In most of the world sheet metal thickness is consistently specified in millimeters.
Stainless sheet metal gauge thickness.
Wire gauge is a measure for the size of a wire either in diameter or in cross sectional area.
For example 18 gauge steel according to a gauge conversion chart is 0 0478 inch or 1 214 millimeter.
In the u s the thickness of sheet metal is commonly specified by a traditional non linear measure known as its gauge.
Commonly used steel sheet metal ranges from 30 gauge to about 7 gauge.
The larger the gauge number the thinner the metal.
Gauge to thickness chart click here for a printable pdf chart gauge.
These will vary from british gauges with some exceptions.
A gauge conversion chart can be used to determine the actual thickness of sheet metal in inches or millimeters.
Gauge and weight chart for sheet steel galvanized steel stainless steel aluminum and strip tubing.