Full Name
Beryllium Copper, BeCu

Beryllium copper (BeCu), also known as copper beryllium (CuBe), beryllium bronze and spring copper, is a copper alloy with 0.5—3% beryllium and sometimes other elements. Beryllium copper combines high strength with non-magnetic and non-sparking qualities. It has excellent metalworking, forming and machining properties. It has many specialized applications in tools for hazardous environments, musical instruments, precision measurement devices, bullets, and aerospace.

Beryllium copper is a non-ferrous alloy used in springs, spring wire, load cells, and other parts that must retain their shape under repeated stress and strain. It has high electrical conductivity, and is used in low-current contacts for batteries and electrical connectors.

BeCu in Telecommunications

Beryllium-Copper (BeCu) is a very common material used in the manufacturing of coaxial connectors and adapters, particularly as the base material for the centre Pin or Socket. There are several reasons why BeCu is often the material of choice for these applications.

First, BeCu has excellent electrical conductivity, similar to brass, which makes it well suited for transferring high-frequency signals with minimal losses or distortions. BeCu also has a higher tensile strength compared to brass, which makes it more suitable for high-power applications where high current loads are expected. This higher strength also makes BeCu more resistant to deformation and wear over time, which can help to ensure reliable performance even in harsh operating environments.

Second, BeCu is highly resistant to corrosion and oxidation, which is important in applications where the connectors and adapters may be exposed to moisture or other corrosive substances. This property helps to ensure that the electrical contacts will maintain their performance over time and will not degrade due to environmental exposure.

In addition to its electrical and mechanical properties, BeCu is also relatively easy to machine and fabricate, similar to brass, which makes it well suited for producing connectors and adapters that require precise tolerances and intricate shapes. However, Beryllium-Copper (BeCu) is more expensive than brass which leads it to often only used in the most important component(s) within the connector. This is because BeCu is a more specialised and high-performance material and the production process for BeCu is more complex and costly.

Despite the higher cost, BeCu is often used in applications where high electrical and mechanical performance are critical as it has superior properties compared to brass in these areas. The higher cost is often justified by the improved performance and reliability that BeCu can provide, particularly in high-power and repeated mating applications.

8.26 g/cc
Tensile Strength, Yield
221 - 1172 MPa
Modulus of Elasticity
115 GPa
Tensile Strength, Ultimate
483 - 810 MPa
Elongation at Break
45 %
CTE, linear
16.7 µm/m-°C
Thermal Conductivity
118 W/m-K