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Countersunk screw with hexalobular head ISO 14581, steel, strength class 8.8, zinc-nickel-plated, black (ZNBHL)
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Countersunk screw with hexalobular head ISO 14581, steel, strength class 8.8, zinc-nickel-plated, 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 0.09μ - 0.14μ due to top coat with integrated lubricating particles
- Thermal capacity up to 120°C
- Even coating distribution
- Functional and decorative
Notice
- Head dimensions in ISO 14581 countersunk screws are gauged in accordance with ISO 7721
- Some screws with short dimensions are threaded up to the head, see also ISO 14581
- Countersinks for screw heads in accordance with ISO 14581 must comply with ISO 15065
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