Standard wire gauge
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British standard wire gauge is a set of wire sizes given by BS 3737:1964, and is generally abbreviated to SWG. Use of SWG sizes has fallen greatly in popularity, but is still in use. Cross sectional area in square millimetres is now a more popular size measurement.
A table of commonly used wire gauges and diameters is shown below
| SWG | mm | in |
|---|---|---|
| 12 | 2.642 | 0.104 |
| 14 | 2.032 | 0.080 |
| 16 | 1.626 | 0.064 |
| 18 | 1.219 | 0.048 |
| 20 | 0.914 | 0.036 |
| 22 | 0.711 | 0.028 |
| 24 | 0.559 | 0.022 |
| 26 | 0.457 | 0.018 |
| 28 | 0.376 | 0.014800 |
| 30 | 0.315 | 0.012400 |
| 32 | 0.274 | 0.010800 |
| 34 | 0.234 | 0.009200 |
| 36 | 0.193 | 0.007600 |
| 38 | 0.152 | 0.006000 |
| 40 | 0.122 | 0.004800 |
| 42 | 0.102 | 0.004000 |
| 44 | 0.0813 | 0.003200 |
| 46 | 0.0610 | 0.002400 |
| 48 | 0.0406 | 0.001600 |
| 50 | 0.0254 | 0.001000 |