EVS-EN ISO 17668:2016

This ISO standard specifies minimum thickness requirements for six classes of zinc coating applied to ferrous products by the sherardizing process for the purpose of protection against corrosion and wear. It also specifies the minimum requirements of the zinc dust to be used in the sherardizing process. This standard does not specifiy any requirements for the surface condition (finish or roughness) of the basis material before sherardizing.
After-treatments or organic over-coatings of sherardized articles are not in the scope of this standard. This standard does not apply to sherardized products (e.g. fasteners, tubes) for which specific standards exist and which may include additional requirements or requirements which are different from those of this standard.
NOTE Individual product standards can incorporate this standard for the coating by quoting its number, or may incorporate it with modification specific to the product.