kõvaduskatse metalli teraskuuli või teemant-/kõvasulamkoonuse etteantud jõuga materjali sisse surumisega; kõvadused HRA, HRB, HRC jt (vt Rocwelli kõvadus, kõvaduskatse)
a method of determining the hardness of metals by indenting them with hard steel ball or diamond cone; known as Rockwell HRA, HRB, HRC hardness (see: Rockwell hardness, hardness test)
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