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Home » Products » C31400 Commercial Bronze » C31400 Leaded Commercial Bronze Round

C31400 Leaded Commercial Bronze Round

$0.34 – $9.61 in

C31400 Leaded Commercial Bronze finds use in hardware, electrical and industrial applications, as well as fasteners.

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SKU: C31400 Leaded Commercial Bronze Round Categories: C31400 Commercial Bronze, Commercial Bronze Products, Wrought Alloys
  • Description
  • Tolerances
  • Specifications
  • Chemical
  • Physical
  • Mechanical
  • Fabrication

Product Description

C31400 Leaded Commercial Bronze is a Morgan standard alloy and finds use in hardware applications, electrical applications, as well as fasteners and industrial applications. Uses include various electrical connectors, screws and nuts, pickling crates, fixtures and racks. It is also common in screw machine applications.

Other terms for this alloy are: Leaded Commercial Bronze; ASTM B140/140M Alloy 31400; MIL-V-18436

Notice: The weights listed are the best estimates of the actual weights we will ship. They are a combination of the calculated theoretical weights and an average of actual weights. Our weights are conservative to the heavier side but there may be slight variations in weight from bar to bar.

The Physical, Fabrication and Thermal Properties shown here represent reasonable approximations suitable for general engineering use. Due to commercial variations in compositions and to manufacturing limitations, they should not be used for specification purposes.

C31400 Tolerances (inches)

Diameter (inclusive)Standard Tolerance – plus or minus
Up to 0.500″0.0015
Over 0.500″ to 1.00″0.002
Over 1.00″ to 2.00″0.0025
Over 2.00″0.15% of the Diameter

Equivalent Specifications

ASTM B140/ B140M (Copper Alloy UNS No. 31400)

Reference Specifications

Mil-V-18436

Equivalent specifications are verified and updated annually.
Specifications shown are current as of May 4, 2010.

Chemical Composition (%)

CuPbFeNiZn
87.5 – 90.51.3 – 2.50.10 max.0.7 max.Remainder
Sum of all named elements = 99.6%

Physical Properties

EnglishMetric
Melting Point – Liquidus1900° F1038° C
Melting Point – Solidus1850° F1010° C
Density0.319 lb/in3 at 68° F8.83 gm/cm3 @ 20° C
Specific Gravity8.8308.83
Electrical Resistivity (Annealed)24.70 ohms-cmil/ft @ 68° F4.11 microhm-cm @ 20° C
Electrical Conductivity (Annealed)42%IACS @ 68° F0.246 MegaSiemens/cm @ 20° C
Thermal Conductivity104 Btu · ft/(hr · ft2·°F) @ 68° F180.0 W/m·°K @20° C
Coefficient of Thermal Expansion10.2 · 10-6 per °F (68-572° F)18.4 ·10-6 per °C (20-300° C)
Specific Heat Capacity0.090 Btu/lb/°F @ 68° F377.1 J/kg · °K @293° K
Modulus of Elasticity in Tension17,000 ksi117,000 MPa

Physical Properties provided by CDA

Mechanical Properties

Minimum Tensile Properties, English/Metric
Temper HO2 half hard
Nominal DiameterTensile StrengthYield Strength*Elongation**
Inches/mmksiMPaksiMPa%
½” and under/ 12 mm50345302057
Over ½ to 1”/12-25 mm incl453102718510
Over 1.00”/25 mm402752517012
Temper HO4 hard
Nominal DiameterTensile StrengthYield Strength*Elongation**
Inches/mmksiMPaksiMPa%
2” and under/50 mm53365402756

* Yield Strength at 0.5% Extension under Load, min. ksi/MPa
**Elongation in 4D
Chemical and Physical Properties shown here pertain to ASTM B140/B140M only.

Machinability Rating 80 (Free Cutting Brass = 100)

Fabrication Practices

SolderingExcellentCapacity for Being Cold WorkedGood
BrazingGoodCapacity for Being Hot FormedPoor
Oxyacetylene WeldingNot Recommended
Gas Shielded Arc WeldingNot RecommendedAnnealing Temperature – Minimum800° F or 427° C
Coated Metal Arc WeldingNot RecommendedAnnealing Temperature – Maximum1200° F or 649° C
Resistance Welding – SpotNot Recommended
Resistance Welding – SeamNot Recommended
Resistance Welding – ButtFair

Fabrication Practices provided by CDA

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340 East IL Route 22
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