This is known as the manufacturers standard gage for sheet steel.
Carbon steel sheet metal gauges.
The equivalent thicknesses differ for each gauge size standard which were developed based on the weight of the sheet for a given material.
Carbon steel sheet thickness gauge thickness in wgt.
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For other materials such as aluminum and brass the thicknesses will be different.
To help this blog will explain the gauge system and features a sheet metal gauge chart.
When working with sheet metal it is common for the term gauge to be used someone unfamiliar with the gauge system may not understand what is meant by 18 gauge steel for example.
As the gauge number increases the material thickness decreases.
500 18 0 047 2 000 20 0 035 1 500 22 0 029 1 250 24 0 023 1 000 26 0 017 0 750 28 0 014 0 625 30 0 012 0 500 galvanized sheet thickness gauge thickness in.
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.