... Chemical CompositionRockwellHardness at 20 C(68 F)Electrical Conductivity at 20 C(68 F) ThermalConductivity ... .Typical Application for C17200 Beryllium Copper Alloys:Electrical Industry: Electrical Switch and Relay Blades, Fuse Clips, Switch ... Screws, BoltsIndustrial: Pumps, Springs, Electrochemical, Shafts, Non Sparking Safety Tools, Flexible Metal Hose, Housings for Instruments, Bearings, Bushings, ...