The gauge number 18 holds no relevance to the actual measurements.
Gi sheet metal gauge.
The equivalent thicknesses differ for each gauge size standard which were developed based on the weight of the sheet for a given material.
Gauge or gage dimensions are numbers that indicate the thickness of a piece of sheet and a higher number refers to a thinner sheet.
For example 18 gauge steel according to a gauge conversion chart is 0 0478 inch or 1 214 millimeter.
A gauge conversion chart can be used to determine the actual thickness of sheet metal in inches or millimeters.
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.
This chart covers the common and uncommon sheet metal sizes for steel aluminum and galvanized steel.
Typically the even number gauges are used more frequently.
For a more comprehensive gauge chart you can check out our sheet metal gauge chart here.
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.