ASTM B221M-21

1.1''This specification covers aluminum and aluminum-alloy extruded bars, rods, wires, profiles, and tubes in the aluminum alloys (Note 1) and tempers shown in Table 2.

1.2''Alloy and temper designations are in accordance with ANSI H35.1/H35.1M. The equivalent Unified Numbering System alloy designations are those of Table 1 preceded by A9, for example, A91100 for Aluminum 1100 in accordance with Practice E527.

1.3''For acceptance criteria for inclusion of new aluminum and aluminum alloys in this specification, see Annex A2.

1.4''This specification is the metric counterpart of Specification B221.

1.5''The values stated in SI are to be regarded as standard. No other units of measurement are included in this specification.

1.6''This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.