.020"
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0.0938 inch or 2.38 mm.
A 21 Gage Steel plate is about 1/32 inch thick. Various charts put it at .032" to .033". That is for plain steel. Galvanized, aluminum and stainless have different measurements for the same gage.
The smaller the gage the thicker the material; therefore, for the same material, 14 gage is stronger.
The volume of the plate is (0.5 x 20 x 45) = 450 cubic inchesThe weight is (450) x (0.28) = 126 pounds
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