Rockwell hardness (RH)

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Standard method for measuring hardness (resistance to penetration) of materials, expressed as a number assigned to the depth of penetration of a diamond cone or steel ball. There are several scales of Rockwell hardness of which the A (for extremely hard materials), B (for medium hardness materials), and C (for the material reading over 100 on the B-scale) are the most common. Hardened tool steel, for example, typically reads 62 on the C scale, and is identified as 62Rc.

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