This is known as the manufacturers standard gage for sheet steel.
25 gauge sheet metal thickness.
Sheet metal gauge size chart gauge or gage sizes are numbers that indicate the thickness of a piece of sheet metal with a higher number referring to a thinner sheet.
Sheet metal thickness gauges for steel are based on a weight of 41 82 pounds per square foot per inch of thickness.
Sheet metal gauge thickness chart to mm inch comversation gauge number standard steel galvanized steel stainless steel aluminum brass copper in mm in mm in mm in mm 3 0 2391 6 073 0 2294 5 827 4 0 2242 5 095 0 2344 5 954 0 2043 5 189 5 0 2092 5 314 0 2187 5 555 0 1819 4 62.
For other materials such as aluminum and brass the thicknesses will be different.
When working with sheet metal the term gauge is often used.
Gague are used to specify the thickness of a metal sheet.