B2B METALLURGY • GAUGE TO THICKNESS MATRIX

Sheet Metal Gauge Chart, Decimal Equivalents & Weight Matrix

Comprehensive reference matrix covering standard sheet metal gauge numbers, nominal decimal thickness, tolerance bands, and pound-per-square-foot densities for steel, stainless steel, and aluminum.

Standard Gauge 7 GA – 26 GA Standard Sheet Range

Carbon Steel Density 0.2833 LB/IN³ 40.8 lb/ft² per inch

Stainless Density 0.2900 LB/IN³ 41.76 lb/ft² per inch

Aluminum Density 0.0975 LB/IN³ 14.04 lb/ft² per inch

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Standard Sheet Metal Gauge Reference Table

Note: Gauge numbers do not represent identical thicknesses across carbon steel, stainless, and aluminum. Always specify nominal decimal thickness on engineering drawings.

Gauge No.	Carbon Steel (in)	Carbon Steel (lb/ft²)	Stainless (in)	Aluminum (in)	Aluminum (lb/ft²)
7 GA	0.1793"	7.32 lb	0.1874"	0.1442"	2.02 lb
10 GA	0.1345"	5.49 lb	0.1406"	0.1019"	1.43 lb
11 GA	0.1196"	4.88 lb	0.1250"	0.0907"	1.27 lb
12 GA	0.1046"	4.27 lb	0.1094"	0.0808"	1.13 lb
14 GA	0.0747"	3.05 lb	0.0781"	0.0641"	0.90 lb
16 GA	0.0598"	2.44 lb	0.0625"	0.0508"	0.71 lb
18 GA	0.0478"	1.95 lb	0.0500"	0.0403"	0.57 lb
20 GA	0.0359"	1.46 lb	0.0375"	0.0320"	0.45 lb

TECHNICAL SPECIFICATIONS & COMPLIANCE

Frequently Asked Engineering Questions

Detailed answers regarding our Plainville facility capabilities, material certifications, testing protocols, and defense contract compliance.

Q: Why should engineers specify decimal inches instead of gauge numbers?

Manufacturers use different historical gauge scales: Manufacturers' Standard Gauge for carbon steel, Brown & Sharpe for aluminum, and US Standard for stainless. Specifying decimal dimensions (e.g. 0.090" ±0.003") prevents ambiguity on defense drawings.

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