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Wire Gauge Table - Metric Sizes
The first column gives the Gauge Number and the other columns give the exact size in mm for the particular standard.
Gauge No  SWG    AWG    Stubbs  Birmingham Sheet MetalWashburn & MeonUS SheetS & W Music WireBirmingham Stubbs Iron
7/012.7000  16.931612.4460   
6/011.7856  15.875011.722111.90500.1016 
5/010.9728  14.942810.934711.11250.1270 
4/010.160011.6840 13.756610.002510.31750.152411.7856
3/09.448810.4038 12.70009.20759.52500.177810.7950
2/08.83929.2659 11.30818.40748.73000.20329.6520
08.22968.2525 10.06867.78517.93750.22868.6360
17.62007.34825.76588.97137.18827.15010.25407.6200
27.01046.54305.56267.99346.66756.74620.27947.2136
36.40085.82685.38487.12226.19006.35000.30486.5786
45.89285.18925.25786.35005.72265.95380.33026.0452
55.38484.62035.18165.65155.25785.55500.35565.5880
64.87684.11485.10545.03174.87685.15870.40645.1562
74.47043.66525.05464.48064.49584.76250.45724.5720
84.06403.26395.00383.98784.11484.36630.50804.1910
93.65762.95664.92763.55093.76683.96750.55883.7592
103.25122.58834.85143.17503.42903.57120.60963.4036
112.94642.30384.77522.82703.06073.17500.66043.0480
122.64162.05234.69902.51712.67972.77880.73662.7686
132.33681.82884.62282.24032.32412.38000.78742.4130
142.03201.62814.57201.99392.03201.98370.83822.1082
151.82881.45034.52121.77551.82881.78560.88901.8288
161.62561.29034.44501.58751.58751.58750.93981.6510
171.42241.15064.36881.41221.37161.42750.99061.4732
181.21921.02364.26721.25731.20651.27001.04141.2446
191.01600.91194.16561.11761.04141.11001.09221.0668
200.91440.81284.08940.99570.88390.95251.14300.8890
210.81280.72393.98780.88650.80520.87381.19380.8128
220.71120.64263.93700.79250.72640.79251.24460.7112
230.60960.57403.88620.70610.65530.71371.29540.6350
240.55880.51053.83540.62990.58420.63501.39700.5588
250.50800.45473.75920.55880.51820.55631.49860.5080
260.45720.40393.70840.49780.45970.47501.60020.4572
270.41660.36073.63220.44200.43940.43691.70180.4064
280.37590.32003.53060.39620.41150.39621.80340.3556
290.34540.28703.40360.35310.38100.35811.90500.3302
300.31500.25403.22580.31240.35560.31752.03200.3048
310.29460.22613.04800.27940.33530.27692.15900.2540
320.27430.20072.92100.24890.32510.25912.28600.2286
330.25400.18032.84480.22100.29970.23882.41300.2032
340.23370.16002.79400.19560.26420.21842.54000.1778
350.21340.14222.76860.17530.24130.19812.69240.1524
360.19300.12702.69240.15490.22860.17782.84480.1016
370.17270.11432.61620.13720.21590.16762.9972 
380.15240.10162.56540.12190.20320.15753.1496 
390.13210.08892.51460.10920.1905 3.3020 
400.12190.07872.46380.09910.1778 0.9652 
410.1118 2.41300.0864  3.7084 
420.1016 2.33680.0787  3.9116 
430.0914 2.23520.0686  4.1148 
440.0813 2.15900.0610  4.3180 
450.0711 2.05740.0533  4.5720 
460.0610 2.00660.0483    
470.0508 1.95580.0432    
480.0406 1.90500.0381    
490.0305 1.82880.0330    
500.0254 1.75260.0305