# Sheet Metal Gauge

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A sheet metal gauge (sometimes spelled "gage") indicates the standard thickness of sheet metal for a specific material. As the gauge number increases, the material thickness decreases.

Sheet metal thickness gauges for steel are based on a weight of 41.82 pounds per square foot per inch of thickness. This is known as the Manufacturers' Standard Gage for Sheet Steel. For other materials, such as aluminum and brass, the thicknesses will be different. Thus, a 10 gauge steel sheet which has a thickness of 0.1345 inches will weigh 41.82*0.1345 = 5.625 pounds per square foot.

Examples: 16 ga CRS is 2.5 pounds per square foot. For 18 ga CRS the weight is 2.0 pounds per square foot and for 20 ga CRS the weight is 1.5 pounds per square foot.

Standard sheet metal gauges

 Gauge Steel Carbon Steel eh Galvanized Steel Stainless Steel Aluminum Steel (mm) 07 0.179 - - - - 4.547 08 0.165 0.1644 0.1681 0.1719 0.1285 4.191 09 0.150 0.1495 0.1532 0.1563 0.1144 3.810 10 0.135 0.1345 0.1382 0.1406 0.1019 3.429 11 0.120 0.1196 0.1233 0.1250 0.0907 3.048 12 0.105 0.1046 0.1084 0.1094 0.0808 2.677 13 0.09 - - 0.094 0.072 2.286 14 0.075 0.0747 0.0785 0.0781 0.0641 1.905 15 0.067 - - 0.07 0.057 1.702 16 0.060 0.0598 0.0635 0.0625 0.0508 1.524 17 0.054 - - 0.056 0.045 1.372 18 0.047 0.0478 0.0516 0.0500 0.0403 1.1938 19 0.042 - - 0.044 0.036 1.067 20 0.036 0.0359 0.0396 0.0375 0.0320 0.9144 21 0.033 - - 0.034 0.028 0.838 22 0.03 - - 0.031 0.025 0.762 23 0.027 - - 0.028 0.023 0.686 24 0.024 - - 0.025 0.02 0.61 25 0.021 - - 0.022 0.018 0.533 26 0.018 - - 0.019 0.017 0.457 27 0.016 - - 0.017 0.014 0.406 28 0.015 - - 0.016 - 0.381 29 0.014 - - 0.014 - 0.356 30 0.012 - - 0.013 - 0.305 31 - - - 0.011 - -
• Thickness is expressed in inches except for the mm column (1in = 25.4mm).
• This table is for reference only and it is highly recommended that you check with a local supplier to establish what actual thickness values are used in your particular location.

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