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 |
| 5 | 7/32 | .21875 | 5.55625 | 140 | 8.75 | 3.969 | 42.72 | 94.18 |
| 6 | 13/64 | .203125 | 5.159375 | 130 | 8.125 | 3.685 | 39.67 | 87.45 |
| 7 | 3/16 | .1875 | 4.7625 | 120 | 7.5 | 3.402 | 36.62 | 80.72 |
| 8 | 11/64 | .171875 | 4.365625 | 110 | 6.875 | 3.118 | 33.57 | 74.00 |
| 9 | 5/32 | .15625 | 3.96875 | 100 | 6.25 | 2.835 | 30.52 | 67.27 |
| 10 | 9/64 | .140625 | 3.571875 | 90 | 5.625 | 2.552 | 27.46 | 60.55 |
| 11 | 1/8 | .125 | 3.175 | 80 | 5 | 2.268 | 24.41 | 53.82 |
| 12 | 7/64 | .109375 | 2.778125 | 70 | 4.375 | 1.984 | 21.36 | 47.09 |
| 13 | 3/32 | .09375 | 2.38125 | 60 | 3.75 | 1.701 | 18.31 | 40.36 |
| 14 | 5/64 | .078125 | 1.984375 | 50 | 3.125 | 1.417 | 15.26 | 33.64 |
| 15 | 9/128 | .0703125 | 1.7859375 | 45 | 2.8125 | 1.276 | 13.73 | 30.27 |
| 16 | 1/16 | .0625 | 1.5875 | 40 | 2.5 | 1.134 | 12.21 | 26.91 |
| 17 | 9/160 | .05625 | 1.42875 | 36 | 2.25 | 1.021 | 10.99 | 24.22 |
| 18 | 1/20 | .05 | 1.27 | 32 | 2 | .9072 | 9.765 | 21.53 |
| 19 | 7/160 | .04375 | 1.11125 | 28 | 1.75 | .7938 | 8.544 | 18.84 |
| 20 | 3/80 | .0375 | .9525 | 24 | 1.50 | .6804 | 7.324 | 16.15 |
| 21 | 11/320 | .034375 | .873125 | 22 | 1.375 | .6237 | 6.713 | 14.80 |
| 22 | 1/32 | .03125 | .793750 | 20 | 1.25 | .567 | 6.103 | 13.46 |
| 23 | 9/320 | .028125 | .714375 | 18 | 1.125 | .5103 | 5.493 | 12.11 |
| 24 | 1/40 | .025 | .635 | 16 | 1 | .4536 | 4.882 | 10.76 |
| 25 | 7/320 | .021875 | .555625 | 14 | .875 | .3969 | 4.272 | 9.42 |
| 26 | 3/160 | .01875 | .47625 | 12 | .75 | .3402 | 3.662 | 8.07 |
| 27 | 11/640 | .0171875 | .4365625 | 11 | .6875 | .3119 | 3.357 | 7.40 |
| 28 | 1/64 | .015625 | .396875 | 10 | .625 | .2835 | 3.052 | 6.73 |
| 29 | 9/640 | .0140625 | .3571875 | 9 | .5625 | .2551 | 2.746 | 6.05 |
| 30 | 1/80 | .0125 | .3175 | 8 | .5 | .2268 | 2.441 | 5.38 |
| 31 | 7/640 | .0109375 | .2778125 | 7 | .4375 | .1984 | 2.136 | 4.71 |
| 32 | 13/1280 | .01015625 | .25796875 | 6½ | .40625 | .1843 | 1.983 | 4.37 |
| 33 | 3/320 | .009375 | .238125 | 6 | .375 | .1701 | 1.831 | 4.04 |
| 34 | 11/1280 | .00859375 | .21828125 | 5½ | .34375 | .1559 | 1.678 | 3.70 |
| 35 | 5/640 | .0078125 | .1984375 | 5 | .3125 | .1417 | 1.526 | 3.36 |
| 36 | 9/1280 | .00703125 | .17859375 | 4½ | .28125 | .1276 | 1.373 | 3.03 |
| 37 | 17/2560 | .006640625 | .168671875 | 4¼ | .265625 | .1205 | 1.297 | 2.87 |
| 38 | 1/160 | .00625 | .15875 | 4 | .25 | .1134 | 1.221 | 2.69 |
The same and no other shall be used in determining duties and taxes levied by the United States of America on sheet and plate iron and steel. But this subchapter shall not be construed to increase duties upon any articles which may be imported.
(Mar. 3, 1893, ch. 221, §1, 27 Stat. 746.)
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Last modified: October 26, 2015