The equivalent thicknesses differ for each gauge size standard which were developed based on the weight of the sheet for a given material.
Gi sheet metal gauge.
For a more comprehensive gauge chart you can check out our sheet metal gauge chart here.
The gauge number 18 holds no relevance to the actual measurements.
Converting sheet metal gauge numbers to millimeters is as simple as following the chart below.
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.
The following sheet metal gauge size reference chart gives the weight and thickness of sheet metal given as a gauge sometimes spelled gage and indicates the standard thickness of sheet metal and wire for most materials as the gauge number increases the material thickness decreases.
For example 18 gauge steel according to a gauge conversion chart is 0 0478 inch or 1 214 millimeter.
Galvanized gi sheet metal gauge to inch mm thickness.
Typically the even number gauges are used more frequently.
This chart covers the common and uncommon sheet metal sizes for steel aluminum and galvanized steel.