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Alcobra Metals, Inc. : Distributor of Specialty Metals

Bronze Product Guide

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Bronze is an alloy of metal that is copper-based with tin as the main additive. This is not a hard and fast rule, however - some bronzes have phosphorus, manganese, aluminum or silicon as the main alloying ingredient.

The primary traits of Bronze alloys are that of toughness, wear resistance, strength, corrosion resistance, electrical conductivity, and thermal conductivity. Depending on the alloy, there is a bronze for just about every application.

C932 / SAE 660 - Bearing Bronze (available in HollowBar, Round)
C954 - Aluminum Bronze (available in HollowBar, Rectangle, Round, Square)
C655 - Silicon Bronze (available in Round)

Bearing Bronze

SAE 660 is the most commonly used bronze in bushing and bearing applications. It is comparably easy to machine, and provides long life in applications where wear is a consideration.

Bearing Bronze (C932), a/k/a SAE 660

Minimum Properties

Ultimate Tensile Strength, psi 35,000
Yield Strength, psi 20,000
Elongation in 2" 10%
Brinell Hardness 65


Copper (Cu) 81.0 - 85.0%
Tin (Sn) 6.3 - 7.5%
Lead 6.0 - 8.0%
Zinc 2.0 - 4.0%

Aluminum Bronze

Aluminum bronzes are most valued for their higher strength and corrosion resistance as compared to other bronze alloys. These alloys are tarnish-resistant and show low rates of corrosion in atmospheric conditions, low oxidation rates at high temperatures, and low reactivity with sulfurous compounds and other exhaust products of combustion. They are also resistant to corrosion in sea water. They prevent colonization by marine organisms including algae, barnacles, and mussels.


Aluminum Bronze, C954

Minimum Properties

Ultimate Tensile Strength, psi 85,000
Yield Strength, psi 32,000
Elongation in 2" 12%
Brinell Hardness 170


Copper (Cu) 83.0% min
Iron (Fe) 3.0 - 5.0%
Aluminum (Al) 10.0 - 11.5%

Silicon Bronze

Silicon Bronze is a high-strength, highly corrosion resistant material with nonmagnetic properties. It is generally as strong as steel. Because of its composition, it is more difficult to machine. However, it is excellent for use in general marine applications, as well as pumps, heavy equipment, fittings, and boilers.

Silicon Bronze, C655

Minimum Properties

Ultimate Tensile Strength, psi 85,000
Yield Strength, psi 55,000
Elongation in 2" 20%
Rockwell Hardness B90


Copper (Cu) 97.0% min
Iron (Fe) 0.8% max
Manganese (Mn) 1.5% max
Nickel (Ni) 0.6% max
Lead (Pb) 0.5% max
Silicon (Si) 2.8 - 3.8%
Zinc (Zn) 1.5% max

Alcobra Metals states that all technical data is for comparison purposes only and is NOT FOR DESIGN. It has been compiled from sources we believe to be accurate but cannot guarantee. Please consult an Engineer.