Countersunk head screw with hexagon socket
ISO 10642 steel 08.8 zinc-nickel silver ZNSHR
SCR-ISO10642-08.8-HS2,5-(ZNSHR)-M4X20
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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DIN 7991 has been withdrawn and replaced by ISO 10642.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
Datasheets(X)
 | |
Thread type x nominal diameter (d1) | M4 |
Length (l1) | 20 mm |
Head diameter (dk) | 8.96 mm |
Head height (k1) | 2.48 mm |
Internal drive (s1) | HS2.5 |
Standards | ISO 10642 |
Material | Steel |
Property class | 08.8 |
Surface | Zinc nickel silver |
RoHS-compliant | Yes |
Head type | Countersunk head |
Drive type | Hexagon socket |
Thread type | Metric thread |
Thread form | Standard metric thread |
Product class | A |
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