Official Answer
Answer
Beryllium Copper (UNS C17200) is used for its excellent electrical conductivity and high strength. It can operate effectively up to approximately $400^{\circ}F$ ($204^{\circ}C$). Beyond this temperature, the material begins to over-age, leading to a rapid loss of tensile strength and elastic modulus. In electrical connectors, the ring serves as a retention device that must also withstand thermal cycling. Its thermal expansion coefficient ($α \approx 9.4 · 10^{-6} / ^{\circ}F$) must be matched with the housing material to prevent loosening at high temperatures. Unlike steel, BeCu is non-sparking and non-magnetic, making it ideal for volatile aerospace environments.
