This Standard is a revision of ANSI H35.2(M)-2009, which consists of logical values for long-term metric userather than a restatement of ANSI H35.2 in metric terms. This latest (2013) revision consists of modification to thecolumn headings and pipe size units for extruded and drawn pipe to harmonize with ANSI/ASME standard; clarification on tolerance calculation for wall thickness (eccentricity) of extruded tube; and clarifications to table headings and footnotes.