Hexagon head serrated screw with flange 100 steel with silver zinc-flake coating (ZFSHL)

Standard metric thread

Strength class 100 (approx. strength class 10.9)

Surface:

ZFSHL: Zinc flake coating with lubrication that alters the friction coefficient (friction coefficient: 0.09-0.14)

Chromium (VI)-free:

Complies with the EU End of Life Vehicles Directive

Corrosion resistance:

M4, M5 approx. 240 h / ≥ M6 approx. 480 h / ≥ M10 approx. 720 h, base metal corrosion in accordance with DIN EN ISO 9227-NSS

The specified corrosion resistances apply for corrosion tests in accordance with DIN EN ISO 9227-NSS (salt spray tests), at the earliest 24 h after coating, in the "as coated" state, i.e. before sorting, packaging, transporting and/or assembly. Inevitable handling and assembly processes may reduce these values. Applying the corrosion resistance values resulting from the salt spray test to real assembly and operating conditions is not possible in the majority of cases. When designing a connection, both the combined materials - and, if necessary, coatings - as well as the environmental conditions during operation must be considered by the designer in the selection of a suitable corrosion protection coating.

Working principle of locking ribs:

During tightening, the counter-material is "rolled" in the area of the bolt contact surface by the locking ribs. This causes a surface-hardening plastic deformation. No significant settling is detected after the tightening process is complete. The locking ribs limit the amount of settling for the connection and therefore reduce the loss of pretensioning force.