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Engineering ToolBox > B.W.G. - Birmingham Wire Gauge
Wall thickness of a pipe is normally given in decimal part of an inch rather than as fraction or gage number. When gauge numbers is given for a pipe without reference to a system, Birmingham Wire Gauge - BWG - is implied.
Birmingham Wire Gauge is also known as Stubs' Wire Gauge, used for drill rod and tool steel wire.
| Gauge | Birmingham Wire Gage B.W.G. (inches) |
| 00000 (5/0) | 0.500 |
| 0000 (4/0) | 0.454 |
| 000 (3/0) | 0.425 |
| 00 (2/0) | 0.380 |
| 0 | 0.340 |
| 1 | 0.300 |
| 2 | 0.284 |
| 3 | 0.259 |
| 4 | 0.238 |
| 5 | 0.220 |
| 6 | 0.203 |
| 7 | 0.180 |
| 8 | 0.165 |
| 9 | 0.148 |
| 10 | 0.134 |
| 11 | 0.120 |
| 12 | 0.109 |
| 13 | 0.095 |
| 14 | 0.083 |
| 15 | 0.072 |
| 16 | 0.065 |
| 17 | 0.058 |
| 18 | 0.049 |
| 19 | 0.042 |
| 20 | 0.035 |
| 21 | 0.032 |
| 22 | 0.028 |
| 23 | 0.025 |
| 24 | 0.022 |
| 25 | 0.020 |
| 26 | 0.018 |
| 27 | 0.016 |
| 28 | 0.014 |
| 29 | 0.013 |
| 30 | 0.012 |
| 31 | 0.010 |
| 32 | 0.009 |
| 33 | 0.008 |
| 34 | 0.007 |
| 35 | 0.005 |
| 36 | 0.004 |