 Annex F (informative) Obsolete designation codes for electroplated coating systems on fasteners according to ISO 4042:1999
68 Bibliography

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BS EN ISO 4042:2022
$215.11