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Gage for Common Sheet Metals

Metal Gages are often used in the sheet metal industry. The following table illustrates the sizes of the most used sizes. Note that the Mild Steel Gage is covered in greater detail elsewhere in this site. The values presented here may be used for reference and comparison to other materials.

Gage
Number
Brass
mm (in)
Mild Steel
mm (in)
Stainless Steel
mm (in)
8 3.3
(0.129)
4.2
(0.164)
4.4
(0.172)
9 2.9
(0.114)
3.8
(0.150)
4.0
(0.156)
10 2.6
(0.102)
3.4
(0.135)
3.6
(0.141)
11 2.3
(0.091)
3.0
(0.120)
3.2
(0.125)
12 2.1
(0.081)
2.7
(0.105)
2.8
(0.109)
13 1.8
(0.072)
2.3
(0.090)
2.4
(0.094)
14 1.6
(0.064)
1.9
(0.075)
2.0
(0.078)
15 1.4
(0.057)
1.7
(0.067)
1.8
(0.070)
16 1.3
(0.051)
1.5
(0.060)
1.6
(0.063)
17 1.1
(0.045)
1.4
(0.054)
1.4
(0.056)
18 1.0
(0.040)
1.2
(0.048)
1.3
(0.050)
19 0.9
(0.036)
1.1
(0.042)
1.1
(0.044)
20 0.8
(0.032)
0.9
(0.036)
1.0
(0.038)
21 0.7
(0.029)
0.8
(0.033)
0.9
(0.034)
22 0.6
(0.025)
0.8
(0.030)
0.8
(0.031)
23 0.6
(0.023)
0.7
(0.027)
0.7
(0.028)
24 0.5
(0.020)
0.6
(0.024)
0.6
(0.025)
25 0.5
(0.018)
0.5
(0.021)
0.6
(0.022)
26 0.4
(0.016)
0.5
(0.018)
0.5
(0.019)
27 0.4
(0.014)
0.4
(0.016)
0.4
(0.017)
28 0.3
(0.013)
0.4
(0.015)
0.4
(0.016)
Glossary