UNIFIED NUMBERING SYSTEM (UNS)

A method for cross referencing the different numbering systems used to identify metals, alloys, and welding filler metals. With UNS, it is possible to correlate over 4400 metals and alloys used in a variety of specifications, regardless of the identifying number used by a society, trade association, producer, or user.

UNS is produced jointly by the Society of Automotive Engineers (SAE) and the American Society for Testing and Materials (ASTM). It cross references the numbered metal and alloy designations of the major organizations and systems, including Federal and military. Over 500 of the listed numbers are for welding and brazing filler metals that are classified by deposited metal composition. See Table U-1.

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