BWG Gauge Chart for Tube Wall thickness

Birmingham Wire Gauge is dimensional gauge for wire, it also specifies wall thickness or diameter of steel tube, the gauge numbers range from 1 to 30, each number represents a value for tube wall thickness, and corresponding to convert inches and millimeters as table below, low BWG number correspond to large size, opposite, high BWG number mean small size。

Birmingham Wire Gauge (BWG) Chart

BWGinmm
10.37.62
20.2837.21
30.2596.58
40.2386.05
50.225.59
60.2035.16
70.1794.57
80.1644.19
90.1473.76
100.1343.4
110.123.05
120.1092.77
130.0952.41
140.0832.11
150.0721.83
160.0651.65
170.0581.47
180.0491.24
190.0421.07
200.0350.89
210.0310.81
220.0280.71
230.0250.64
240.0230.56
250.020.51
260.0180.46
270.0160.41
280.01350.356
290.0130.33
300.0120.305
310.010.254
320.0090.229
330.0080.203
340.0070.178
350.0050.127
360.0040.102

For heat exchanger tube, BWG Gauge is commonly used to define wall thickness, for example, BWG 16 indicates 1。65 mm wall thickness of tube, the outside diameter of heat-exchanger tubes is the actual outside diameter in inches or millimeters。

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