Beryllium Copper Springs

When considering a spring for a corrosive environment, Beryllium Copper (BeCu) is an ideal choice for a spring alloy. Beryllium Coppers are also known as spring copper which has the best combination of electrical conductivity, corrosion resistance, and mechanical strength necessary for numerous electronic and electro-mechanical devices.

C25 Product Offerings:

Copper alloy springs are not compatible with ammonium hydroxides or nitric acids, which may include acid chromates, Ferric Sulfide, and Ferric Chloride. There are various grades of Beryllium Copper, however, the most common alloy in spring making is C25 which falls under UNS designation C17200. C25 is available in different spring types and forms including: 

  • Round
  • Shaped Wire
  • Bar Form with various cross-sections.

Attributes of C25 Copper Alloy Springs

C25’s high tensile strength properties relative to other copper alloys make it an ideal material for the engineer to design the smallest spring package possible when a copper alloy is required. Its fatigue strength also makes it an ideal material for cyclic applications. Another attribute of Beryllium Copper is it retains its ductility in cryogenic environments.

Technical Specification Beryllium Cooper
Nominal Composition

Be: 0.2 - 0.6

Ni: 1.4 – 2.2

Cu: Balance


0.316 lb./in3

Modulus of Elasticity (E)

19x 106 psi

Modulus of Rigidity (G)

7.5 x 106 psi

Coefficient of Expansion

9.8 µin/in.-°F (200°F)

Electrical Resistivity

3.79 µΩ.cm

Thermal Conductivity

120 Btu/(hr/ft2/in/°F)

Min Size

0.003 in (0.080 mm)

Max Size

2.5 in

Max Temp

205oC (400oF)


Its non-magnetic properties make it ideal for down-hole wire line tools


Industries Using Beryllium Copper Springs

Like other copper alloys its nonmagnetic properties are ideal for medical or industrial applications as it is commonly used in MRI equipment or in directional drilling equipment. Its conductive properties make it an ideal candidate for a variety of different industries including:

Beryllium Copper C25 is not a one size fits all application, however, its combination of strength and corrosion-resistant properties makes it an ideal alloy for a significant amount of industrial uses.

Contact Us

The Coiling Tech team has extensive experience producing beryllium copper springs. We are available to answer any product questions you may have. For more information about copper alloy springs or to request a quote for your custom spring requirements, Contact Us today!