Zn 8b: Din 50961 Fe

The designation DIN 50961 - Fe Zn 8b refers to a specific standard for electroplated zinc coatings on iron and steel components, widely used in the automotive and engineering industries.

• FE: denotes steel substrate (Fe = iron/steel).
• Zn: zinc-based coating.
• 8: corrosion resistance class (typically corresponding to hours in neutral salt spray test — e.g., class 8 indicates higher resistance than lower numbers).
• B: friction/torque class or topcoat/passivation designation (B commonly refers to a specified torque coefficient range and/or a particular chem passivation/topcoat).

: Represents the minimum required local thickness of the zinc coating, which is (micrometers). din 50961 fe zn 8b

: The steel part (Fe) starts its journey by being cleaned of all grease and oxides. Without a perfectly clean surface, the protective layers won't stick. The Zinc Shield : The part is submerged in an electrolytic bath The designation DIN 50961 - Fe Zn 8b

• Cause: No post-plate baking on hardened steel (e.g., Grade 10.9 bolts).
• Solution: Specify "Fe Zn 8b + baking" on the drawing. Ensure the plater provides a temperature chart.

DIN 50961 Fe/Zn 8 B specifies a minimum 8-micrometer thick, blue chromate-passivated electroplated zinc coating on iron or steel for moderate corrosion protection. This German standard is often used for fasteners, though it is frequently superseded by DIN EN ISO 2081 or RoHS-compliant alternatives. For a detailed breakdown of this specification, visit Scribd.  DIN 50961 Electroplated ZN Coating | PDF - Scribd FE: denotes steel substrate (Fe = iron/steel)

If you’ve recently looked at a technical drawing, a fastener specification, or an automotive parts list, you may have encountered this alphanumeric code. To the uninitiated, it looks like a complex cipher. However, once disassembled, it provides a complete recipe for electroplating steel components.