Copper UNS Number and Alloys Specifications Table Chart

The Unified Numbering System Copper

The Unified Numbering System (UNS) is the accepted alloy designation system in North America for wrought and cast copper and copper alloy products. The three-digit system developed by the U.S. copper and brass industry was expanded to five digits following the prefix letter C and made part of the Unified Numbering System for Metals and Alloys.

Element Which Alloys
UNS Number
Copper, Copper Alloys
Zn (Zinc)
C2xxxx, C3xxxx, C4xxxx,
C66400 to C69800
Phosphor Bronzes
Sn (Tin)
Aluminum Bronzes
Al (Aluminum)
C60600 to C64200
Silicon Bronzes
Si (Silicon)
C64700 to C66100
Copper and Nickel, Nickel Silvers
Ni (Nickel)

In the designation system, numbers from C10000 through C79999 denote wrought alloys. Cast alloys are numbered from C80000 through C99999. Within these two categories, the compositions are grouped into the following families of coppers and copper alloys:

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