ISO 6508-3 is the ISO standard that specifies a method for calibrating the reference blocks used for the indirect and daily verification of Rockwell hardness testing machines and indenters, as specified in ISO 6508-2. The current edition is ISO 6508-3:2023.
Besides the block calibration itself, the standard sets requirements for the Rockwell machines and indenters used to calibrate reference blocks, and specifies methods for calibrating and verifying them. It treats hard metal as the standard material for ball indenters. For a testing lab, this part explains where the values on its Rockwell blocks come from. Labs usually check that each block certificate cites the current edition and the scale they test on before using the block for daily or indirect checks.
Reference blocks and accessories, such as our hardness test blocks, indenters and accessories, are used for the daily and indirect verification of Rockwell testers that work to the ISO 6508 series. If you need help matching ISO 6508-3 requirements to your parts or setup, contact our team.
