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Rockwell scaleRockwell scale is a hardness scale based on the indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration of a preload (minor load). Different scales, denoted by a single letter, use different loads or indenters. The result is a dimensionless number noted as HRA, HRB, HRC, etc., where the last letter is the respective Rockwell scale. Larger numbers correspond to harder materials. When testing metals, indentation hardness correlates linearly with tensile strength. Citing Wikipedia.org
The Vickers hardness test Brinell scale
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