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:

Approximate thickness in fractions of an inch: 1/2

Approximate thickness in decimal parts of an inch: .5

Approximate thickness in millimeters: 12.7

Weight per square foot in ounces avoirdupois: 320

Weight per square foot in pounds avoirdupois: 20.00

Weight per square foot in kilograms: 9.072

Weight per square meter in kilograms: 97.65

Weight per square meter in pounds avoirdupois: 215.28

Approximate thickness in fractions of an inch: 15/32

Approximate thickness in decimal parts of an inch: .46875

Approximate thickness in millimeters: 11.90625

Weight per square foot in ounces avoirdupois: 300

Weight per square foot in pounds avoirdupois: 18.75

Weight per square foot in kilograms: 8.505

Weight per square meter in kilograms: 91.55

Weight per square meter in pounds avoirdupois: 201.82

Approximate thickness in fractions of an inch: 7/16

Approximate thickness in decimal parts of an inch: .4375

Approximate thickness in millimeters: 11.1125

Weight per square foot in ounces avoirdupois: 280

Weight per square foot in pounds avoirdupois: 17.50

Weight per square foot in kilograms: 7.983

Weight per square meter in kilograms: 85.44

Weight per square meter in pounds avoirdupois: 188.37

Approximate thickness in fractions of an inch: 13/32

Approximate thickness in decimal parts of an inch: .40625

Approximate thickness in millimeters: 10.31875

Weight per square foot in ounces avoirdupois: 260

Weight per square foot in pounds avoirdupois: 16.25

Weight per square foot in kilograms: 7.371

Weight per square meter in kilograms: 79.33

Weight per square meter in pounds avoirdupois: 174.91

Approximate thickness in fractions of an inch: 3/8

Approximate thickness in decimal parts of an inch: .375

Approximate thickness in millimeters: 9.525

Weight per square foot in ounces avoirdupois: 240

Weight per square foot in pounds avoirdupois: 15

Weight per square foot in kilograms: 6.804

Weight per square meter in kilograms: 73.24

Weight per square meter in pounds avoirdupois: 161.46

Approximate thickness in fractions of an inch: 11/32

Approximate thickness in decimal parts of an inch: .34375

Approximate thickness in millimeters: 8.73125

Weight per square foot in ounces avoirdupois: 220

Weight per square foot in pounds avoirdupois: 13.75

Weight per square foot in kilograms: 6.237

Weight per square meter in kilograms: 67.13

Weight per square meter in pounds avoirdupois: 148.00

Approximate thickness in fractions of an inch: 5/16

Approximate thickness in decimal parts of an inch: .3125

Approximate thickness in millimeters: 7.9375

Weight per square foot in ounces avoirdupois: 200

Weight per square foot in pounds avoirdupois: 12.50

Weight per square foot in kilograms: 5.67

Weight per square meter in kilograms: 61.03

Weight per square meter in pounds avoirdupois: 134.55

Approximate thickness in fractions of an inch: 9/32

Approximate thickness in decimal parts of an inch: .28125

Approximate thickness in millimeters: 7.14375

Weight per square foot in ounces avoirdupois: 180

Weight per square foot in pounds avoirdupois: 11.25

Weight per square foot in kilograms: 5.103

Weight per square meter in kilograms: 54.93

Weight per square meter in pounds avoirdupois: 121.09

Approximate thickness in fractions of an inch: 17/64

Approximate thickness in decimal parts of an inch: .265625

Approximate thickness in millimeters: 6.746875

Weight per square foot in ounces avoirdupois: 170

Weight per square foot in pounds avoirdupois: 10.625

Weight per square foot in kilograms: 4.819

Weight per square meter in kilograms: 51.88

Weight per square meter in pounds avoirdupois: 114.37

Approximate thickness in fractions of an inch: 1/4

Approximate thickness in decimal parts of an inch: .25

Approximate thickness in millimeters: 6.35

Weight per square foot in ounces avoirdupois: 160

Weight per square foot in pounds avoirdupois: 10

Weight per square foot in kilograms: 4.536

Weight per square meter in kilograms: 48.82

Weight per square meter in pounds avoirdupois: 107.64

Approximate thickness in fractions of an inch: 15/64

Approximate thickness in decimal parts of an inch: .234375

Approximate thickness in millimeters: 5.953125

Weight per square foot in ounces avoirdupois: 150

Weight per square foot in pounds avoirdupois: 9.375

Weight per square foot in kilograms: 4.252

Weight per square meter in kilograms: 45.77

Weight per square meter in pounds avoirdupois: 100.91

Approximate thickness in fractions of an inch: 7/32

Approximate thickness in decimal parts of an inch: .21875

Approximate thickness in millimeters: 5.55625

Weight per square foot in ounces avoirdupois: 140

Weight per square foot in pounds avoirdupois: 8.75

Weight per square foot in kilograms: 3.969

Weight per square meter in kilograms: 42.72

Weight per square meter in pounds avoirdupois: 94.18

Approximate thickness in fractions of an inch: 13/64

Approximate thickness in decimal parts of an inch: .203125

Approximate thickness in millimeters: 5.159375

Weight per square foot in ounces avoirdupois: 130

Weight per square foot in pounds avoirdupois: 8.125

Weight per square foot in kilograms: 3.685

Weight per square meter in kilograms: 39.67

Weight per square meter in pounds avoirdupois: 87.45

Approximate thickness in fractions of an inch: 3/16

Approximate thickness in decimal parts of an inch: .1875

Approximate thickness in millimeters: 4.7625

Weight per square foot in ounces avoirdupois: 120

Weight per square foot in pounds avoirdupois: 7.5

Weight per square foot in kilograms: 3.402

Weight per square meter in kilograms: 36.62

Weight per square meter in pounds avoirdupois: 80.72

Approximate thickness in fractions of an inch: 11/64

Approximate thickness in decimal parts of an inch: .171875

Approximate thickness in millimeters: 4.365625

Weight per square foot in ounces avoirdupois: 110

Weight per square foot in pounds avoirdupois: 6.875

Weight per square foot in kilograms: 3.118

Weight per square meter in kilograms: 33.57

Weight per square meter in pounds avoirdupois: 74.00

Approximate thickness in fractions of an inch: 5/32

Approximate thickness in decimal parts of an inch: **.**15625

Approximate thickness in millimeters: 3.96875

Weight per square foot in ounces avoirdupois: 100

Weight per square foot in pounds avoirdupois: 6.25

Weight per square foot in kilograms: 2.835

Weight per square meter in kilograms: 30.52

Weight per square meter in pounds avoirdupois: 67.27

Approximate thickness in fractions of an inch: 9/64

Approximate thickness in decimal parts of an inch:** .**140625

Approximate thickness in millimeters: 3**.**571875

Weight per square foot in ounces avoirdupois: 90

Weight per square foot in pounds avoirdupois: 5.625

Weight per square foot in kilograms: 2.552

Weight per square meter in kilograms: 27.46

Weight per square meter in pounds avoirdupois: 60.55

Approximate thickness in fractions of an inch: 1/8

Approximate thickness in decimal parts of an inch: .125

Approximate thickness in millimeters: 3.175

Weight per square foot in ounces avoirdupois: 80

Weight per square foot in pounds avoirdupois: 5

Weight per square foot in kilograms: 2.268

Weight per square meter in kilograms: 24.41

Weight per square meter in pounds avoirdupois: 53.82

Approximate thickness in fractions of an inch: 7/64

Approximate thickness in decimal parts of an inch: .109375

Approximate thickness in millimeters: 2.778125

Weight per square foot in ounces avoirdupois: 70

Weight per square foot in pounds avoirdupois: 4.375

Weight per square foot in kilograms: 1.984

Weight per square meter in kilograms: 21.36

Weight per square meter in pounds avoirdupois: 47.09

Approximate thickness in fractions of an inch: 3/32

Approximate thickness in decimal parts of an inch: .09375

Approximate thickness in millimeters: 2.38125

Weight per square foot in ounces avoirdupois: 60

Weight per square foot in pounds avoirdupois: 3.75

Weight per square foot in kilograms: 1.701

Weight per square meter in kilograms: 18.31

Weight per square meter in pounds avoirdupois: 40.36

Approximate thickness in fractions of an inch: 5/64

Approximate thickness in decimal parts of an inch: .078125

Approximate thickness in millimeters: 1.984375

Weight per square foot in ounces avoirdupois: 50

Weight per square foot in pounds avoirdupois: 3.125

Weight per square foot in kilograms: 1.417

Weight per square meter in kilograms: 15.26

Weight per square meter in pounds avoirdupois: 33.64

Approximate thickness in fractions of an inch: 9/128

Approximate thickness in decimal parts of an inch: .0703125

Approximate thickness in millimeters: 1.7859375

Weight per square foot in ounces avoirdupois: 45

Weight per square foot in pounds avoirdupois: 2.8125

Weight per square foot in kilograms: 1.276

Weight per square meter in kilograms: 13.73

Weight per square meter in pounds avoirdupois: 30.27

Approximate thickness in fractions of an inch: 1/16

Approximate thickness in decimal parts of an inch: .0625

Approximate thickness in millimeters: 1.5875

Weight per square foot in ounces avoirdupois: 40

Weight per square foot in pounds avoirdupois: 2.5

Weight per square foot in kilograms: 1.134

Weight per square meter in kilograms: 12.21

Weight per square meter in pounds avoirdupois: 26.91

Approximate thickness in fractions of an inch: 9/160

Approximate thickness in decimal parts of an inch: .05625

Approximate thickness in millimeters: 1.42875

Weight per square foot in ounces avoirdupois: 36

Weight per square foot in pounds avoirdupois: 2.25

Weight per square foot in kilograms: 1.021

Weight per square meter in kilograms: 10.99

Weight per square meter in pounds avoirdupois: 24.22

Approximate thickness in fractions of an inch: 1/20

Approximate thickness in decimal parts of an inch: .05

Approximate thickness in millimeters: 1.27

Weight per square foot in ounces avoirdupois: 32

Weight per square foot in pounds avoirdupois: 2

Weight per square foot in kilograms: .9072

Weight per square meter in kilograms: 9.765

Weight per square meter in pounds avoirdupois: 21.53

Approximate thickness in fractions of an inch: 7/160

Approximate thickness in decimal parts of an inch: .04375

Approximate thickness in millimeters: 1.11125

Weight per square foot in ounces avoirdupois: 28

Weight per square foot in pounds avoirdupois: 1.75

Weight per square foot in kilograms: .7938

Weight per square meter in kilograms: 8.544

Weight per square meter in pounds avoirdupois: 18.84

Approximate thickness in fractions of an inch: 3/80

Approximate thickness in decimal parts of an inch: .0375

Approximate thickness in millimeters: .9525

Weight per square foot in ounces avoirdupois: 24

Weight per square foot in pounds avoirdupois: 1.50

Weight per square foot in kilograms: .6804

Weight per square meter in kilograms: 7.324

Weight per square meter in pounds avoirdupois: 16.15

Approximate thickness in fractions of an inch: 11/320

Approximate thickness in decimal parts of an inch: .034375

Approximate thickness in millimeters: .873125

Weight per square foot in ounces avoirdupois: 22

Weight per square foot in pounds avoirdupois: 1.375

Weight per square foot in kilograms: .6237

Weight per square meter in kilograms: 6.713

Weight per square meter in pounds avoirdupois: 14.80

Approximate thickness in fractions of an inch: 1/32

Approximate thickness in decimal parts of an inch: .03125

Approximate thickness in millimeters: .793750

Weight per square foot in ounces avoirdupois: 20

Weight per square foot in pounds avoirdupois: 1.25

Weight per square foot in kilograms: .567

Weight per square meter in kilograms: 6.103

Weight per square meter in pounds avoirdupois: 13.46

Approximate thickness in fractions of an inch: 9/320

Approximate thickness in decimal parts of an inch: .028125

Approximate thickness in millimeters: .714375

Weight per square foot in ounces avoirdupois: 18

Weight per square foot in pounds avoirdupois: 1.125

Weight per square foot in kilograms: .5103

Weight per square meter in kilograms: 5.493

Weight per square meter in pounds avoirdupois: 12.11

Approximate thickness in fractions of an inch: 1/40

Approximate thickness in decimal parts of an inch: .025

Approximate thickness in millimeters: .635

Weight per square foot in ounces avoirdupois: 16

Weight per square foot in pounds avoirdupois: 1

Weight per square foot in kilograms: .4536

Weight per square meter in kilograms: 4.882

Weight per square meter in pounds avoirdupois: 10.76

Approximate thickness in fractions of an inch: 7/320

Approximate thickness in decimal parts of an inch: .021875

Approximate thickness in millimeters: .555625

Weight per square foot in ounces avoirdupois: 14

Weight per square foot in pounds avoirdupois: .875

Weight per square foot in kilograms: .3969

Weight per square meter in kilograms: 4.272

Weight per square meter in pounds avoirdupois: 9.42

Approximate thickness in fractions of an inch: 3/160

Approximate thickness in decimal parts of an inch: .01875

Approximate thickness in millimeters: .47625

Weight per square foot in ounces avoirdupois: 12

Weight per square foot in pounds avoirdupois: .75

Weight per square foot in kilograms: .3402

Weight per square meter in kilograms: 3.662

Weight per square meter in pounds avoirdupois: 8.07

Approximate thickness in fractions of an inch: 11/640

Approximate thickness in decimal parts of an inch: .0171875

Approximate thickness in millimeters: .4365625

Weight per square foot in ounces avoirdupois: 11

Weight per square foot in pounds avoirdupois: .6875

Weight per square foot in kilograms: .3119

Weight per square meter in kilograms: 3.357

Weight per square meter in pounds avoirdupois: 7.40

Approximate thickness in fractions of an inch: 1/64

Approximate thickness in decimal parts of an inch: .015625

Approximate thickness in millimeters: .396875

Weight per square foot in ounces avoirdupois: 10

Weight per square foot in pounds avoirdupois: .625

Weight per square foot in kilograms: .2835

Weight per square meter in kilograms: 3.052

Weight per square meter in pounds avoirdupois: 6.73

Approximate thickness in fractions of an inch: 9/640

Approximate thickness in decimal parts of an inch: .0140625

Approximate thickness in millimeters: .3571875

Weight per square foot in ounces avoirdupois: 9

Weight per square foot in pounds avoirdupois: .5625

Weight per square foot in kilograms: .2551

Weight per square meter in kilograms: 2.746

Weight per square meter in pounds avoirdupois: 6.05

Approximate thickness in fractions of an inch: 1/80

Approximate thickness in decimal parts of an inch: .0125

Approximate thickness in millimeters: .3175

Weight per square foot in ounces avoirdupois: 8

Weight per square foot in pounds avoirdupois: .5

Weight per square foot in kilograms: .2268

Weight per square meter in kilograms: 2.441

Weight per square meter in pounds avoirdupois: 5.38

Approximate thickness in fractions of an inch: 7/640

Approximate thickness in decimal parts of an inch: .0109375

Approximate thickness in millimeters: .2778125

Weight per square foot in ounces avoirdupois: 7

Weight per square foot in pounds avoirdupois: .4375

Weight per square foot in kilograms: .1984

Weight per square meter in kilograms: 2.136

Weight per square meter in pounds avoirdupois: 4.71

Approximate thickness in fractions of an inch: 13/1280

Approximate thickness in decimal parts of an inch: .01015625

Approximate thickness in millimeters: .25796875

Weight per square foot in ounces avoirdupois: 6 1/2

Weight per square foot in pounds avoirdupois: .40625

Weight per square foot in kilograms: .1843

Weight per square meter in kilograms: 1.983

Weight per square meter in pounds avoirdupois: 4.37

Approximate thickness in fractions of an inch: 3/320

Approximate thickness in decimal parts of an inch: .009375

Approximate thickness in millimeters: .238125

Weight per square foot in ounces avoirdupois: 6

Weight per square foot in pounds avoirdupois: .375

Weight per square foot in kilograms: .1701

Weight per square meter in kilograms: 1.831

Weight per square meter in pounds avoirdupois: 4.04

Approximate thickness in fractions of an inch: 11/1280

Approximate thickness in decimal parts of an inch: .00859375

Approximate thickness in millimeters: .21828125

Weight per square foot in ounces avoirdupois: 5 1/2

Weight per square foot in pounds avoirdupois: .34375

Weight per square foot in kilograms: .1559

Weight per square meter in kilograms: 1.678

Weight per square meter in pounds avoirdupois: 3.70

Approximate thickness in fractions of an inch: 5/640

Approximate thickness in decimal parts of an inch: .0078125

Approximate thickness in millimeters: .1984375

Weight per square foot in ounces avoirdupois: 5

Weight per square foot in pounds avoirdupois: .3125

Weight per square foot in kilograms: .1417

Weight per square meter in kilograms: 1.526

Weight per square meter in pounds avoirdupois: 3.36

Approximate thickness in fractions of an inch: 9/1280

Approximate thickness in decimal parts of an inch: .00703125

Approximate thickness in millimeters: .17859375

Weight per square foot in ounces avoirdupois: 4 1/2

Weight per square foot in pounds avoirdupois: .28125

Weight per square foot in kilograms: .1276

Weight per square meter in kilograms: 1.373

Weight per square meter in pounds avoirdupois: 3.03

Approximate thickness in fractions of an inch: 17/2560

Approximate thickness in decimal parts of an inch: .006640625

Approximate thickness in millimeters: .168671875

Weight per square foot in ounces avoirdupois: 4 1/4

Weight per square foot in pounds avoirdupois: .265625

Weight per square foot in kilograms: .1205

Weight per square meter in kilograms: 1.297

Weight per square meter in pounds avoirdupois: 2.87

Approximate thickness in fractions of an inch: 1/160

Approximate thickness in decimal parts of an inch: .00625

Approximate thickness in millimeters: .15875

Weight per square foot in ounces avoirdupois: 4

Weight per square foot in pounds avoirdupois: .25

Weight per square foot in kilograms: .1134

Weight per square meter in kilograms: 1.221

Weight per square meter in pounds avoirdupois: 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.

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Last revised: 5 September 2010.