In sheet metal work, the term "gauge" is frequently employed to specify thickness. Gauges are the units used to indicate the thickness of a metal sheet.
Gauge (Ga.) is a unit of measurement for diameters originating in North America, part of the Browne & Sharpe metering system. Initially utilized in fields like medicine and jewelry, the gauge system operates on an inverse relationship: the higher the number, the thinner the diameter. This system now also denotes thickness.
Ga. measurements differ from inches and lack a direct conversion formula. Even if two materials, like non-ferrous metal and steel, share the same gauge, their actual thicknesses vary.
Refer to the chart below for the conversion between gauge measurements and millimeters/inches for various sheet metal materials.
| Gauge Number | Standard Steel (mm) | Galvanized Steel (mm) | Stainless Steel (mm) | Aluminum, Brass, Copper (mm) |
|---|---|---|---|---|
| 3 | 6.073 | 5.827 | ||
| 4 | 5.095 | 5.954 | 5.189 | |
| 5 | 5.314 | 5.555 | 4.62 | |
| 6 | 4.935 | 5.159 | 4.115 | |
| 7 | 4.554 | 4.763 | 3.665 | |
| 8 | 4.176 | 4.191 | 3.264 | |
| 9 | 3.797 | 3.891 | 3.967 | 2.906 |
| 10 | 3.416 | 3.51 | 3.571 | 2.588 |
| 11 | 3.038 | 3.132 | 3.175 | 2.304 |
| 12 | 2.657 | 2.753 | 2.779 | 2.052 |
| 13 | 2.278 | 2.372 | 2.38 | 1.829 |
| 14 | 1.897 | 1.994 | 1.984 | 1.628 |
| 15 | 1.709 | 1.803 | 1.786 | 1.45 |
| 16 | 1.519 | 1.613 | 1.588 | 1.29 |
| 17 | 1.367 | 1.461 | 1.427 | 1.151 |
| 18 | 1.214 | 1.311 | 1.27 | 1.024 |
| 19 | 1.062 | 1.158 | 1.11 | 0.912 |
| 20 | 0.912 | 1.006 | 0.953 | 0.813 |
| 21 | 0.836 | 0.93 | 0.874 | 0.724 |
| 22 | 0.759 | 0.853 | 0.792 | 0.643 |
| 23 | 0.683 | 0.777 | 0.714 | 0.574 |
| 24 | 0.607 | 0.701 | 0.635 | 0.536 |
| 25 | 0.531 | 0.627 | 0.556 | 0.455 |
| 26 | 0.455 | 0.551 | 0.475 | 0.404 |
| 27 | 0.417 | 0.513 | 0.437 | 0.361 |
| 28 | 0.378 | 0.475 | 0.396 | 0.32 |
| 29 | 0.343 | 0.437 | 0.358 | 0.287 |
| 30 | 0.305 | 0.399 | 0.318 | 0.254 |
| 31 | 0.267 | 0.361 | 0.277 | 0.226 |
| 32 | 0.246 | 0.34 | 0.259 | 0.203 |
| 33 | 0.229 | 0.239 | 0.18 | |
| 34 | 0.208 | 0.218 | 0.16 | |
| 35 | 0.191 | 0.198 | 0.142 | |
| 36 | 0.17 | 0.178 | 0.127 | |
| 37 | 0.163 | 0.168 | 0.113 | |
| 38 | 0.17 | 0.157 | 0.101 |
| Gauge Number | Standard Steel (in) | Galvanized Steel (in) | Stainless Steel (in) | Aluminum, Brass, Copper (in) |
|---|---|---|---|---|
| 3 | 0.2391 | 0.2294 | ||
| 4 | 0.2242 | 0.2344 | 0.2043 | |
| 5 | 0.2092 | 0.2187 | 0.1819 | |
| 6 | 0.1943 | 0.2031 | 0.162 | |
| 7 | 0.1793 | 0.1875 | 0.1443 | |
| 8 | 0.1644 | 0.165 | 0.1285 | |
| 9 | 0.1495 | 0.1532 | 0.1562 | 0.1144 |
| 10 | 0.1345 | 0.1382 | 0.1406 | 0.1019 |
| 11 | 0.1196 | 0.1233 | 0.125 | 0.0907 |
| 12 | 0.1046 | 0.1084 | 0.1094 | 0.0808 |
| 13 | 0.0897 | 0.0934 | 0.0937 | 0.072 |
| 14 | 0.0747 | 0.0785 | 0.0781 | 0.0641 |
| 15 | 0.0673 | 0.071 | 0.0703 | 0.0571 |
| 16 | 0.0598 | 0.0635 | 0.0625 | 0.0508 |
| 17 | 0.0538 | 0.0575 | 0.0562 | 0.0453 |
| 18 | 0.0478 | 0.0516 | 0.05 | 0.0403 |
| 19 | 0.0418 | 0.0456 | 0.0437 | 0.0359 |
| 20 | 0.0359 | 0.0396 | 0.0375 | 0.032 |
| 21 | 0.0329 | 0.0366 | 0.0344 | 0.0285 |
| 22 | 0.0299 | 0.0336 | 0.0312 | 0.0253 |
| 23 | 0.0269 | 0.0306 | 0.0281 | 0.0226 |
| 24 | 0.0239 | 0.0276 | 0.025 | 0.0211 |
| 25 | 0.0209 | 0.0247 | 0.0219 | 0.0179 |
| 26 | 0.0179 | 0.0217 | 0.0187 | 0.0159 |
| 27 | 0.0164 | 0.0202 | 0.0172 | 0.0142 |
| 28 | 0.0149 | 0.0187 | 0.0156 | 0.0126 |
| 29 | 0.0135 | 0.0172 | 0.0141 | 0.0113 |
| 30 | 0.012 | 0.0157 | 0.0125 | 0.01 |
| 31 | 0.0105 | 0.0142 | 0.0109 | 0.0089 |
| 32 | 0.0097 | 0.0134 | 0.0102 | 0.008 |
| 33 | 0.009 | 0.0094 | 0.0071 | |
| 34 | 0.0082 | 0.0086 | 0.0063 | |
| 35 | 0.0075 | 0.0078 | 0.0056 | |
| 36 | 0.0067 | 0.007 | 0.005 | |
| 37 | 0.0064 | 0.0066 | 0.00445 | |
| 38 | 0.0067 | 0.0062 | 0.00396 |
The above is the sheet metal specification and thickness table. If you require sheet metal machining services, feel free to reach out to Richconn. We specialize in sheet metal processing and can assist with your specific needs.
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