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Raised countersunk head screw with recessed head, H ISO 7047, steel 4.8, zinc-nickel, black (ZNBHL)
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Connection elements with a galvanised chrome (VI)-free zinc-nickel coating (ZNBHL black or ZNSHL silver) are suitable for applications with a high risk of corrosion. The coating comprises a zinc-nickel alloy layer and a seal (top coat with integrated lubricating particles).
Overview of advantages:
- Corrosion resistance of up to 720 hrs to base metal corrosion in accordance with DIN EN ISO 9227 NSS
- Adjusted friction coefficient range from 0.09μ – 0.14μ due to top coat with integrated lubricating particles
- Thermal capacity up to 120 °C
- Even coat distribution
- Functional and decorative
ISO 7047 replaces DIN 966 | There is some limited similarity | Some head heights and head diameters have been changed | Thread lengths changed | Strength class 5.8 and 8.8 omitted | Recessed head penetration depths changed.
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