Din 50961 Fe Zn 8b [top] Guide

: Specifies the minimum coating thickness in micrometers (µm). A thickness of 8 µm is roughly equivalent to 0.00031 inches.

Older "b" passivation contained Cr⁶⁺ (carcinogenic). Today, trivalent Cr blue passivation (RoHS-compliant) is the functional replacement, though exact color and performance may differ slightly. din 50961 fe zn 8b

The letter signifies the visual and functional finish applied after the zinc plating: : Specifies the minimum coating thickness in micrometers