Aluminum Sheet. Aluminum sheet metales in a variety of thicknesses and weights in many different grades. Ryerson offers heat treatable aluminum sheet grades, like the popular 6061 aluminum alloy, that can be used formercial applications that require strength, corrosion resistance and machinability, as well as non-heat treatable grades Aluminum Sheet - 3003, 5052, 6061. Available Stock Sizes: 1ft x 1ft, 1ft x 2ft, 1ft x 4ft, 2ft x 2ft, 2ft x 4ft, 4ft x 4ft, 4ft x 8ft, 4ft x 10ft or Cut to Size or Custom Shape. Ordering Note: Stock sizes may vary +/- 1/8". Please call if you need specific sizes. Aluminum sheets are bare, mill finish without PVC, so some M-D Building Products 3 ft. X 3 ft. Diamond Tread Aluminium Sheet - .025" Aluminum sheet with bright non-skid tread plate finish. Will not rust or corrode. Rugged tread plate design protects slippery areas, protects high traffic areas, tool box repairs, craft and hobby projects. Rmended for indoor or outdoor uses . E ...Speedy Metals stocks 3003, 5052, and 6061 aluminum sheet. Order online or call to speak with a representative.