Birmingham Wire Gauge (BWG) table

Birmingham Wire Gauge (BWG), also know as Stubbs Iron Wire Gauge (SWG, which, of course, is different from Stubbs Steel Wire Gauge) was used to specify copper wire sizes in Great Britain. It is not the same as the American Wire Gauge (AWG) used in the US. I’ve included it here for those trying to interpret older British antenna articles (and possibly those from Australia, New Zealand, South Africa, or other parts of the Commonwealth.)

Note that the larger sizes would be specified verbally as “Five ought”.

BWG
gauge
diameter
(inches)
diameter
(mm)
00000 or 5/00.50012.7
0000 or 4/00.45411.532
000 or 3/00.42510.795
00 or 2/00.3809.652
00.3408.638
10.3007.620
20.2847.214
30.2596.579
40.2386.045
50.2205.588
60.2035.156
70.1804.572
80.1654.191
90.1483.759
100.1343.404
110.1203.048
120.1092.769
130.0952.413
140.0832.108
150.0721.829
160.0651.651
170.0581.473
180.0491.245
190.0421.067
200.0350.889
210.0320.813
220.0280.711
230.0250.635
240.0220.559
250.0200.508
260.0180.457
270.0160.406
280.0140.356
290.0130.330
300.0120.305
310.0100,254
320.0090.229
Birmingham Wire Gauge (BWG) or Stubbs Iron Wire Gauge (SWG) sizes.