teraskuuli (läbimõõduga 1/16” s.o ca 1,58 mm) või teemant-/kõvasulamkoonuse (tipunurgaga 120º) katsetatavasse materjali sisse surumise teel (Rockwelli meetodil) määratav kõvadus, vastavalt HRA, HRB, HRC jt
hardness measured of metals by indententing them with hard steel ball or diamond cone; scales HRA, HRB and HRC
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