The gauge number 18 holds no relevance to the actual measurements.
Common stainless steel sheet thickness.
0 025 0 64 mm.
0 0187 0 452 0 0217 0 55 0 0179 0 45 0 0159 40 25.
1300 thru 2100.
A gauge conversion chart can be used to determine the actual thickness of sheet metal in inches or millimeters.
Inches mm inches mm 26.
Foils sheets and plates are pretty much the same with the only difference being in thickness.
304 stainless steel has a high resistance to corrosion and lends itself to many types of fabrication making it one of the most widely used forms of stainless steel used today.
There are other measurement units used to categorise metals by thickness though.
Millimetres mils gauge.
Sheet metal is any metal that has a thickness in between 0 5 6 millimetres.
For plates up to 10 inches excl in thickness the tolerance under the specified thickness is 0 010.
For example 18 gauge steel according to a gauge conversion chart is 0 0478 inch or 1 214 millimeter.