Sheet-Metal Gauge Chart

Gauge to thickness. Steel uses the Manufacturers' Standard Gauge; aluminium uses the Brown & Sharpe (B&S/AWG) gauge — they are different, so always confirm the material.

Gauge	Steel (in)	Steel (mm)	Aluminium (in)	Aluminium (mm)
7	0.1793	4.554	0.1443	3.665
8	0.1644	4.176	0.1285	3.264
9	0.1495	3.797	0.1144	2.906
10	0.1345	3.416	0.1019	2.588
11	0.1196	3.038	0.0907	2.304
12	0.1046	2.657	0.0808	2.053
13	0.0897	2.278	0.0720	1.829
14	0.0747	1.897	0.0641	1.628
16	0.0598	1.519	0.0508	1.290
18	0.0478	1.214	0.0403	1.024
20	0.0359	0.912	0.0320	0.813
22	0.0299	0.759	0.0253	0.643
24	0.0239	0.607	0.0201	0.511
26	0.0179	0.455	0.0159	0.404

Bend allowance for these thicknesses: Sheet-Metal Bend tool.

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