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