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Flat-head screw with H cross recess
Flat-head screw with H cross recess - 1
Flat-head screw with H cross recess - 2

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Flat-head screw with H cross recess

ISO 7045, steel 4.8, zinc-nickel, black (ZNBHL)

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Fasteners with a zinc-plated chromium (VI)-free zinc-nickel black coating (ZNBHL) are suitable for applications with a high risk of corrosion. The coating comprises a zinc-nickel alloy layer and a sealing coat (top coat with integrated lubricating particles).



Corrosion resistance:



  • Diameter ≥ M2 – 360h*

  • Diameter ≥ M4 – 480h*

  • Diameter ≥ M10 – 720h*


  • *No base metal corrosion at points without thread in salt spray mist testing according to DIN EN ISO 9227 NSS


Overview of advantages:



  • Corrosion resistance of up to 720 hrs to base metal corrosion in accordance with DIN EN ISO 9227 NSS

  • Chromium(VI)-free

  • Adjusted friction coefficient range of 0.09 μ–0.14 μ due to top coat with integrated lubricating particles

  • Thermal capacity up to 120°C

  • Even coat distribution

  • Functional and decorative
Notice

ISO 7045 replaces DIN 7985 | There is some similarity | some head heights and head diameters changed | thread lengths changed | penetration depths of recessed heads changed | standard title of raised countersunk head screw changed to flat head screw.