ASTM E8 / E8M is the most common test method for determining the tensile properties of metallic materials. First released in 1924, it was originally named ASTM E8-24T and is the oldest actively-used standard for the testing of metals. As with most standards, ASTM E8 has often undergone frequent, minor changes. Recently, however, one of these changes has been significant. Prior to 2011, ASTM E8 / E8M was divided into two separate standards: E8 for imperial unit users and E8M for metric users. The two standards have now been combined for the sake of simplicity into ASTM E8 / E8M.