ISO 6508 standard is for Metallic materials Rockwell hardness test, ISO 6508 consists of the following parts, under the general title Metallic materials — Rockwell hardness test:
ISO 6508-1 Part 1: Test method
ISO 6508-2 Part 2: Verification and calibration of testing machines and indenters
ISO 6508-3 Part 3: Calibration of reference blocks
ISO 6508-1 Test method scope:
ISO 6508 specifies the method for Rockwell regular and Rockwell superficial hardness
tests for scales A, B, C, D, E, F, G, H, K, 15N, 30N, 45N, 15T, 30T, and 45T for metallic materials and is applicable to stationary and portable hardness testing machines.
For specific materials and/or products, other specific International Standards apply (for instance,ISO 3738-1 and ISO 4498).
ISO 6508-2 Calibration of Verification and calibration of testing machines and indenters scopes:
ISO 6508-2 specifies a method of verification of testing machines for determining Rockwell
hardness (scales A, B, C, D, E, F, G, H, K, N, T) in accordance with ISO 6508-1.
It specifies a direct method for checking the main functions of the machine operation and an indirect method suitable for the overall checking of the machine.
The indirect method may be used on its own for periodic routine checking of the machine in service If a testing machine is also to be used for other methods of hardness testing, it shall be verified independently
for each method.
This part of ISO 6508 is applicable to portable hardness testing machines.
ISO 6508-3 Calibration of reference blocks scope:
ISO 6508-3 specifies a method for the calibration of reference blocks to be used for the indirect verification of Rockwell hardness testing machines (scales A, B, C, D, E, F, G, H, K, N, T), as specified in ISO 6508-2.