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Beryllium Copper Balls

Beryllium Copper Balls
Copper has fantastic heat and electrical conductivity. Copper ballsare not recommended where they are exposed to corrosive agents or high mechanical stress. Copper balls are sensitive to corrosion from a variety of agents and is a soft metal.

Beryllium Copper balls are used in a wide range of applications requiring very high strength and stiffness with good conductivity. Typical uses include electrical/electronic connectors, bearings, and corrosion resistant applications.

(Beryllium Copper)
Copper Alloy No. C17510

Chemical Composition % by weight

Copper (incl. Silver)
97.8 Nominal
.10 Maximum
1.4 Minimum
.30 Maximum
.20 Maximum
.20 Minimum
.20 Maximum

Material Properties

Precipitation hardened alloy with good thermal conductivity and high hardness. Not suitable for case hardening or nitrating. 


Hardware: Fuse clips, fasteners, springs, switch parts, relay parts, electrical conductors.

Industrial: Welding equipment. 

Mechanical Properties

Typical for rod in HT temper

Hardness* Rockwell B Scales 98
Tensile Strength** KSI 115
Yield Strength** KSI 110
Elongation** % in 2 inch 14

*Hardness conversions are approximate

**Test values are nominal approximations and depend on specimen size and orientation.

Physical Properties

Thermal Conductivity BTU/ (sq ft-ft-hr-F) 120-150
Specific Heat BTU/lb/F @ 68F .10
Thermal Expansion Per F from 68 F to 392 F .0000098
Density lb/cu in @ 68 F .317
Electrical Conductivity* (Annealed)** % IACS @ 68 F 45-48
Modulus of Elasticity KSI 19,000

*Cold worked and precipitation hardened condition

**Volume basis

The values listed above represent reasonable approximations suitable for general engineering use. Due to commercial variations in composition and to manufacturing limitations, they should not be used for specification purposes. See applicable A.S.T.M. specification references.

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