The equivalent thicknesses differ for each gauge size standard which were developed based on the weight of the sheet for a given material.
Starrett sheet metal gauge chart.
Micrometers measure extremely short distances such as the thickness of a piece of sheet metal.
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Fixed gage standards a010120producttitle.
They are also used in clearance work as precision shims a010710productphoto01filename.
Gages measure height width angle radius thickness and other specific dimensions on parts.
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The most accurate thickness.
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For example 18 gauge steel according to a gauge conversion chart is 0 0478 inch or 1 214 millimeter.
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.
A gauge conversion chart can be used to determine the actual thickness of sheet metal in inches or millimeters.