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Rockwell hardness test

   Also found in: Wikipedia 0.07 sec.
Rockwell hardness test [′räk‚wel ′härd·nəs ‚test]
(engineering)
One of the arbitrarily defined measures of resistance of a material to indentation under static or dynamic load; depth of indentation of either a steel ball or a 120° conical diamond with rounded point, ¹⁄₁₆, ⅛, ¼, or ½ inch (1.5875, 3.175, 6.35, 12.7 millimeters) in diameter, called a brale, under prescribed load is the basis for Rockwell hardness; 60, 100, 150 kilogram load is applied with a special machine, and depth of impression under initial minor load is indicated on a dial whose graduations represent hardness number.


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The Rockwell hardness test measures the depth of residual penetration by a steel or diamond cone under fixed load conditions.
 
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