Aluminum 6101-T61 Rectangular Bar 5" x 1/4" Retail Price

About 6101|Basically 6063 with minor chemistry tweaks to maximize electrical conductivity (55–60% IACS). The bus bar alloy. Used almost exclusively for electrical conductor applications like bus bars, power distribution, and switchgear. Half the weight of copper with over half the conductivity, which makes the math work for many electrical installations. Machines reasonably well for what it is. If you see 6101 in the shop, someone is making electrical components. Not a structural or general machining alloy.

About Rectangular Bar|Solid rectangular cross-section stock. Functionally similar to flat bar but typically available in thicker, chunkier profiles. The naming varies by supplier — what one calls rectangular bar, another calls flat bar. Used for keys, gibs, wear strips, brackets, and any part where a rectangular starting profile saves setup time versus milling from plate.