ASTM E140

ASTM E140 is the standard hardening conversion reference for metals, offering tables that relate Brinell hardness, Vickers hardness, Rockwell hardness, superficial hardness, Knoop hardness, Scleroscope hardness, and Leeb hardness. It matters because different hardness tests are often used across production and inspection, and this document helps users compare results in a consistent way. For quality teams, engineers, and labs, ASTM E140 supports clearer interpretation of hardness data and more reliable communication between methods.

ASTM E140 standard overview

The ASTM E140 standard is intended to provide conversion tables for hardness values measured by different test methods. Its technical context is centered on the relationship among common hardness scales used for metals, including Brinell, Vickers, Rockwell, superficial, Knoop, Scleroscope, and Leeb. As a reference document, it is typically used when results must be compared or translated across testing systems. That makes ASTM E140 a practical tool for standardized reporting and decision-making.

Where is ASTM E140 used?

ASTM E140 is commonly used in metal testing environments where hardness results may come from more than one type of instrument or method. It is useful in laboratories, receiving inspection, in-process checks, and product evaluation workflows that involve metallic materials. The standard may also support comparison of test results between suppliers, customers, and internal quality systems when hardness data must be understood in a common format. In these settings, ASTM E140 helps make test outcomes easier to interpret.

Practical importance of ASTM E140

In practice, ASTM E140 helps reduce confusion when hardness values are reported on different scales. That can improve consistency in compliance reviews, procurement specifications, and quality control records. It also supports more informed material comparison when one test method is not available or when historical data must be interpreted alongside newer results. By providing a recognized conversion reference, ASTM E140 can lower the risk of miscommunication and improve confidence in hardness-based decisions.

• Hardness conversion reference for metals
• Supports comparison across common test scales
• Useful for labs, inspection, and quality control
• Helps standardize hardness reporting