The word “gauge” is frequently used while working with sheet metal. The meaning of 18 gauge steel, for instance, may not be clear to someone who is not familiar with the gauge system. This blog includes a sheet metal gauge chart and an explanation of the gauge system as a resource.
How are Sheet Metal Gauges Used?
Gauges are used to specify a sheet metal’s thickness. The values of gauges are not reliant on either the metric or the standard measuring systems. The true thickness of sheet metal can be calculated in inches or millimeters using a gauge conversion chart. According to a gauge conversion chart, 18 gauge steel, for instance, equals 0.0478 inches or 1.214 millimeters. The gauge number “18” has no bearing on the measures themselves.
Various gauge systems are in use today, with particular gauge designations being used for particular metal kinds. For instance, under one gauge system, 18 gauge steel has a thickness of 0.0478 inches while 18 gauge aluminum has a thickness of 0.0403. A gauge chart should be used to make sure the metal fulfills the necessary dimensions because of the different thicknesses.
History of the Gauge System
Metal fabrication has a long history with the gauge system. Prior to the widespread adoption of standard and metric measurement systems, it most likely came from the British wire business. The diameter of the metal wire being pulled at the time was specified using gauges. Since that time, it has continued to be a common way to indicate the thickness of wire and sheet metal.
Sheet Metal Gauge Charts
Use these sheet metal gauge charts to determine the metal gauge you require:
Jump to:
Mild Steel Gauge Chart
Aluminum Gauge Chart
Stainless Steel Gauge Chart
Galvanized Steel Gauge Chart
Brass Gauge Chart
Copper Gauge Chart
| Mild Steel Gauge Chart* | ||
| GaugeNumber | Inches | MM |
| 7 | .1793 | 4.554 |
| 8 | .1644 | 4.175 |
| 9 | .1495 | 3.797 |
| 10 | .1345 | 3.416 |
| 11 | .1196 | 3.038 |
| 12 | .1046 | 2.656 |
| 14 | .0747 | 1.897 |
| 16 | .0598 | 1.518 |
| 18 | .0478 | 1.214 |
| 20 | .0359 | .911 |
| 22 | .0299 | .759 |
| 24 | .0239 | .607 |
| 26 | .0179 | .454 |
| 28 | .0149 | .378 |
Buy Mild Steel
| Aluminum Gauge Chart* | ||
| GaugeNumber | Inches | MM |
| 7 | .1443 | 3.665 |
| 8 | .1285 | 3.264 |
| 9 | .1144 | 2.906 |
| 10 | .1019 | 2.588 |
| 11 | .09074 | 2.305 |
| 12 | .08081 | 2.053 |
| 14 | .06408 | 1.628 |
| 16 | .05082 | 1.291 |
| 18 | .04030 | 1.024 |
| 20 | .03196 | .812 |
| 22 | .02535 | .644 |
| 24 | .02010 | .511 |
| 26 | .01594 | .405 |
| 28 | .01264 | .321 |
| 30 | .01003 | .255 |
Buy Aluminum
| Stainless Steel Gauge Chart* | ||
| GaugeNumber | Inches | MM |
| 8 | .17187 | 4.365 |
| 9 | .15625 | 3.968 |
| 10 | .14062 | 3.571 |
| 11 | .125 | 3.175 |
| 12 | .10937 | 2.778 |
| 14 | .07812 | 1.984 |
| 16 | .0625 | 1.587 |
| 18 | .050 | 1.270 |
| 20 | .0375 | .9525 |
| 22 | .03125 | .7937 |
| 24 | .025 | .635 |
| 26 | .01875 | .476 |
| 28 | .01562 | .396 |
| 30 | .0125 | .3175 |
Buy Stainless Steel
| Galvanized Steel Gauge Chart* | ||
| GaugeNumber | Inches | MM |
| 8 | .1681 | 4.269 |
| 9 | .1532 | 3.891 |
| 10 | .1382 | 3.510 |
| 11 | .1233 | 3.1318 |
| 12 | .1084 | 2.753 |
| 14 | .0785 | 1.9939 |
| 16 | .0635 | 1.6129 |
| 18 | .0516 | 1.310 |
| 20 | .0396 | 1.005 |
| 22 | .0336 | .853 |
| 24 | .0276 | .701 |
| 26 | .0217 | .551 |
| 28 | .0187 | .474 |
| 30 | .0157 | .398 |
Buy Galvanized Steel
| Brass Gauge Chart* | ||
| GaugeNumber | Inches | MM |
| 7 | .1443 | 3.665 |
| 8 | .1285 | 3.264 |
| 9 | .1144 | 2.906 |
| 10 | .1019 | 2.588 |
| 11 | .09074 | 2.305 |
| 12 | .08081 | 2.053 |
| 14 | .06408 | 1.628 |
| 16 | .05082 | 1.291 |
| 18 | .04030 | 1.024 |
| 20 | .03196 | .812 |
| 22 | .02535 | .644 |
| 24 | .02010 | .511 |
| 26 | .01594 | .405 |
| 28 | .01264 | .321 |
| 30 | .01003 | .255 |
Buy Brass
| Copper Gauge Chart* | ||
| GaugeNumber | Inches | MM |
| 7 | .180 | 4.572 |
| 8 | .165 | 4.191 |
| 9 | .148 | 3.759 |
| 10 | .134 | 3.404 |
| 11 | .120 | 3.048 |
| 12 | .109 | 2.769 |
| 14 | .083 | 2.108 |
| 16 | .065 | 1.651 |
| 18 | .049 | 1.245 |
| 20 | .035 | .889 |
| 22 | .028 | .711 |
| 24 | .022 | .559 |
| 26 | .018 | .457 |
| 28 | .014 | .356 |
| 30 | .012 | .305 |
Buy Copper
Read More :
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