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Countersunk head screw with hexagon socket
ISO 10642, steel 08.8, zinc-nickel silver (ZNSHR)
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Variants
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Connection elements with a galvanised chromium (VI)-free zinc-nickel coating 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).
Overview of advantages:
- Corrosion resistance of up to 720 hrs to base metal corrosion in accordance with DIN EN ISO 9227 NSS
- Adjusted friction coefficient range of 0.12 μ–0.18 μ due to top coat with integrated lubricating particles, thermal capacity up to 120°C
- Even coat distribution
- Functional and decorative
DIN 7991 has been withdrawn and replaced by ISO 10642. There is some limited similarity (some head heights and head diameters changed | nominal Ø M18, M22, M24 removed | Stainless steels removed | strength classes 10.9 and 12.9 added).
Due to their head geometry, these screws can only be subjected to limited loads, see DIN EN ISO 898-1
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