Title 15, Commerce and TradeRelease 119-110
§206 Standard Gauge for Sheet and Plate Iron and Steel
Title 15 › CHAPTER 6 — WEIGHTS AND MEASURES AND STANDARD TIME › SUBCHAPTER III — STANDARD GAUGE FOR IRON AND STEEL › § 206
Summary
Makes one official gauge chart for sheet and plate iron and steel used in the United States. The chart covers gauge numbers from 0000000 down to 38 and gives the exact thickness and weight for each gauge in inches (fractions and decimals), millimeters, ounces and pounds per square foot, and kilograms and pounds per square meter. Only that chart may be used when the United States figures duties and taxes on sheet and plate iron and steel. It must not be used to increase the duties on any imported items.
Full Legal Text
Title 15, §206
Commerce and Trade, Source: USLM XML via OLRC
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.
Reference
Citations & Metadata
Citation
15 U.S.C. § 206
Title 15, Commerce and Trade
Last Updated
Sep 23, 2026
Release point: 119-110