7 Gauge Sheet Metal

Steel (MSG) 0.1793″

Galvanized —

Stainless 0.1875″

Aluminum 0.1443″

Steel: 4.55 mm · Stainless: 4.76 mm · Aluminum: 3.67 mm . The same gauge number is a different thickness in each material — always confirm which scale a drawing means, or better, specify decimal thickness.

Neighboring gauges (steel column)

Gauge	Steel	Galvanized	Stainless	Aluminum
5	0.2092	—	0.2187	0.1819
6	0.1943	—	0.2031	0.1620
7	0.1793	—	0.1875	0.1443
8	0.1644	0.1681	0.1719	0.1285
9	0.1495	0.1532	0.1562	0.1144

Measuring wire, not sheet? Wire uses the AWG scale — see AWG 7 (0.1443″ Ø). Aluminum sheet happens to share the AWG scale, which is why the aluminum column matches it.

Data provenance. Sheet-metal gauge tables: Manufacturers’ Standard Gauge (steel), galvanized, and stainless (Industry reference). ASTM B258, Standard Specification for Nominal Diameters of AWG Sizes (ASTM International). Steel per Manufacturers' Standard Gauge; stainless per the conventional supplier table (no governing standard); aluminum per B&S (= AWG, ASTM B258). Sheets carry rolling tolerances. See all data sources.