Wire/conductor sizes are also measured in gauge and are equivalent to the non-ferrous thicknesses listed below, but we have an article specific to wire gauge. It practically gives you the figures which indicate the sheet metal’s gauge and thickness in millimeter, inches and even fractional regular measurements. Use the chart below to convert standard gauge numbers in decimals of an inch for sheet steel, aluminum and stainless steel. The story of gauge. Aluminum for gutters: 0.027" or 0.032" for seamless gutters and any other thickness for custom gutters. Most homes in residential areas use 29-gauge metal panels. Click here for a Gauge to mm Conversion Chart.. As the gauge number increases, the material thickness decreases. 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 29 gauge steel (the standard in the post frame industry) has an average thickness of .0172 of an inch (with a minimum of .0142). The American Iron and Steel Institute (AISI) publishes the accepted measurement standards for steel thickness. The American Iron and Steel Institute (AISI) publishes the accepted measurement standards for steel thickness. A sheet metal gauge (sometimes spelled "gage") indicates the standard thickness of sheet metal for a specific material. Kynar Galvalume (Steel) for metal roofing and gutters: 24 gauge. The weight of 29-gauge metal roofing may differ, though, depending on the type of metal that you choose. For example, 21Ga. steel: stainless stl. 28 gauge steel has an average thickness of .0187 (minimum .0157) and 26 gauge is .0217 (minimum .0187). Metal Gauges Below you’ll find the info you need with our sheet steel, stainless steel and aluminum sheet metal charts. The table below provides conversion to inches. Mesteel - Steel Thickness Conversion Tables tables. For instance, stainless steel will have a difference in inches than carbon steel. Zinc: 0.7 mm, 0.8mm and 1.5 mm. 28 gauge steel has an average thickness of .0187 (minimum .0157) and 26 gauge is .0217 (minimum .0187). Sheet metal thickness gauges for steel are based on a weight of 41.82 pounds per square foot per inch of thickness. Convert Gauges, BWG, USG to inches and millimeters Kynar Aluminum for metal roofing: 0.032" or 0.040". Metal sheet thickness is measured in gauge. Sheet metal thickness is denoted by gauge, sometimes spelled gage, which indicates a standard thickness before processing. That’s why SCAFCO steel framing products are manufactured from 100% prime mill certified steel. Most people working with steel sheet metals consult to a particular chart for reference when it comes to gauge number and thickness. This chart is usually called the Steel Gauge Chart. gage no. SCAFCO’s products exceed industry standards as they are manufactured from 57 ksi steel in place of 50 ksi and G90 in place of G60 for 68 mil and heavier. 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