Countersunk screw with hexagon socket head

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 μ-0.14 μ due to top coat with integrated lubricating particles


• Thermal capacity up to 120°C


• Even coating distribution


• Functional and decorative