Historical
ISO 6508-3:2015
Metallic materials - Rockwell hardness test - Part 3: Calibration of reference blocks
ISO 6508-3:2015 specifies a method for the calibration of reference blocks to be used for the indirect and daily verification of Rockwell hardness testing machines, as specified in ISO 6508‑2:2015.
Attention is drawn to the fact that the use of hard metal for ball indenters is considered to be the standard type of Rockwell indenter ball. Steel indenter balls can be used only when complying with ISO 6508‑1:2015, Annex A.
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International Organization for Standardization [iso]
International Organization for Standardization [iso]