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How are Aluminum sheet metal gauges used? Gauges are used to specify the thickness of a Aluminum sheet metal. Gauges are neither standard nor metric and the values are independent of those measurement systems. A gauge conversion chart can be used to determine the actual thickness of sheet metal in inches or millimeters. For example, 18 gauge steel, according to a gauge conversion chart, is 0.0478 inch or 1.214 millimeter. The gauge number “18” holds no relevance to the actual measurements.
There are several different gauge systems used today, with specific gauge designations used for specific metal types. For example, in one gauge system, 18 gauge steel measures 0.0478 inches thick, but 9 gauge aluminum sheet thicknesses is .1144 inches thick. Because of the varying thicknesses, a gauge chart should be used to ensure the metal meets the required dimensions.

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