An easy way to remember sheet metal thickness is that the higher the gauge number, the thinner it is. The thicker the sheet metal, the higher the cost tends to be. Metals such as copper ...

Tabs must be at least 0.126 inches (3.2 mm) thick, or two times the material’s thickness, whichever is greater. Tab length should be no larger than 5 times its width. Sheet-metal parts may have ...