Beryllium copper (BeCu) alloy C17200, also known as Alloy 25, has superb electrical and thermal conductivity and extremely ductile. It is commonly used in parts that require high strength and electrical conductivity such as musical instruments, precision measurement devices, bullets and aerospace.

Alloy C17200 Specifications:

Sheet / Plate / Strip: ASTM B194, ASTM B 194, SAE J463, SAE J461
Seamless Pipe / Tube:  AMS 4535, ASTM B643
Round / Flat bar:  ASTM B196, AMS 4650, AMS 4651, AMS 4533, MIL C 21657, SAE J463, SAE J461
Wire:  AMS 4725, ASTM B197, SAE J463, J461

Chemical Composition:







(nominal 98.1%)


0.2 max

0.2 min

0.2 max

Mechanical Properties:

Density lb/in³ 0.302
Elastic Modulus (10⁶ psi) 19
Coefficient of Thermal Expansion (in./in./°F) 9.7 x10⁶
Thermal Conductivity (btu/°F) 56
Elongation at Break, % 10
Melting Temperature °F 1600-1800
Tensile Strength ksi 165-200
Yield Strength 0.2% offset ksi 140-175
Elongation 27
Hardness (HB) 70-120


BeCu alloy C17200 combines high strength with non-magnetic and non-sparking properties. It’s typically used in the electronics, automotive, telecommunications, aerospace and oil and gas applications such as:

  • Electronic connector contacts
  • Telecommunications products
  • Small springs
  • Computer components