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STANDARD 6508-2
Fourth edition
2023-12
Metallic materials — Rockwell
hardness test —
Part 2:
Verification and calibration of testing
machines and indenters
Matériaux métalliques — Essai de dureté Rockwell —
Partie 2: Vérification et étalonnage des machines d'essai et des
pénétrateurs
Reference number
ISO 6508-2:2023(E)
© ISO 2023
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ISO 6508-2:2023(E)
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© ISO 2023
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Published in Switzerland
ii
© ISO 2023 – All rights reserved
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ISO 6508-2:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General conditions .1
5 Direct verification of the testing machine . 2
5.1 General . 2
5.2 Calibration and verification of the test force . 2
5.3 Calibration and verification of the depth-measuring system . 3
5.4 Calibration and verification of the testing cycle . 4
5.5 Calibration and verification of the machine hysteresis . 4
6 Indirect verification of the testing machine . 4
6.1 General . 4
6.2 Procedure . 4
6.3 Repeatability . 5
6.4 Bias . 7
6.5 Uncertainty of measurement . 7
7 Calibration and verification of Rockwell hardness indenters . 7
7.1 General . 7
7.2 Diamond indenter .
...