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The Birmingham Wire Gauge System for Tubing

The Birmingham wire gauge (BWG), also known as Birmingham gauge or Stubs’ iron wire gauge, is a prevalent wire gauge system for determination of diameter of steel wires and thickness of steel sheets. It is also extensively used for specifying the wall thickness of stainless steel tubing. There are a variety of gauge systems such as the Stubs steel wire gauge, American wire gauge (also known as AWG, or Brown and Sharpe gauge), Steel wire gauge (also known as Washburn and Moen gauge), U.S. standard gauge, and British standard gauge, etc. Although similar to each other, these gauge systems are not interchangeable. In fact, when a gauge number given to the tubing wall thickness doesn’t specify a reference gauge system, Birmingham wire gauge is implied.

BWG Correspondence: Gauge no. – inch – mm

Gauge No.inchmm
00000.45411.532
0000.42510.795
000.3809.652
00.3408.636
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
330.0080.203
340.0070.178
350.0050.127
360.0040.102
*The BWG contains 40 gauge numbers from 0000, 000, 00, 0 to 36. The weights of commercial tubing made of stainless steel, carbon and alloy steel are available upon request.

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