METAL GAUGE CHART - printable PDF. This metal gauge chart provides standard gauge numbers in decimals of an inch for sheet metal, strip and tubing, aluminum and stainless steel materials. METAL GAUGE CHART - printable PDF metal gage chart A gauge conversion chart can be used to determine the actual thickness of sheet metal in inches or millimeters. For example, 18 gauge steel, according to a gauge conversion chart, is 0.0478 inch or 1.214 millimeter. The Conversion Table . This conversion table will show us the exact values in decimal inches for every gauge for sheet steel, galvanized steel, stainless steel, aluminum and both strip and tubing. This is very essential when working or dealing with different kinds of steel and making numerous objects from it. The technical content of this page is effective 7/12/18 and supersedes all previous information. Pub. No. CD-SubmittalPro-Identifier 07/18 ClarkDietrich ® PRODUCT INFORMATION *This information is similar to that which may be found in the Rio Grande Gems and Findings Catalog. Throughout the catalog there are useful charts and tips. Wire gauge is a measure for the size of a wire, either in diameter or in cross sectional area. Gauge and weight chart for sheet steel, galvanized steel, stainless steel, aluminum and strip & tubing: For full table with Stainless Steel, Aluminum, Strip and Tubing - rotate the screen!