Countersunk screw with hexagon socket head
DIN 7991 steel 08.8 zinc flake silver
SCR-ISO10642-08.8-HS12-(ZFSHL)-M20X55
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Zinc-flake coatings are chromium(VI)-free corrosion protection coatings for commercial vehicle construction, construction machines, agricultural vehicles and equipment, and all other fields that have vehicle construction standard corrosion protection requirements.
Corrosion resistance for ZFSHL is:
- Diameter ≥ M6 - 480h*
- Diameter ≥ M10 - 720h*
The designation ZFSHL refers to the following corrosion coating:
- Zinc-flake coating, with top coat, silver colour, with lubrication that alters the friction coefficient.
- Adjusted friction coefficient range from 0.09 μ-0.14 μ due to top coat with integrated lubricating particles
DIN 7991 has been withdrawn and replaced by ISO 10642. There is some limited similarity (Some head heights and head diameters changed | Nominal diameter M18, M22, M24 removed | Stainless steels removed | Strength classes 10.9 and 12.9 added).
Countersinking angle:
M3 - M20: 90°
M22 and M24: 60°
Due to their head geometry, these screws can only be subjected to limited loads, see DIN EN ISO 898-1
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