The assessment of metallic materials’ Rockwell hardness and Rockwell superficial hardness using the Rockwell indentation hardness principle is covered by ASTM-E18 Standard. The standard outlines the specifications for Rockwell hardness testing equipment as well as the steps to take when conducting these tests. The indenter ball sizes were stated in units of inches, while the force levels were specified in kilograms-force (kgf) (in.).

According to this standard, force is measured in Newtons (N), and length is measured in millimetres in accordance with the International System of Units (SI) (mm). However, force numbers in kgf units and ball diameters in inch units are supplied for information, and much of the discussion in this standard refers to these due to historical precedent and ongoing general usage. The test principles, testing procedures, and verification procedures are essentially identical for both the Rockwell and Rockwell superficial hardness tests.

NextGen’s Universal Hardness Tester for Vickers / Knoop, Rockwell and Brinell comply ASTM E-18 Standard.

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