As the gauge number increases the material thickness decreases.
10 gauge steel.
Sheet metal thickness gauges for steel are based on a weight of 41 82 pounds per square foot per inch of thickness.
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The values differ because gauge is a measurement of weight not thickness.
The manufacturers standard gauge for sheet steel is based on an average weight of 41 82 pounds per square foot per inch thick.
For other materials such as aluminum and brass the thicknesses will be different.
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10 gauge shells.
The manufacturers standard gage provides the thicknesses for standard steel galvanized steel and stainless steel.
The gauge number 18 holds no relevance to the actual measurements.
Thus a 10.
Ten gauge galvanized steel is 0 1382 inch thick and 10 gauge stainless steel is 0 1406 inch thick.
The equivalent thicknesses differ for each gauge size standard which were developed based on the weight of the sheet for a given material.
For example 18 gauge steel according to a gauge conversion chart is 0 0478 inch or 1 214 millimeter.