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.
Common Trade Names Phosphore Bronze
ASTM B159
ASTM B139
UNS C51000
QQ-W-321
SAE J463
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