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Conversion from (Gauge to Inch/MM) Sheet Steel Thickness Data Table  

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Data table of Sheet Steel Gauge Thickness specifications, the thickness data comes from many references and is accumulated here.

The Table below is as good a reference as to converting from Gauge to Inch to mm.

It lists two of the following standards

BWG - Birmingham Wire Gauge for Iron & Steel Wire
USG - US Standard Gauge for Stainless Steel

Different materials such as stainless steel & aluminium may vary slightly on their dimensions, but the data should be accurate for most everyday purposes with a slight tolerance but to the temperature of the day.

GAUGE SHEET STEEL THICKNESS CONVERSION DATA TABLE to INCH/MM
 B.W.GU.S.G
Gauge No.InchmmInchmm
6 .203 5.156 .2031 5.16
7 .180 4.572 .1875 4.76
8 .165 4.191 .1719 4.37
9 .148 3.759 .1563 3.97
10 .134 3.404 .1406 3.57
11 .120 3.048 .1250 3.18
12 .109 2.769 .1094 2.78
13 .095 2.413 .0938 2.38
14 .083 2.108 .0781 1.98
15 .072 1.829 .0703 1.79
16 .065 1.651 .0625 1.59
17 .058 1.473 .0563 1.43
18 .049 1.245 .0500 1.27
19 .042 1.067 .0438 1.11
20 .035 .889 .0375 .953
21 .032 .813 .0344 .873
22 .028 .711 .0313 .794
23 .025 .635 .0281 .714
24 .022 .559 .0250 .635
25 .020 .508 .0219 .556
26 .018 .457 .0188 .478
27 .016 .406 .0172 .437
28 .014 .356 .0156 .396
29 .013 .330 .0141 .358
30 .012 .305 .0125 .318
31 .010 .254 .0109 .277
32 .009 .229 .0102 .259
33 .008 .203 .0094 .239
34 .007 .178 .0086 .218
35 .005 .127 .0078 .198