Standard gauge for sheet iron and steel for the purpose of levying taxes and duties.
Imperial sheet metal sizes.
The series ran 2 4 6 8 10 12 14 16 18 20 22 25 28 32 36 40 45 50 55 60 65 70 75 80 85 90 95 100 110 125 135 150 165 180 200 220 240 and 250.
Corresponds to the standard steel thickness of 0 0329 inches 0 84mm.
Imperial grades ibf in2 psi metric classes mpa n mm2 l9 180 000 psi high tensile.
The equivalent thicknesses differ for each gauge size standard which were developed based on the weight of the sheet for a given material.
The story of gauge.
The corresponding galvanized steel thickness is 0 0366 inches 0 93mm and the corresponding aluminum thickness is 0 028 inches 0 71mm.
Class 12 9 1 200 mpa high tensile.
Sae grade 8 150 000 psi high tensile.
An act of congress march 3 1893 established the u s.
The imperial paper sizes were used to define large sheets of paper and the naming convention was derived from the sheet name and how many times it was folded.