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Screw, flattened half round head, with collar and hexagon socket assortment
Screw, flattened half round head, with collar and hexagon socket assortment - 1
Screw, flattened half round head, with collar and hexagon socket assortment - 2

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Screw, flattened half round head, with collar and hexagon socket assortment

1000 pieces in system case 4.4.1. ISO 7380-2, steel 010.9, 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 hours against base metal corrosion in accordance with DIN EN ISO 9227 NSS

  • Chromium(VI)-free

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

  • Thermal capacity up to 120°C

  • Even coating distribution

  • Functional and decorative