This specification establishes the requirements for copper-nickel-silicon alloy rods and bars in straight lengths produced from Copper Alloy UNS No. C64700. The materials for manufacture shall be cast billets or ingots of such soundness and structure as to be suitable for processing by hot extrusion or rolling, and finished by cold working, annealing, cooling, straightening, and precipitation heat treatment to produce finished products that achieve the required properties. Products shall be tested and shall adhere to dimensional (diameter, length, straightness, and edge contour), mechanical (tensile and yield strength, and elongation), electrical resistivity, and chemical composition requirements.