This specification covers steel strip, nickel-clad or nickel-plated on both sides, for use in electron tubes. The base metal shall be an aluminum-deoxidized low-carbon steel conforming to the prescribed chemical composition requirements for iron, carbon, manganese, phosphorus, and sulfur, as determined by chemical analysis. The nickel plating shall conform to the prescribed chemical composition for nickel plus cobalt. The nickel cladding, Grade 1 (UNS N02233), Grade 2 (UNS N02202), and Grade 3 (UNS N02253), shall conform to the prescribed chemical composition for nickel (plus cobalt), carbon, copper, iron, magnesium, manganese, silicon, sulfur, and titanium. The requirements for the following are specified: (1) bonding of cladding or plating, (2) thickness of Type I and Type II cladding or plating which shall be determined by metallographic examination, (3) strip temper, and (4) strip mass and dimensions such as width, edgewise bow, edge, and burr. The surface shall be as smooth and free of dirt, oxide, pits, scratches, seams, slivers, streaks, stains, scale, blisters, edge cracks, trimming burrs, and other defects. Requirements for coiling and spoiling, product marking, and packaging are given as well.