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C31400

Stocked alloy
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✔ Standard-stocked product*

Continuous cast and drawn

C31400, or leaded commercial bronze, is a free machining brass with excellent electrical and thermal conductivity. Alloy C314 is resistant to corrosion and contains approximately 2% lead to impart free-cutting characteristics.

*H02 half hard temper is standard stocked.
C31400 spec sheet C31400 size schedule Weight calculator Standard products

C31400

Product description: Leaded commercial bronze
Tempers: H02 half hard
Solids: 3/8" to 2" O.D.
Hex: 3/8" to 2" O.D.
Standard lengths: 144"

Typical uses

Builders hardware: door knobs
Electrical: connectors for wire and cable, electrical plug-type connectors
Fasteners: nuts, screws
Industrial: pickling crates, pickling fixtures, pickling racks, screw machine parts

Similar or equivalent specification

CDA ASTM SAE AMS Federal Military Other
C31400 B140
B140M		       MIL-V-18436  

Chemical composition

Cu% Pb% Zn% Fe% Ni%
Chemical composition according to ASTM B140/B140M-12(2017)

Note: Cu + sum of named elements, 99.6% min. Single values represent maximums.
87.50-
90.50		 1.30-
2.50		  
Rem.		  
0.10		  
0.70

Machinability

Copper alloy UNS No. Machinability rating Density (lb/in3 at 68 °F)
C31400 80 0.319

Mechanical properties

Mechanical properties according to ASTM B140/B140M-12(2017)

C31400

H02 half hard

Size range: 1/2" diameter and under
Tensile strength, min Yield strength, at 0.5% extension under load, min Elongation, in 2 in. or 50 mm min Rockwell "B" hardness   Remarks
ksi MPa ksi MPa % typical HRB  
50 345 30 205 7 61  
Size range: over 1/2" diameter to 1" inclusive
Tensile strength, min Yield strength, at 0.5% extension under load, min Elongation, in 2 in. or 50 mm min Rockwell "B" hardness   Remarks
ksi MPa ksi MPa % typical HRB  
45 310 27 185 10 61  
Size range: over 1" diameter
Tensile strength, min Yield strength, at 0.5% extension under load, min Elongation, in 2 in. or 50 mm min Rockwell "B" hardness   Remarks
ksi MPa ksi MPa % typical HRB  
40 275 25 170 12 58  

Physical properties

Physical properties provided by CDA
  US Customary Metric
Melting point - liquidus 1900 °F 1038 °C
Melting point - solidus 1850 °F 1010 °C
Density 0.319 lb/in3 at 68 °F 8.83 gm/cm3 at 20 °C
Specific gravity 8.83 8.83
Electrical conductivity 42% IACS at 68 °F 0.246 MegaSiemens/cm at 20 °C
Thermal conductivity 104 Btu/sq ft/ft hr/°F at 68 °F 180 W/m at 20 °C
Coefficient of thermal expansion 68-572 10.2 ·10-6 per °F (68-572 °F) 17.6 ·10-6 per °C (20-300 °C)
Specific heat capacity 0.09 Btu/lb/°F at 68 °F 377.1 J/kg at 20 °C
Modulus of elasticity in tension 17000 ksi 117212 MPa
Modulus of rigidity 6400 ksi 44127 MPa

Fabrication properties

Fabrication properties provided by CDA
Technique Suitability
Soldering Excellent
Brazing Good
Oxyacetylene welding Not recommended
Gas shielded arc welding Not recommended
Coated metal arc welding Not recommended
Spot weld Not recommended
Seam weld Not recommended
Butt weld Fair
Capacity for being cold worked Good
Capacity for being hot formed Poor
Machinability rating 80

Thermal properties

Thermal properties provided by CDA
*Temperature is measured in Fahrenheit.
Treatment Minimum* Maximum*
Annealing 800 1200

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