C260 Cartridge Brass (CuZn30)

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Overview

Alloy C260 is commonly used for electrical components, electronic parts, and mechanical fasteners. The alloy has good strength but poor stress relaxation characteristics and does not make a particularly good spring material. Although it has good conductivity, the solderability of the alloy is severely impaired by its high zinc content.

Physical Properties

Annealing Range (Min) 800 °F
Annealing Range (Max) 1400 °F
Density 0.308 lb/in³
Electrical Resistivity (Annealed) 37 Ω·cir-mil/ft @ 68 °F
Electrical Conductivity (Annealed) 28% IACS @ 68 °F
Thermal Conductivity 70 Btu/ft²/ft·hr/°F @ 68 °F
Coefficient of Thermal Expansion 11.1 per °F (68-572 °F)
Modulus of Elasticity (Tension) 16 ksi
Modulus of Rigidity (Tension) 6 ksi
Melting Point (Solidus) 1,700 °F
Melting Point (Liquidus) 1,900 °F
Annealing Range (Min) 427 °C
Annealing Range (Max) 760 °C
Density 8.94 gm/cm³
Electrical Resistivity (Annealed) 6.16 µΩ·cm @ 20 °C
Electrical Conductivity (Annealed) 0.16 MS·cm @ 20 °C
Thermal Conductivity 121 W/m·K @ 20 °C
Coefficient of Thermal Expansion 20 per °C (20-300 °C)
Modulus of Elasticity (Tension) 110 Mpa
Modulus of Rigidity (Tension) 41 Mpa
Melting Point (Solidus) 927 °C
Melting Point (Liquidus) 1,038 °C

Round Wire

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
1/8 Hard H00 50.0 65.0 .0010 - .1285 inch
1/4 Hard H01 62.0 77.0
1/2 Hard H02 79.0 94.0
3/4 Hard H03 92.0 107
Hard H04 102 117
Extra Hard H06 115 129
Spring H08 120  
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
1/8 Hard H00 340 450 .0254 - 3.264 mm
1/4 Hard H01 420 540
1/2 Hard H02 540 650
3/4 Hard H03 630 740
Hard H04 700 810
Extra Hard H06 790 890
Spring H08 820  

Square Wire

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
1/8 Hard H00 50.0 65.0 .0100 - .0808 inch 
1/4 Hard H01 62.0 77.0
1/2 Hard H02 79.0 94.0
3/4 Hard H03 92.0 107
Hard H04 102 117
Extra Hard H06 115 129
Spring H08 120  
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
1/8 Hard H00 340 450 .2540 - 1.905 mm
1/4 Hard H01 420 540
1/2 Hard H02 540 650
3/4 Hard H03 630 740
Hard H04 700 810
Extra Hard H06 790 890
Spring H08 820  

Rolled Flat

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
1/4 Hard H01 49.0 59.0 Thickness:
.0100 - .0500 inch

Width:
.0150 - .2500 inch
1/2 Hard H02 57.0 67.0
3/4 Hard H03 64.0 74.0
Hard H04 71.0 81.0
Extra Hard H06 83.0 92.0
Spring H08 91.0 100
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
1/4 Hard H01 330 410 Thickness:
.2540 - 1.905 mm

Width:
.3810 - 6.350 mm
1/2 Hard H02 390 470
3/4 Hard H03 440 520
Hard H04 480 560
Extra Hard H06 570 640
Spring H08 620 690

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