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For the purpose of securing uniformity the following is established as the only standard gauge for sheet and plate iron and steel in the United States of America, namely:
Number of gauge
Approximate thickness in fractions of an inch
Approximate thickness in decimal parts of an inch
Approximate thickness in millimeters
Weight per square foot in ounces avoirdupois
Weight per square foot in pounds avoirdupois
Weight per square foot in kilograms
Weight per square meter in kilograms
Weight per square meter in pounds
avoirdupois
0000000
1/2
.5
12.7
320
20.00
9.072
97.65
215.28
000000
15/32
.46875
11.90625
300
18.75
8.505
91.55
201.82
00000
7/16
.4375
11.1125
280
17.50
7.983
85.44
188.37
0000
13/32
.40625
10.31875
260
16.25
7.371
79.33
174.91
000
3/8
.375
9.525
240
15
6.804
73.24
161.46
00
11/32
.34375
8.73125
220
13.75
6.237
67.13
148.00
0
5/16
.3125
7.9375
200
12.50
5.67
61.03
134.55
1
9/32
.28125
7.14375
180
11.25
5.103
54.93
121.09
2
17/64
.265625
6.746875
170
10.625
4.819
51.88
114.37
3
1/4
.25
6.35
160
10
4.536
48.82
107.64
4
15/64
.234375
5.953125
150
9.375
4.252
45.77
100.91