NOMINAL TUBE DIMENSION CHART (BWG)

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)

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