A conversion for sheet metal guage thickness to Inches and MM.
| Gauge | Inch | MM |
| 0 | 0.324" | 8.230mm |
| 1 | 0.300" | 7.620mm |
| 2 | 0.276" | 7.010mm |
| 3 | 0.252" | 6.401mm |
| 4 | 0.232" | 5.893mm |
| 5 | 0.212" | 5.385mm |
| 6 | 0.192" | 4.877mm |
| 7 | 0.176" | 4.470mm |
| 8 | 0.160" | 4.064mm |
| 9 | 0.144" | 3.658mm |
| 10 | 0.128" | 3.251mm |
| 11 | 0.116" | 2.946mm |
| 12 | 0.104" | 2.642mm |
| 13 | 0.092" | 2.337mm |
| 14 | 0.080" | 2.032mm |
| 15 | 0.072" | 1.829mm |
| 16 | 0.064" | 1.626mm |
| 17 | 0.056" | 1.422mm |
| 18 | 0.048" | 1.219mm |
| 19 | 0.040" | 1.016mm |
| 20 | 0.036" | 0.914mm |
| 21 | 0.032" | 0.813mm |
| 22 | 0.028" | 0.711mm |
| 23 | 0.024" | 0.610mm |
| 25 | 0.020" | 0.508mm |
| 26 | 0.018" | 0.457mm |
| 27 | 0.0164" | 0.4166mm |
| 28 | 0.0148" | 0.3759mm |
| 29 | 0.0136" | 0.3454mm |
| 30 | 0.0124" | 0.3150mm |
| 31 | 0.0116" | 0.2946mm |
| 32 | 0.0108" | 0.2743mm |
| 33 | 0.0100" | 0.2540mm |
| 34 | 0.0092" | 0.2337mm |
| 35 | 0.0084" | 0.2134mm |
| 36 | 0.0076" | 0.1930mm |
| 37 | 0.0068" | 0.1727mm |
| 38 | 0.0060" | 0.1524mm |
| 39 | 0.0052" | 0.1321mm |
| 40 | 0.0048" | 0.1219mm |
Courtesy of www.offroaders.com
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