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BSI
BS 7371-8:2011

BS 7371-8:2011

Current

Current

The latest, up-to-date edition.

Coatings on metal fasteners Specification for sherardized coatings

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-03-2011

Publisher

British Standards Institution

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Process
5 Classification
6 Properties
7 Thread clearance
8 Information to be documented and supplied to
  the coater
9 Identification
Annexes
Annex A (informative) - Selection of coating
Annex B (normative) - Measurement of coating
        thickness
Bibliography

Describes requirements for sherardized coatings on iron and steel fasteners and accessories applied by thermal diffusion of zinc powder onto a component's surface.

This part of BS7371 specifies requirements for sherardized coatings on iron and steel fasteners and accessories applied by thermal diffusion of zinc powder onto a component’s surface. NOTE Hydrogen embrittlement is not induced as a result of this coating process. The coating consists of zinc/iron alloys, which are subsequently treated using either a zinc phosphate treatment (see BS7371-9:1996, Type2) or a suitable substitute treatment similar to those used in electroplating zinc (see BS7371-3:2009) and mechanical plating (see BS7371-7:2010). This results in a dust free surface, which, when required, can be lubricated to give controlled torque/clamping force properties (see BS7371-2:1993). In addition to the requirements in this part of BS7371, the requirements in BS7371-1:2009 that are applicable to sherardized coatings apply. This part of BS7371 also specifies requirements for: the local coating thickness for six grades of coating; possible types of post treatment; the assessment of corrosion resistance of unused coated parts when subjected to neutral salt spray testing (see BSENISO9227:2006).

Committee
FME/9/-/1
DevelopmentNote
Supersedes BS 7371-8(1998) & 10/30228091 DC. (03/2011)
DocumentType
Standard
Pages
20
PublisherName
British Standards Institution
Status
Current
Supersedes

BS 7371-9:1996 Coatings on metal fasteners Specification for phosphate or phosphate and oil coatings
BS 1210:1963 Specification for wood screws
BS 7371-10:1994 Coatings on metal fasteners Specification for organic coatings
BS 7371-11:1993 Coatings on metal fasteners Specification for zinc flake non-electrolytically applied cured coatings
BS EN ISO 3497:2001 Metallic coatings. Measurement of coating thickness. X-ray spectrometric methods
BS 7371-6(1998) : 1998 COATINGS ON METAL FASTENERS - PART 6: SPECIFICATION FOR HOT DIPPED GALVANIZED COATINGS
BS EN 15048-2:2007 Non-preloaded structural bolting assemblies Suitability test
BS EN ISO 10683:2014 Fasteners. Non-electrolytically applied zinc flake coatings
BS 7371-2:1993 Coatings on metal fasteners Specification for torque/clamping force relationship
BS EN 15048-1:2007 Non-preloaded structural bolting assemblies General requirements
BS 7371-4:1994 Coatings on metal fasteners Specification for electroplated nickel, nickel/chromium and copper/nickel/chromium coatings
BS EN ISO 1463:2004 Metallic and oxide coatings. Measurement of coating thickness. Microscopical method
BS EN ISO 9227:2017 Corrosion tests in artificial atmospheres. Salt spray tests
BS 7371-12:2008 Coatings on metal fasteners Requirements for imperial fasteners
BS EN ISO 3882:2003 Metallic and other inorganic coatings. Review of methods of measurement of thickness

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Hardcopy - English
PDF - English
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