Gauge differs between ferrous iron based metals and nonferrous metals such as aluminum or copper.
Copper sheet gage thickness.
The equivalent thicknesses differ for each gauge size standard which were developed based on the weight of the sheet for a given material.
For different materials of steel the same gauge will also correspond to different mm.
40 mil 18 gauge 040 18 gauge copper sheeting is heavyweight copper.
As with steel as the gauge gets higher the thickness gets lower.
It is approximately twice as thick as 22 mil copper and weighs approximately 2 pounds per square foot.
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.
Unlike with steel i can t find a set standard for tolerances for sheets of this material.
Commonly used steel sheet metal ranges from 30 gauge to about 7 gauge.
For example 18 gauge steel according to a gauge conversion chart is 0 0478 inch or 1 214 millimeter.
Gauge when applied to copper brass or silver means a different set of thicknesses however.
8 gauge 4 191 mm aluminum brass copper.
It is approximately twice as thick as 22 mil copper and weighs approximately 2 pounds per square foot.
A gauge conversion chart can be used to determine the actual thickness of sheet metal in inches or millimeters.
8 gauge 4 115 mm.
It s based on the american or brown and sharpe wire gauge standard.