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  • BSI
    BS 7371-7:2010 Coatings on metal fasteners - Specification for mechanically applied zinc and zinc based coatings
    Edition: 2010
    $321.59
    / user per year

Description of BS 7371-7:2010 2010

This part of BS 7371 specifies requirements for coatings applied by mechanically impacting zinc powder, or zinc based powder on to the component surface in an aqueous medium. The coating is not applied by using impact media accelerated by compressed air or centrifuge methods. The coatings consist principally of zinc and can be lubricated to give controlled torque/clamping force properties when required.

NOTE 1 See, for example, BS 7371-2.

In addition to the requirements in this part of BS 7371, the requirements in BS 7371-1 which are applicable to mechanically applied zinc based coatings apply.

This part of BS 7371 also specifies requirements for:

  1. the coating thickness;

  2. the type of conversion treatment to be applied, which can be hexavalent, tri-valent or chromium free;

  3. the quality assessment of the corrosion resistance of unused coated parts when subjected to neutral salt spray testing;

    NOTE 2 See, for example, BS EN ISO 9227.

  4. the adhesion test.

The coatings are suitable for application to metal components such as:

  1. parallel threaded fasteners and accessories;

  2. screws that cut or form their own threads, e.g. self-tapping screws;

    NOTE 3 See, for example, BS 4174.

  3. woodscrews;

    NOTE 4 See, for example, BS 1210.

  4. springs and spring components;

  5. pipe nuts and connectors with parallel or tapered threads;

  6. composite fasteners incorporating non-conducting materials (e.g. rubber-bonded assembly).

When these coatings are applied to non-ferrous fasteners, the only part of the specification that applies is the coating thickness requirements.

Annexes include tables indicating suitable coating grades for standard screw threads and methods of determination of coating thickness.



Standard NumberBS 7371-7:2010
TitleCoatings on metal fasteners - Specification for mechanically applied zinc and zinc based coatings
StatusConfirmed
Publication Date2010-04-30
ReplacesBS 7371-7:1994
DescriptorsPassivation, Threaded fasteners, Coating processes, Chromates, Metal coatings, Corrosion resistance, Thickness, Protective coatings, Zinc, Designations, Conversion coating, Metals, Fasteners, Appearance, Identification methods, Coatings, Zinc alloys
ICS25.220.40 Metallic coatings, 21.060.10 Bolts, screws, studs
CommitteeFME/9
ISBN978 0 580 67166 1
PublisherBSI
Pages22



About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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