But how i can get the thickness for aluminum sheet. This chart is usually called the Steel Gauge Chart. MachineMfg. Reply. It is clear now about steel. Sheet Metal Knowledge Menu Sheet Metal Manufacturing and Services. The sheet metal thickness gauge for steel is based on a weight of 41.82 pounds per square foot per inch of thickness. Aluminum for gutters: 0.027" or 0.032" for seamless gutters and any other thickness for custom gutters. For example, 14 gauge stainless-steel is .07812 inches thick. Kynar Aluminum for metal roofing: 0.032" or 0.040". Tel: 800.400.7833 323.723.8836 Fax: 323.888.9866 2187 S. Garfield Avenue Los Angeles, CA 90040 The gauge number 14 holds no relevance to the actual measurements. Zinc: 0.7 mm, 0.8mm and 1.5 mm. steel: stainless stl. Below is a chart of sheet metal gauge to mm/inch, including standard steel, aluminum, and galvanized steel. Kynar Galvalume (Steel) for metal roofing and gutters: 24 gauge. Stainless steel: 26 gauge, 24 gauge, 20 gauge, 18 gauge, 16 gauge, 14 gauge, 1/8" and 1/4". Older Comments. 27 thoughts on “Sheet Metal Gauge Thickness Chart (Ga. History You Don’t Know)” Newer Comments. 7.179--8.164.172-9.150.156-10.135.141-11.120.125-12.105.109-13.090.094.093: 14.075.078.079: 15.067.070.071: 16.060.063 Sheet Metal Gauge Thickness Chart ( to mm/inch Comversation) Gauge Number Standard Steel Galvanized Steel Stainless Steel Aluminum, Brass, Copper in mm in mm in mm in mm 3 0.2391 6.073 0.2294 5.827 4 0.2242 5.095 0.2344 5.954 0.2043 5.189 5 0.2092 5.314 0.2187 5.555 0.1819 4.62 Most people working with steel sheet metals consult to a particular chart for reference when it comes to gauge number and thickness. gage no. Keeping a gauge conversion chart nearby is an easy way to determine the actual thickness of a sheet of metal in inches or millimeters. November 10, 2019 at 3:46 pm. alum. Thank you very much. It practically gives you the figures which indicate the sheet metal’s gauge and thickness in millimeter, inches and even fractional regular measurements. This is called the steel plate manufacturer’s standard gauge. Metal Gauge Thickness Conversion Chart. Abu hamza alnaser.