---
code: "ASTM E18"
title: "Standard test methods for Rockwell hardness of metallic materials"
institution: "ASTM"
category: "material-testing"
revision: "2022"
scope: "Provides Rockwell hardness test procedures for metallic materials, including equipment verification, indentation procedures, and conversion guidance used in North American specifications and supplier quality systems."
testMethod: "Uses preliminary and total force sequences with diamond conical or ball indenters on regular and superficial scales; hardness is derived from depth difference measurements after defined force cycles."
specimenRequirements: "Specimens shall be thick enough to prevent bulging or marking on the opposite surface. Surfaces must be smooth and free of features that disturb indentation depth measurement; support must be rigid."
url: "https://vectorbtc.com.tr/resources/standards/astm-e18/"
---

ASTM E18 is frequently referenced alongside ISO 6508 for global supply chains serving ASTM-oriented customers.