BWG and SWG are alternative measurements for steel tubing sizes (OD & wall thickness). Each BWG number represents a specific steel tubing thickness, which can be converted in inches or mm. SWG (Standard Wire Gauge (SWG) is an alternate way to indicate steel tubing’s wall thickness. Calculate specific sizing by using the two drop down menus above the chart.
TABLE TO DETERMINE NOMINAL TUBE ID’S – BIRMINGHAM WIRE GAUGE (BWG) | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Wall thickness | Tube OD (in/mm) | ||||||||||||||
BWG | Decimal in/mm | 3/8 | 1/2 | 5/8 | 3/4 | 7/8 | 1 | 1 1/8 | 1 1/4 | 1 3/8 | 1 1/2 | 1 5/8 | 1 3/4 | 2 | 2 1/2 |
9.53 | 12.70 | 15.88 | 19.05 | 22.23 | 25.40 | 28.58 | 31.75 | 34.93 | 38.10 | 41.28 | 44.45 | 50.80 | 63.50 | ||
8 | 0.165″ | 0.045″ | 0.170″ | 0.295″ | 0.420″ | 0.545″ | 0.670″ | 0.795″ | 0.920″ | 1.045″ | 1.170″ | 1.295″ | 1.420″ | 1.670″ | 2.170″ |
4.190 | 1.14 | 4.32 | 7.49 | 10.67 | 13.84 | 17.02 | 20.19 | 23.37 | 26.54 | 29.72 | 32.89 | 36.07 | 42.42 | 55.12 | |
9 | 0.148″ | 0.079″ | 0.204″ | 0.329″ | 0.454″ | 0.579″ | 0.704″ | 0.829″ | 0.954″ | 10.79″ | 1.204″ | 1.329″ | 1.454″ | 1.704″ | 2.204″ |
3.760 | 2.01 | 5.18 | 8.36 | 11.53 | 14.71 | 17.88 | 21.06 | 24.23 | 27.41 | 30.58 | 33.76 | 36.93 | 43.28 | 55.98 | |
10 | 0.134″ | 0.107″ | 0.232″ | 0.357″ | 0.482″ | 0.607″ | 0.732″ | 0.857″ | 0.982″ | 1.107″ | 1.232″ | 1.357″ | 1.482″ | 1.732″ | 2.232″ |
3.400 | 2.72 | 5.89 | 9.07 | 12.24 | 15.42 | 18.59 | 21.77 | 24.94 | 28.12 | 31.29 | 34.47 | 37.64 | 43.99 | 56.69 | |
11 | 0.120″ | 0.135″ | 0.260″ | 0.385″ | 0.510″ | 0.635″ | 0.760″ | 0.885″ | 1.010″ | 1.135″ | 1.260″ | 1.385″ | 1.510″ | 1.760″ | 2.260″ |
3.050 | 3.43 | 6.60 | 9.78 | 12.95 | 16.13 | 19.30 | 22.48 | 25.65 | 28.83 | 32.00 | 35.18 | 38.35 | 44.70 | 57.40 | |
12 | 0.109″ | 0.157″ | 0.282″ | 0.407″ | 0.532″ | 0.657″ | 0.782″ | 0.907″ | 1.032″ | 1.157″ | 1.282″ | 1.407″ | 1.532″ | 1.782″ | 2.282″ |
2.770 | 3.99 | 7.16 | 10.34 | 13.51 | 16.69 | 19.86 | 23.04 | 26.21 | 29.39 | 32.56 | 35.74 | 38.91 | 45.26 | 57.96 | |
13 | 0.095″ | 0.185″ | 0.310″ | 0.435″ | 0.560″ | 0.685″ | 0.810″ | 0.935″ | 1.060″ | 1.185″ | 1.310″ | 1.435″ | 1.560″ | 1.810″ | 1.310″ |
2.410 | 4.70 | 7.87 | 11.05 | 14.22 | 17.40 | 20.57 | 23.75 | 26.92 | 30.10 | 33.27 | 36.45 | 39.62 | 45.97 | 58.67 | |
14 | 0.083″ | 0.209″ | 0.334″ | 0.459″ | 0.584″ | 0.709″ | 0.834″ | 0.959″ | 1.084″ | 1.209″ | 1.334″ | 1.459″ | 1.584″ | 1.834″ | 2.334″ |
2.110 | 5.31 | 8.48 | 11.66 | 14.83 | 18.01 | 21.18 | 24.36 | 27.53 | 30.71 | 33.88 | 37.06 | 40.23 | 46.58 | 59.28 | |
15 | 0.072″ | 0.231″ | 0.356″ | 0.481″ | 0.606″ | 0.731″ | 0.856″ | 0.981″ | 1.106″ | 1.231″ | 1.356″ | 1.481″ | 1.606″ | 1.856″ | 2.356″ |
1.830 | 5.87 | 9.04 | 12.22 | 15.39 | 18.57 | 21.74 | 24.92 | 28.09 | 31.27 | 34.44 | 37.62 | 40.79 | 47.14 | 59.84 | |
16 | 0.065″ | 0.245″ | 0.370″ | 0.495″ | 0.620″ | 0.745″ | 0.870″ | 0.995″ | 1.120″ | 1.245″ | 1.370″ | 1.495″ | 1.620″ | 1.870″ | 2.370″ |
1.650 | 6.22 | 9.40 | 12.57 | 15.75 | 18.92 | 22.10 | 25.27 | 28.45 | 31.62 | 34.80 | 37.97 | 41.15 | 47.50 | 60.20 | |
17 | 0.058″ | 0.259″ | 0.384″ | 0.509″ | 0.634″ | 0.759″ | 0.884″ | 1.09″ | 1.134″ | 1.259″ | 1.374″ | 1.509″ | 1.634″ | 1.884″ | 2.384″ |
1.470 | 6.58 | 9.75 | 12.93 | 16.10 | 19.28 | 22.45 | 25.63 | 28.80 | 31.98 | 35.15 | 38.33 | 41.50 | 47.85 | 60.55 | |
18 | 0.049″ | 0.277″ | 0.402″ | 0.527″ | 0.652″ | 0.777″ | 0.902″ | 1.027″ | 1.152″ | 1.277″ | 1.402″ | 1.527″ | 1.652″ | 1.902″ | 2.402″ |
1.240 | 7.04 | 10.21 | 13.39 | 16.56 | 19.74 | 22.91 | 26.09 | 29.26 | 32.44 | 35.61 | 38.79 | 41.96 | 48.31 | 61.01 | |
19 | 0.042″ | 0.291″ | 0.416″ | 0.541″ | 0.666″ | 0.791″ | 0.916″ | 1.041″ | 1.166″ | 1.291″ | 1.416″ | 1.541″ | 1.666″ | 1.916″ | 2.416″ |
1.070 | 7.39 | 10.57 | 13.74 | 116.92 | 20.09 | 23.27 | 26.44 | 29.62 | 32.79 | 35.97 | 39.14 | 42.32 | 48.67 | 61.37 | |
20 | 0.035″ | 0.305″ | 0.430″ | 0.555″ | 0.680″ | 0.805″ | 0.930″ | 1.055″ | 1.180″ | 1.305″ | 1.430″ | 1.55″ | 1.680″ | 1.930″ | 2.430″ |
0.890 | 7.75 | 10.92 | 14.10 | 17.27 | 20.45 | 23.62 | 26.80 | 29.97 | 33.15 | 36.32 | 39.50 | 42.67 | 49.02 | 61.72 | |
21 | 0.032″ | 0.311″ | 0.436″ | 0.561″ | 0.686″ | 0.811″ | 0.936″ | 1.061″ | 1.186″ | 1.311″ | 1.436″ | 1.561″ | 1.686″ | 1.936″ | 2.436″ |
0.810 | 7.90 | 11.07 | 14.25 | 17.42 | 20.60 | 23.77 | 26.95 | 30.12 | 33.30 | 36.47 | 39.65 | 42.82 | 49.17 | 61.87 | |
22 | 0.028″ | 0.319″ | 0.444″ | 0.569″ | 0.694″ | 0.819″ | 0.944″ | 1.069″ | 1.194″ | 1.319″ | 1.444″ | 1.569″ | 1.694″ | 1.944″ | 2.444″ |
0.710 | 8.10 | 11.28 | 14.45 | 17.63 | 20.80 | 23.98 | 27.15 | 30.33 | 33.50 | 36.68 | 39.85 | 43.03 | 49.38 | 62.08 | |
23 | 0.025″ | 0.325″ | 0.450″ | 0.575″ | 0.700″ | 0.825″ | 0.950″ | 1.075″ | 1.200″ | 1.325″ | 1.450″ | 1.575″ | 1.700″ | 1.950″ | 2.450″ |
0.640 | 8.26 | 11.43 | 14.61 | 17.78 | 20.96 | 24.13 | 27.31 | 30.48 | 33.66 | 36.83 | 40.01 | 43.18 | 49.53 | 62.23 | |
24 | 0.022″ | 0.331″ | 0.456″ | 0.581″ | 0.706″ | 0.831″ | 0.956″ | 1.081″ | 1.206″ | 1.331″ | 1.456″ | 1.581″ | 1.706″ | 1.956″ | 2.456″ |
0.560 | 8.41 | 11.58 | 14.76 | 17.93 | 21.11 | 24.28 | 27.46 | 30.63 | 33.81 | 36.98 | 40.16 | 43.33 | 49.68 | 62.38 |