Brass Rods and Sections—Compositions, Properties and Standards

Brass rods and sections account for virtually all of the wrought bar material used in engineering and industry including round rod, hexagon, square bar, flat bar and hollow sections.

The variety of cross section and the size ranges available for brass rods and sections means these product forms represent the largest range of material grades of any of the brass containing standards. Within the four BS EN standards listed below you will be able to find a brass for virtually every engineering sector.

The standards contain different types of brass including binary brasses with just copper and zinc, leaded brasses and higher alloyed grades, such as manganese bronzes and aluminium brasses. This gives designers options for a wide range of mechanical, physical and fabrication attributes – excellent machinability, very good hot or cold formability, enhanced mechanical properties and corrosion resistance.

As a guide, the alpha brasses (containing a minimum of 63% copper) generally offer a good cold workability. The leaded brasses are commonly used for machinability, with the 3% lead-containing brass being the free-machining grade which sets the standard for all other copper alloys. The addition of aluminium, tin and arsenicenhances corrosion resistance, and addition of aluminium, manganese, tin and nickel enhances strength and wear resistance.

The table below is designed to assist with the selection of grade for brass rods and sections by providing compositions, mechanical properties and some general remarks.  The table also includes EN brass grades previously included in BS 2874 ‘Specification for copper and copper alloy rods and sections (other than forging stock)’ to allow for completeness and continuity.

  • EN 12163 ‘Copper and copper alloys—Rod for general purposes’
  • EN 12164 ‘Copper and copper alloys—Rod for free machining purposes’
  • EN 12167 ‘Copper and copper alloys—Profiles and rectangular bar for general purpose’
  • EN 12168 ‘Copper and copper alloys—Hollow rod for free machining purposes’

Compositions given in the tables below are based on the EN designation. Composition ranges may be outside those of previous BS specifications, therefore compliance should be checked before assuming suitability for applications. Note that not all elements listed as impurities are shown here. For the full chemical composition you should refer to the standard or the Copper and copper alloys. Compendium of compositions and products PD CEN/TS 13388.

For more detail, the appropriate standard(s) should be consulted. Visit our page with details of standards and links to the BSI shop.

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Brass Rods and Sections—Compositions, Properties and Standards

EN
Number
EN
Symbol
Nearest
Old BS
Equiv.
Cu
%
Al
%
Fe
%
Mn
%
Pb
%
Si
%
Others
%
Zn
%
0.2%
Proof
Strength
(N/mm2)
Tensile
Strength
(N/mm2)
Elongation
%
Hardness
(HV)
Remarks   
CW503LCuZn20CZ10379.0-81.00.020.05-0.05-0.3 NiRem.90-460340-65050-570-170Can be deformed extensively by cold working.
CW505LCuZn30CZ10669.0-71.00.020.05-0.05-0.3 NiRem.90-480370-77055-370-190Can be deformed extensively by cold working.
CW507LCuZn36CZ10763.5-65.50.020.05-0.05-0.3 NiRem.90-480370-77055-370-190Can be deformed extensively by cold working.
CW509LCuZn40CZ10959.0-61.50.050.2-0.2-0.3 NiRem.120-280340-46045-2590-15060/40 brass will withstand limited amount of cold working and bending.
CW510LCuZn42 -57.0-59.00.050.3 -0.2 -0.3 NiRem.220-350360-50020-295-170Lead-free, machinability index 50%.
CW511LCuZn38As -61.5-63.50.050.1 -0.2 0.02-0.15 As
0.3 Ni
Rem.200-250280-40030-870-135Dezincification resistant.
CW601N CuZn35Pb2 CZ131
62.0-63.5
0.050.1 -1.6-2.5
-0.3 NiRem. 140-450
330-570
45-5
70-160
The higher copper and lower lead contents of these alloys improves ductility while retaining free machining characteristics. Can be used for cold heading, extreme riveting. Also known as free cutting brass.
CW602NCuZn36Pb2AsCZ13261.0-63.00.050.1 0.11.7-2.80.02-0.15 As
0.3 Ni
Rem.110-140310-37045-3570-80Brass with good hot ductility which is then heat treated to give excellent resistance to dezincification.
CW603NCuZn36Pb3CZ12460.0-62.00.050.3-2.5-3.5-0.3 NiRem.140-320340-52040-570-160Excellent machinability combined with sufficient ductility for some cold work. Also known as free cutting brass.
CW606NCuZn37Pb2CZ131
61.0-62.00.050.2-1.6-2.5
-0.3 NiRem. 140-450
330-570
45-5
70-160
The higher copper and lower lead contents of these alloys improves ductility, while retaining free machining characteristics. Can be used for cold heading, riveting. Also known as free cutting brass.
CW608NCuZn38Pb2CZ12060.0-61.00.050.2-1.6-2.5-0.3 NiRem.140-320340-52040-1590-160Excellent machinability combined with sufficient ductility for some cold work. Also known as free cutting brass.
CW610NCuZn39Pb0.5CZ137
59.0-60.50.050.2-0.2-0.8-0.3 NiRem.120-280340-46045-2590-15060/40 brass will withstand limited amount of cold working and bending.
CW611NCuZn39Pb1CZ12959.0-60.00.050.2-0.8-1.6-0.3 NiRem.120-280340-46045-2090-140The higher copper and lower lead contents of these alloys improves ductility, while retaining free machining characteristics. Can be used for cold heading, riveting. Also known as free cutting brass.
CW612NCuZn39Pb2CZ12859.0-60.00.050.3-1.6-2.5-0.3 NiRem140-320

340-520
40-15
90-160
Excellent machinability combined with sufficient ductility for some cold work. Also known as free cutting brass.
CW614NCuZn39Pb3CZ121-Pb357.0-59.00.050.3-2.5-3.5-0.3 NiRem.110-260370-46035-1590-160The most suitable material for high-speed machining, but has limited ability to be cold worked. The hardness of sections is typically 115 HV.
CW617NCuZn40Pb2CZ12257.0-59.00.050.3-1.6-2.5-0.3 NiRem.140-310350-54040-1590-160Excellent machinability combined with sufficient ductility for some cold work. Standard hot forging brass. Also known as free cutting brass.
CW623N CuZn43Pb2CZ13055.0-57.0
0.050.3-1.6-3.0
-0.3 NiRem. 160-200
370-430
35-25
90-120
The aluminium containing alloy has a bright yellow colour on the surface of extruded sections, while the manganese containing alloy may be toned to a chocolate brown colour. This brass gives an accentuated uniform improvement to natural oxidation effects and is used for architectural sections.
CW624NCuZn43Pb2AlCZ13055.0-57.0
0.05-0.50.3-1.6-3.0
-0.3 NiRem. 160-200
370-430
35-25
90-120
The aluminium containing alloy has a bright yellow colour on the surface of extruded sections, while the manganese containing alloy may be toned to a chocolate brown colour. This brass gives an accentuated uniform improvement to natural oxidation effects and is used for architectural sections.
CW625N CuZn35Pb1.5AlAs -62.0-64.00.5-0.70.3 0.1 1.2-1.6-0.02-0.15 As
0.2 Ni
Rem.200-250280-40030-570-135Dezincification resistant. Approved for drinking water contact under 4MS.
CW626NCuZn33Pb1.5AlAs -64.0-66.00.8-1.00.3 0.1 1.2-1.7-0.02-0.15 As
0.2 Ni
Rem.200-250280-40030-570-135Dezincification resistant. Approved for drinking water contact under 4MS.
CW705RCuZn25Al5Fe2Mn2PbCZ11665.0-68.04.0-5.00.5-3.00.5-3.00.2-0.8-1.0 NiRem.420-490690-77020-15170-220The alloying additions produce improved mechanical properties. Lead improves machinability. Used for fasteners, valve parts.
CW707RCuZn30AsCZ105 and CZ12669.0-71.00.020.050.10.07-0.02-0.06 AsRem.110-170200-35055-2070-90Brass with good hot ductility which is then heat treated to give excellent resistance to dezincification. The addition of arsenic to 70/30 brass improves resistance to corrosion.
CW711RCuZn36Pb2Sn1CZ13459.5-61.5-0.1-1.3-2.2-0.5-1.0 Sn
0.3 Ni
Rem.125-170340-40040-20100-150Tin improves corrosion resistance, especially in sea water. Lead improves machinability. Also known as leaded Naval Brass.
CW712RCuZn36Sn1PbCZ11261.0-63.0-0.1-0.2-0.6-1.0-1.5 Sn
0.2 Ni
Rem.125-185340-43040-20100-160Tin improves corrosion resistance, especially in sea water. Lead improves machinability. Also known as Naval Brass.
CW713RCuZn37Mn3Al2PbSiCZ13557.0-59.01.3-2.31.01.5-3.00.2-0.80.3-1.31.0 Ni
0.4 Sn
Rem.230-340500-70010-5150-200The alloying additions produce improved mechanical properties. Lead improves machinability. Used for fasteners and valve parts. Silicon addition gives added wear resistance.
CW719RCuZn39Sn1CZ13359.0-61.0-0.1-0.2-0.5-1.0 Sn
0.2 Ni
Rem.155-280400-46030-20100-145Tin improves corrosion resistance, especially in sea water. Also known as uninhibited Naval Brass.
CW720RCuZn40Mn1Pb1CZ13657.0-59.00.20.30.5-1.51.0-2.00.10.6 NiRem.125-200340-50040-3080-115The aluminium containing alloy has a bright yellow colour on the surface of extruded sections, while the manganese containing alloy may be toned to a chocolate brown colour. This brass gives an accentuated uniform improvement to natural oxidation effects and is used for architectural sections.
CW721RCuZn40Mn1Pb1AlFeSnCZ11457.0-59.00.3-1.30.2-1.20.8-1.80.8-1.60.2-1.0 Sn
0.3 Ni
Rem.230-340430-59030-20110-175The alloying additions produce improved mechanical properties. Lead improves machinability. Used for fasteners and valve parts.
CW722RCuZn40Mn1Pb1FeSnCZ11556.5-58.50.10.2-1.20.8-1.80.8-1.60.2-1.0 Sn
0.3 Ni
Rem.230-340430-59030-20110-175The alloying additions produce improved mechanical properties. Lead improves machinability. Used for fasteners and valve parts.
CW724R CuZn21Si3P -75.0-77.00.05 0.3 0.05 0.102.7-3.50.2 Ni
0.02-0.10 P
Rem.350-450500-65015-10110-210Lead-free brass.
CW725R CuZn33Pb1AlSiAs -64.0-67.00.1-0.40.3 0.1 0.4-0.90.1-0.30.05-0.08 As
0.2 Ni
Rem.200-250290-40030-870-135Dezincification resistant. Approved for drinking water contact under 4MS.
Brass rods and sections—Compositions, Properties and Standardscopperalliance.org.uk

Table Notes:
Compositions are given as either a range or a maximum.
1N/mm2 = 1MPa