BS 7371-8:2011
$102.76
Coatings on metal fasteners – Specification for sherardized coatings
| Published By | Publication Date | Number of Pages |
| BSI | 2011 | 20 |
This part of BS 7371 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 BS 7371-9:1996, Type 2) or a suitable substitute treatment similar to those used in electroplating zinc (see BS 7371-3:2009) and mechanical plating (see BS 7371-7:2010). This results in a dust free surface, which, when required, can be lubricated to give controlled torque/clamping force properties (see BS 7371-2:1993).
In addition to the requirements in this part of BS 7371, the requirements in BS 7371-1:2009 that are applicable to sherardized coatings apply.
This part of BS 7371 also specifies requirements for:
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the local coating thickness for six grades of coating;
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possible types of post treatment;
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the assessment of corrosion resistance of unused coated parts when subjected to neutral salt spray testing (see BS EN ISO 9227:2006).
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 11 | Table 1 Classification of coating and local coating thickness |
| 13 | Table 2 Additional thread clearance for mating sherardized ISO metric coarse threads (both mating surfaces coated) |
| 16 | Figure B.1 Measuring area for coating thickness measurement of fasteners |
| 17 | Table B.1 Batch coating mass per unit area and average coating thickness |
