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Annex C

The NIST SRM reference test blocks for the Rockwell C scale (HRC) are certified at three hardness levels; 25 HRC, 45 HRC, and 63 HRC, (SRMs 2810, 2811, and 2812, respectively). Because these test blocks are often used in situations where the highest measurement accuracy is desired, the first part C.1 of this Annex provides recommendations for the proper use of the SRMs. The second part C.2 of this Annex provides formulas for calculating the certified value for any location on the SRM as well as the average hardness of two or more arbitrary locations.

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