Phosphor Bronze

Phosphor Bronzes contains copper, tin and phosphorous. The addition of tin increases the corrosion resistance and strength of the alloy. The phosphorous increases the wear resistance and stiffness of the alloy. Leaded phosphor bronzes combine good strength and fatigue resistance with good machinability.

Technical Specification Phosphor Bronze
Nominal Composition

Sn: 4.5 - 5.5

P: 0.02 - 0.40

Cu: Balance


0.320 lb./in3

Modulus of Elasticity (E)

15x 106 psi

Modulus of Rigidity (G)

6.3 x 106 psi

Coefficient of Expansion

9 µin/in.-°F (200°F)

Electrical Resistivity

5.2 µΩ.in

Thermal Conductivity

68 Btu/(hr/ft2/in/°F)

Min Size

5.000 in (0.080 mm)

Max Temp

95oC (200oF)


They are widely used in spring washers as it has high wear resistance and corrosion resistance