Tag Archives: depth of indentation

Rockwell Hardness Scale

Hardness is a materials characteristic and not a fundamental physical property. Knowing the hardness of any metal or alloy is important since hardness value is in correlation to other properties such as materials size and thickness. The Rockwell hardness test is a measurement based on the net increase in depth of impression as a load is applied. Hardness numbers have no units and are commonly given in the R, L, M, E, and K scales. The higher the number in each of the scales means the harder the material. The Rockwell hardness test worldwide adoption likely resulted from the test …

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