). In this case, the zinc layer must be at least 8 microns thick at any measurable point on the significant surface.
When sourcing, ensure that the supplier provides RoHS-compliant trivalent passivation to meet current environmental regulations, and always consider the 8 μ m thickness when designing threaded fasteners.
is a retired German standard (superseded by DIN EN ISO 2081) that specified requirements for electroplated zinc coatings on iron and steel parts. Although replaced, the nomenclature remains widely used in legacy drawings, automotive, and industrial fasteners across Europe. din 50961 fe zn 8b
Why choose over 12 or 25?
Internal, non-exposed steel components.
decodes as:
Always verify with your coating supplier if Cr(VI)-free alternatives are acceptable for your application. is a retired German standard (superseded by DIN
This thickness is ideal for mild commercial environments, offering a balanced compromise between corrosion resistance and thread tolerance for fasteners. 5. B (The Chromate Conversion/Passivation)
: The German national standard that specifies terms, testing, and corrosion resistance for electroplated zinc coatings on iron or steel. It is typically used in conjunction with DIN EN ISO 2081. Fe : Indicates the substrate material is Iron or Steel . Internal, non-exposed steel components
