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Hexagon nut ISO 4032, 10 steel with silver zinc-flake coating (ZFSHR)
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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.
The corrosion resistance of ZFSHR is as follows:
- Diameter ≥ M6 - 480 h*
- Diameter ≥ M10 - 720 h*
- * Guideline values: No base metal corrosion in areas without thread in salt spray tests according to DIN EN ISO 9227 NSS.
The designation ZFSHR 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 0.12-0.18 μ due to top coat with integrated lubricating particles
ISO 4032 replaces DIN 934 | Standards are not equivalent| Nominal diameter changed | Some nut heights changed | Width across flats changed for M10, M12, M14, M22 | Only for standard thread | Fine thread moved to ISO 8673.
The dip-spin process typical of zinc-flake coatings can have a negative effect on the trueness to gauge in the case of small threads. For this reason, it is possible to ensure the screwability of size M5 threads, but not trueness to gauge.
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