Alloy C17510 Beryllium Copper, also known as alloy No. 3 or alloy class 3 cooper, referred as the best spring copper. This alloy offers good strength, high thermal conductivity and hardness characteristics. UNS C17510 copper has high elasticity, wear resistance, fatigue resistance and heat resistance after quenching and tempering. C17510 alloy is heat treatable, easy to weld and excellent corrosion resistance in the atmosphere and seawater

Alloy C17510 Specifications:

C17510 Beryllium Copper can be supplied fully hardened by our processing mill and is available in wrought product forms such as bars, rods, sheets and plates.

  • Sheet / Plate / Strip: ASTM B534, SAE J463, SAE J461
  • Seamless Pipe / Tube: SAE J463, J461
  • Rod/Bar: ASTM B441, ASTM B534

Chemical Composition:








(nominal 97.8%)


0.2 max

0.3 min

0.2 max


 Mechanical Properties:

Density lb/in³ 0.319
Elastic Modulus(10⁶ psi) 20
Coefficient of Thermal Expansion (in./in./°F) 9.8 x10⁶
Thermal Conductivity (btu/°F) 140
Melting Temperature °F 1900-1980
Tensile Strength, ksi 100-130
Yield Strength, 0.2% offset ksi 80-100
Elongation 10-25
Hardness (HR) 175-195


BeCu alloy C17510 is typically used in the applications that require high thermal or electric conductivity such as brushes, switches, relays, fasteners, connectors, thermostat spring sheets and other stress parts.