Wort des Tages
2 July 2026
case harden
verbMetallurgie
To impart greater hardness to the surface of a piece of metal.
Warum dieses Wort
The point is a split personality: a hard skin that resists wear over a core left tough enough to take shock. Harden the whole part through and gear teeth stop wearing and start snapping instead.
In use
We case harden the pins before they go in, otherwise the bushes chew them up inside a month.
Written by our editors to show how the term is used, not a recorded quotation.