BWG - Birmingham Wire Gauge
Used to determine wall thickness of pipe - in gauge and decimal parts of inch.
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Birmingham Wire Gauge - BWG - is also known as Stubs' Wire Gauge used for drill rod and tool steel wire.
A cross reference between BWG, imperial sizes and metric equivalents, in terms of tube wall thickness:
| Birmingham Wire Gage BWG | (inches) | (mm) |
|---|---|---|
| 00000 (5/0) | 0.500 | |
| 0000 (4/0) | 0.454 | |
| 000 (3/0) | 0.425 | |
| 00 (2/0) | 0.380 | |
| 0 | 0.340 | 8.636 |
| 1 | 0.300 | 7.620 |
| 2 | 0.284 | 7.214 |
| 3 | 0.259 | 6.579 |
| 4 | 0.238 | 6.045 |
| 5 | 0.220 | 5.588 |
| 6 | 0.203 | 5.156 |
| 7 | 0.180 | 4.572 |
| 8 | 0.165 | 4.191 |
| 9 | 0.148 | 3.759 |
| 10 | 0.134 | 3.404 |
| 11 | 0.120 | 3.048 |
| 12 | 0.109 | 2.769 |
| 13 | 0.095 | 2.413 |
| 14 | 0.083 | 2.108 |
| 15 | 0.072 | 1.829 |
| 16 | 0.065 | 1.651 |
| 17 | 0.058 | 1.473 |
| 18 | 0.049 | 1.245 |
| 19 | 0.042 | 1.067 |
| 20 | 0.035 | 0.889 |
| 21 | 0.032 | 0.813 |
| 22 | 0.028 | 0.711 |
| 23 | 0.025 | 0.635 |
| 24 | 0.022 | 0.559 |
| 25 | 0.020 | 0.508 |
| 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 |
The wall thickness of a pipe is normally given in decimal parts of an inch rather than as a fraction or gauge number. When gauge number is given for a pipe without reference to a system, Birmingham Wire Gauge - BWG - is implied.
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