Optimum Spring manufactures extension, torsion and compression springs with Phosphor Bronze Grade A ASTM B 159 - Spring Wire Properties
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Phosphor Bronze Grade A ASTM B 159 - Spring Wire Properties

Copper-base alloys are important spring materials because of their good electrical properties combined with their excellent resistance to corrosion. Although these materials are more expensive than the high-carbon and the alloy steels, they nevertheless are frequently used in electrical components and in subzero temperatures. All copper-base alloys are drawn to the American wire gage (same as Brown & Sharpe gage) and are nonmagnetic.


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Phosphor Bronze
Grade A
ASTM B 159
Nominal Chemistry
Cu94.0-96.0%
Sn4.0-6.0%
Minimum Tensile Strength
psi x 103
105-145
E - Modulus of Elasticity
psi x 106
15
Design Stress % Minimum Tensile 40
G - Modulus in Torsion
psi x 106
6.25
Maximum Operating Temperature
°F
200
Rockwell Hardness B98-104
Density
lb/in3
0.32
Shear Modulus
c GPa
11600 80.0
Method of Manufacture
Chief Uses
Special Properties
Cold drawn. Good corrosion resistance and electrical conductivity.
Equivalent or Common Trade Names Phosphore Bronze
ASTM B159
ASTM B139
UNS C51000
QQ-W-321
SAE J463
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