ASTM-A240 | Standard Specification for Chromium and …
This document is correctly numbered ASTM A240/A240M because it features both inch-pound and metric measurements. This is notated in the document number (the A240/A240M means A240 inch-pound units/A240 Metric units). Because we have been tracking ASTM standards for so long (since the 1980's) you can look up the document either as ASTM …