Ga. is the abbreviation of GAUGE, a diameter and length measurement unit that originated in North America. Originally used in medicine and jewelry, the larger the number, the smaller the diameter, and later popularized to indicate “thickness“.
gauge measurement tool
Since the Ga. base and inches are different, there is no conversion formula, and the units are compared in the following table：
| Gauge (Ga.) | Standard Steel Thickness (inches) | Galvanized Steel Thickness (inches) | Aluminum Thickness (inches) | Standard steel thickness (mm) | Galvanized steel thickness (mm) | Aluminum Thickness(mm) |
| 3 | 0.2391 | 0.2294 | 6.07314 | 5.82676 | ||
| 4 | 0.2242 | 0.2043 | 5.69468 | 5.18922 | ||
| 5 | 0.2092 | 0.1819 | 5.31368 | 4.62026 | ||
| 6 | 0.1943 | 0.162 | 4.93522 | 4.1148 | ||
| 7 | 0.1793 | 0.1443 | 4.55422 | 3.66522 | ||
| 8 | 0.1644 | 0.1285 | 4.17576 | 3.2639 | ||
| 9 | 0.1495 | 0.1532 | 0.1144 | 3.7973 | 3.89128 | 2.90576 |
| 10 | 0.1345 | 0.1382 | 0.1019 | 3.4163 | 3.51028 | 2.58826 |
| 11 | 0.1196 | 0.1233 | 0.0907 | 3.03784 | 3.13182 | 2.30378 |
| 12 | 0.1046 | 0.1084 | 0.0808 | 2.65684 | 2.75336 | 2.05232 |
| 13 | 0.0897 | 0.0934 | 0.072 | 2.27838 | 2.37236 | 1.8288 |
| 14 | 0.0747 | 0.0785 | 0.0641 | 1.89738 | 1.9939 | 1.62814 |
| 15 | 0.0673 | 0.071 | 0.0571 | 1.70942 | 1.8034 | 1.45034 |
| 16 | 0.0598 | 0.0635 | 0.0508 | 1.51892 | 1.6129 | 1.29032 |
| 17 | 0.0538 | 0.0575 | 0.0453 | 1.36652 | 1.4605 | 1.15062 |
| 18 | 0.0478 | 0.0516 | 0.0403 | 1.21412 | 1.31064 | 1.02362 |
| 19 | 0.0418 | 0.0456 | 0.0359 | 1.06172 | 1.15824 | 0.91186 |
| 20 | 0.0359 | 0.0396 | 0.032 | 0.91186 | 1.00584 | 0.8128 |
| 21 | 0.0329 | 0.0366 | 0.0285 | 0.83566 | 0.92964 | 0.7239 |
| 22 | 0.0299 | 0.0336 | 0.0253 | 0.75946 | 0.85344 | 0.64262 |
| 23 | 0.0269 | 0.0306 | 0.0226 | 0.68326 | 0.77724 | 0.57404 |
| 24 | 0.0239 | 0.0276 | 0.0201 | 0.60706 | 0.7004 | 0.51054 |
| 25 | 0.0209 | 0.0247 | 0.0179 | 0.53086 | 0.62738 | 0.45466 |
| 26 | 0.0179 | 0.0217 | 0.0159 | 0.45466 | 0.55118 | 0.40386 |
| 27 | 0.0164 | 0.0202 | 0.0142 | 0.41656 | 0.51308 | 0.36068 |
| 28 | 0.0149 | 0.0187 | 0.0126 | 0.37846 | 0.47498 | 0.32004 |
| 29 | 0.0135 | 0.0172 | 0.0113 | 0.3429 | 0.43688 | 0.28702 |
| 30 | 0.012 | 0.0157 | 0.01 | 0.3048 | 0.39878 | 0.254 |
| 31 | 0.0105 | 0.0142 | 0.0089 | 0.2667 | 0.36068 | 0.22606 |
| 32 | 0.0097 | 0.0134 | 0.008 | 0.24638 | 0.34036 | 0.2032 |
| 33 | 0.009 | 0.0071 | 0.2286 | 0.18034 | ||
| 34 | 0.0082 | 0.0063 | 0.20828 | 0.16002 | ||
| 35 | 0.0075 | 0.0056 | 0.1905 | 0.14224 | ||
| 36 | 0.0067 | 0.17018 |
Gauge of different thickness：
6 gauge thickness aluminum
8 gauge thickness aluminum
10 gauge thickness aluminum
12 gauge thickness aluminum
14 gauge thickness aluminum
16 gauge thickness aluminum
18 gauge thickness aluminum
20 gauge thickness aluminum
22 gauge thickness aluminum
24 gauge thickness aluminum
26 gauge thickness aluminum
28 gauge thickness aluminum
Aluminum VS Steel
1. Different weight
The most intuitive difference between aluminum and steel is that the difference in density is very obvious. If you weigh it by hand (assuming you are as big as your head, you can pick it up), the heavy one is steel, and the light one is aluminum, which can generally be distinguished.
2. Different surfaces
Aluminum will not rust in the air, but will oxidize naturally, and the color is silvery white or dark gray; the natural surface of steel will turn black or rust. Note, though, that steel will be very shiny if sheetd.
3. Different hardness
Steel is very hard, harder than most objects in nature. Aluminum is much less hard than steel, so scratch each other with your hands to see which is harder.
Aluminum VS Steel
4. Different magnetic properties
Most steel devices are attracted to magnets, while aluminum is almost non-magnetic.
5. The resistor layout is different.
Measure the resistivity of both materials with a multimeter. Generally speaking, the resistivity of aluminum is the lowest among various metal materials, and its conductivity is higher than that of steel.
6. Different melting points
Aluminum has a very low melting point. Both materials are heated in the same melting furnace, with the aluminum melting first.