In most of the world sheet metal thickness is consistently specified in millimeters.
Car sheet metal 20 gauge.
Commonly used steel sheet metal ranges from 30 gauge to about 7 gauge.
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A gauge conversion chart can be used to determine the actual thickness of sheet metal in inches or millimeters.
20 gauge became common in more recent times and this meant 0 0359 inch thick metal still a lot to work with in bumping and metal finishing.
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This is not a fancy finish sheet but perfect for patches or fabricating brackets or boxes.
This sheet metal was delivered in great condition.
20ga is bit tough to crease well with a crappy bender but if you have a decent press brake it should bend nicely.
Automotive sheet metal once ran in the range of 18 gauge which was 48 thousandths of an inch thick actually 0 0478 inch.
For example 18 gauge steel according to a gauge conversion chart is 0 0478 inch or 1 214 millimeter.