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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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Fasteners with a galvanised chromium(VI)-free, zinc-nickel plated (ZNBHL black or ZNSHL silver) are suitable for applications with the highest risk of corrosion. The coating comprises a zinc nickel alloy layer and a sealing coat (top coat with integrated lubricating particles).
The advantages at a glance:
- Resistance of up to 720 hours against base metal corrosion in accordance with DIN EN ISO 9227 NSS
- Adjusted friction coefficient range from 0.09-0.14 μ due to top coat with integrated lubricating particles
- Thermal load capacity up to 120 °C
- Even coating distribution
- Functional and decorative
ISO 7047 replaces DIN 966 | Standards are not fully equivalent | Some head heights and head diameters have been changed | Thread lengths changed | Strength class 5.8 and 8.8 omitted | Cross recess penetration depths changed.
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