Sheet metal gauge (or gage) numbers refer to the thickness of sheet metal. This thickness is measured in either mm or in thousandths of an inch (in). The higher the gauge, the thinner the sheet metal (except for Zinc).
The gauge size for each type of material differs and is determined by weight.
Common Sheet Metal Gauge Standards
Manufacturers’ Standard Gage – for standard steel, galvanized steel, and stainless steel
The American Wire Gage (AWG) or Brown and Sharpe Gage – for non-ferrous metals, such as aluminum and brass.
Birmingham Gage (BG) – for a variety of metals
Standard Gauge for Zinc
The following charts shows the various gauge sizes of the common engineering materials, and their measurements in metric and imperial.
You might also want to see our Sheet Metal Gauge Calculator (mm to Gauge).
Sheet Metal Gauge Chart (Metric - mm)
| Gauge # | Standard Steel | Galvanized Steel | Stainless Steel | Aluminum | Birmingham Gage | Zinc |
|---|---|---|---|---|---|---|
| 0000000 | - | - | 12.700 | - | 16.932 | - |
| 000000 | - | - | 11.902 | 14.732 | 15.875 | - |
| 00000 | - | - | 11.113 | 13.119 | 14.943 | - |
| 0000 | - | - | 10.320 | 11.684 | 13.757 | - |
| 000 | - | - | 9.525 | 10.404 | 12.700 | - |
| 00 | - | - | 8.733 | 9.266 | 11.308 | - |
| 0 | - | - | 7.938 | 8.252 | 10.069 | - |
| 1 | - | - | 7.145 | 7.348 | 8.971 | 0.051 |
| 2 | - | - | 6.746 | 6.543 | 7.993 | 0.102 |
| 3 | 6.073 | - | 6.350 | 5.827 | 7.122 | 0.152 |
| 4 | 5.695 | - | 5.954 | 5.189 | 6.35 | 0.203 |
| 5 | 5.314 | - | 5.555 | 4.620 | 5.652 | 0.254 |
| 6 | 4.935 | - | 5.159 | 4.115 | 5.032 | 0.305 |
| 7 | 4.554 | - | 4.763 | 3.665 | 4.481 | 0.356 |
| 8 | 4.176 | 4.270 | 4.366 | 3.264 | 3.988 | 0.406 |
| 9 | 3.797 | 3.891 | 3.967 | 2.906 | 3.551 | 0.457 |
| 10 | 3.416 | 3.510 | 3.571 | 2.588 | 3.175 | 0.508 |
| 11 | 3.038 | 3.132 | 3.175 | 2.304 | 2.827 | 0.610 |
| 12 | 2.657 | 2.753 | 2.779 | 2.052 | 2.517 | 0.711 |
| 13 | 2.278 | 2.372 | 2.380 | 1.829 | 2.24 | 0.813 |
| 14 | 1.897 | 1.994 | 1.984 | 1.628 | 1.994 | 0.914 |
| 15 | 1.709 | 1.803 | 1.786 | 1.450 | 1.775 | 1.016 |
| 16 | 1.519 | 1.613 | 1.588 | 1.290 | 1.588 | 1.143 |
| 17 | 1.367 | 1.461 | 1.427 | 1.151 | 1.412 | 1.270 |
| 18 | 1.214 | 1.311 | 1.270 | 1.024 | 1.257 | 1.397 |
| 19 | 1.062 | 1.158 | 1.110 | 0.912 | 1.118 | 1.524 |
| 20 | 0.912 | 1.006 | 0.953 | 0.813 | 0.996 | 1.778 |
| 21 | 0.836 | 0.930 | 0.874 | 0.724 | 0.886 | 2.032 |
| 22 | 0.759 | 0.853 | 0.792 | 0.643 | 0.792 | 2.286 |
| 23 | 0.683 | 0.777 | 0.714 | 0.574 | 0.706 | 2.540 |
| 24 | 0.607 | 0.701 | 0.635 | 0.511 | 0.627 | 3.175 |
| 25 | 0.531 | 0.627 | 0.556 | 0.455 | 0.559 | 6.350 |
| 26 | 0.455 | 0.551 | 0.475 | 0.404 | 0.498 | 9.525 |
| 27 | 0.417 | 0.513 | 0.437 | 0.361 | 0.442 | 12.700 |
| 28 | 0.378 | 0.475 | 0.396 | 0.320 | 0.396 | 25.400 |
| 29 | 0.343 | 0.437 | 0.358 | 0.287 | 0.353 | - |
| 30 | 0.305 | 0.399 | 0.318 | 0.254 | 0.312 | - |
| 31 | 0.267 | 0.361 | 0.277 | 0.226 | 0.279 | - |
| 32 | 0.246 | 0.340 | 0.259 | 0.203 | 0.249 | - |
| 33 | 0.229 | - | 0.239 | 0.180 | 0.221 | - |
| 34 | 0.208 | - | 0.218 | 0.160 | 0.196 | - |
| 35 | 0.191 | - | 0.198 | 0.142 | 0.175 | - |
| 36 | 0.170 | - | 0.178 | 0.127 | 0.155 | - |
| 37 | 0.163 | - | 0.168 | 0.114 | 0.137 | - |
| 38 | 0.152 | - | 0.157 | 0.102 | 0.122 | - |
| 39 | - | - | - | 0.089 | 0.109 | - |
| 40 | - | - | - | 0.079 | 0.097 | - |
| 41 | - | - | - | - | 0.086 | - |
| 42 | - | - | - | - | 0.076 | - |
| 43 | - | - | - | - | 0.069 | - |
| 44 | - | - | - | - | 0.061 | - |
| 45 | - | - | - | - | 0.053 | - |
| 46 | - | - | - | - | 0.048 | - |
| 47 | - | - | - | - | 0.043 | - |
| 48 | - | - | - | - | 0.041 | - |
| 49 | - | - | - | - | 0.033 | - |
| 50 | - | - | - | - | 0.030 | - |
| 51 | - | - | - | - | 0.027 | - |
| 52 | - | - | - | - | 0.024 | - |
Alan B.
Mechanical Engineer
"Hands-Down the Best Platform and Partner for Fast, Quality Parts"
I am continually impressed not just by the parts we have received but the incredible level of support. Our team has received 100s of parts, all at an incredible price. Because you have a direct line of communication with the teams making the parts, there is an added level of ownership that you don’t see with other platforms. We are actively switching to have more parts made on Jiga to further drive down costs and have reliable delivery dates.
Jiga is the best way to get the parts you need, when you need them.
You might also want to see our Sheet Metal Gauge Calculator (inch to Gauge).
Sheet Metal Gauge Chart (Imperial - inch)
| Gauge # | Standard Steel | Galvanized Steel | Stainless Steel | Aluminum | Birmingham Gage | Zinc |
|---|---|---|---|---|---|---|
| 0000000 | - | - | 0.5000 | - | 0.6666 | - |
| 000000 | - | - | 0.4686 | 0.5800 | 0.6250 | - |
| 00000 | - | - | 0.4375 | 0.5165 | 0.5883 | - |
| 0000 | - | - | 0.4063 | 0.4600 | 0.5416 | - |
| 000 | - | - | 0.3750 | 0.4096 | 0.5000 | - |
| 00 | - | - | 0.3438 | 0.3648 | 0.4452 | - |
| 0 | - | - | 0.3125 | 0.3249 | 0.3964 | - |
| 1 | - | - | 0.2813 | 0.2893 | 0.3532 | 0.0020 |
| 2 | - | - | 0.2656 | 0.2576 | 0.3147 | 0.0040 |
| 3 | 0.2391 | - | 0.2500 | 0.2294 | 0.2804 | 0.0060 |
| 4 | 0.2242 | - | 0.2344 | 0.2043 | 0.2500 | 0.0080 |
| 5 | 0.2092 | - | 0.2187 | 0.1819 | 0.2225 | 0.0100 |
| 6 | 0.1943 | - | 0.2031 | 0.1620 | 0.1981 | 0.0120 |
| 7 | 0.1793 | - | 0.1875 | 0.1443 | 0.1764 | 0.0140 |
| 8 | 0.1644 | 0.1681 | 0.1719 | 0.1285 | 0.1570 | 0.0160 |
| 9 | 0.1495 | 0.1532 | 0.1562 | 0.1144 | 0.1398 | 0.0180 |
| 10 | 0.1345 | 0.1382 | 0.1406 | 0.1019 | 0.1250 | 0.0200 |
| 11 | 0.1196 | 0.1233 | 0.1250 | 0.0907 | 0.1113 | 0.0240 |
| 12 | 0.1046 | 0.1084 | 0.1094 | 0.0808 | 0.0991 | 0.0280 |
| 13 | 0.0897 | 0.0934 | 0.0937 | 0.0720 | 0.0882 | 0.0320 |
| 14 | 0.0747 | 0.0785 | 0.0781 | 0.0641 | 0.0785 | 0.0360 |
| 15 | 0.0673 | 0.0710 | 0.0703 | 0.0571 | 0.0699 | 0.0400 |
| 16 | 0.0598 | 0.0635 | 0.0625 | 0.0508 | 0.0625 | 0.0450 |
| 17 | 0.0538 | 0.0575 | 0.0562 | 0.0453 | 0.0556 | 0.0500 |
| 18 | 0.0478 | 0.0516 | 0.0500 | 0.0403 | 0.0495 | 0.0550 |
| 19 | 0.0418 | 0.0456 | 0.0437 | 0.0359 | 0.0440 | 0.0600 |
| 20 | 0.0359 | 0.0396 | 0.0375 | 0.0320 | 0.0392 | 0.0700 |
| 21 | 0.0329 | 0.0366 | 0.0344 | 0.0285 | 0.0349 | 0.0800 |
| 22 | 0.0299 | 0.0336 | 0.0312 | 0.0253 | 0.0312 | 0.0900 |
| 23 | 0.0269 | 0.0306 | 0.0281 | 0.0226 | 0.0278 | 0.1000 |
| 24 | 0.0239 | 0.0276 | 0.0250 | 0.0201 | 0.0247 | 0.1250 |
| 25 | 0.0209 | 0.0247 | 0.0219 | 0.0179 | 0.0220 | 0.2500 |
| 26 | 0.0179 | 0.0217 | 0.0187 | 0.0159 | 0.0196 | 0.3750 |
| 27 | 0.0164 | 0.0202 | 0.0172 | 0.0142 | 0.0174 | 0.5000 |
| 28 | 0.0149 | 0.0187 | 0.0156 | 0.0126 | 0.0156 | 1.0000 |
| 29 | 0.0135 | 0.0172 | 0.0141 | 0.0113 | 0.0139 | - |
| 30 | 0.0120 | 0.0157 | 0.0125 | 0.0100 | 0.0123 | - |
| 31 | 0.0105 | 0.0142 | 0.0109 | 0.0089 | 0.0110 | - |
| 32 | 0.0097 | 0.0134 | 0.0102 | 0.0080 | 0.0098 | - |
| 33 | 0.0090 | - | 0.0094 | 0.0071 | 0.0087 | - |
| 34 | 0.0082 | - | 0.0086 | 0.0063 | 0.0077 | - |
| 35 | 0.0075 | - | 0.0078 | 0.0056 | 0.0069 | - |
| 36 | 0.0067 | - | 0.0070 | 0.0050 | 0.0061 | - |
| 37 | 0.0064 | - | 0.0066 | 0.0045 | 0.0054 | - |
| 38 | 0.0060 | - | 0.0062 | 0.0040 | 0.0048 | - |
| 39 | - | - | - | 0.0035 | 0.0043 | - |
| 40 | - | - | - | 0.0031 | 0.0038 | - |
| 41 | - | - | - | - | 0.0034 | - |
| 42 | - | - | - | - | 0.0030 | - |
| 43 | - | - | - | - | 0.0027 | - |
| 44 | - | - | - | - | 0.0024 | - |
| 45 | - | - | - | - | 0.0021 | - |
| 46 | - | - | - | - | 0.0019 | - |
| 47 | - | - | - | - | 0.0017 | - |
| 48 | - | - | - | - | 0.0016 | - |
| 49 | - | - | - | - | 0.0013 | - |
| 50 | - | - | - | - | 0.0012 | - |
| 51 | - | - | - | - | 0.0011 | - |
| 52 | - | - | - | - | 0.0010 | - |
