Rockwell hardness

Rockwell hardness

[′räk‚wel ′härd·nəs] (engineering) A measure of hardness of a material as determined by the Rockwell hardness test.

Rockwell hardness

Rockwell hardness tester A measure of the resistance of a material to indentation; determined by use of a machine which presses a steel ball or a spheroconical ball indentor into the material under arbitrarily fixed test conditions; expressed by the Rockwell hardness number—the higher the number, the harder the material.