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Recently developed microform m easurem ent techniques have reduced the measurement uncertainties in the geom etry of Rockwell diamond indenters. It is now possible to establish standard-grade Rockwell diamond indenters characterized by high geometric uniform ity, high hardness performance uniformity, interchangeability and reproducibility. By using the standard indenters under differen t national standard machines and a standardized testin g cycle, a world-wide uni® ed Rockwell hardness scale could be established with m etrological traceability , stability and reproducibility. Geometric measurements and hardness tests in ® ve laboratories have shown that tightly controlled indenter geom etry can signi® cantly im prove the consistency of Rockwell C hardness (HRC) measurements. These results support the feasibility of establishing a world-wide uni® ed HRC scale with an expanded uncertainty of approxim ately 6 0,2 HRC and without signi® cant bias with respect to an ideal scale.

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