Hot-rolled steel products can run from in thick to 18-gauge (0.0478 in) and still be considered as sheet, although many authorities consider any sheet-metal thickness of 0.250 in and greater as plate.

Sheet metal gauges run from under 0.001 in to 0.500 in ... down to 28 gauge (0.0148 in). Other sheet thicknesses are available as special-order mill-run products when the order is large enough. Large ...