Rockwell scale

The Rockwell hardness test is a hardness test based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load compared to the penetration made by a preload. There are different scales, denoted by a single letter, that 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.

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