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    SMU ASTM Thickness Tolerances - Galvanised Steel

    Galvanized Sheet Thickness Tolerances

    The table below shows the ASTM thickness tolerances for Galvanized steel as well as weights in pounds per square feet in inches and millimeters. Theoretical Nominal Weights are based on 41.82 pounds per square foot by one inch thick. Theoretical Minimum Weights are based on 40.80 pounds per square foot by one inch thick (or .2833 pounds per cubic inch).

    Galvanized Sheet Thickness Tolerances Tolerances

    Gauge Thickness in Inches Weight in pounds/square feet Thickness in millimeters
    Min. Max. Nom. Min. lb/sf Nom. lb/sf Max. lb/sf Nom kg/m(sq) Min. Max. Nom.
    33 0.006 0.012 0.009 0.2409 0.376 0.486 0.1524 0.3048 0.2286
    32 0.0104 0.0164 0.0134 0.4204 0.563 0.665 0.2642 0.4166 0.3404
    31 0.0112 0.0172 0.0142 0.4531 0.594 0.698 0.2845 0.4369 0.3607
    30 0.0127 0.0187 0.0157 0.5143 0.656 0.759 3.20 0.3188 0.4783 0.3988
    29 0.0142 0.02 0.0172 0.5755 0.719 0.82 0.3569 0.5169 0.4369
    28 0.0157 0.0217 0.0187 0.6367 0.781 0.881 3.81 0.395 0.555 0.475
    27 0.0172 0.0232 0.0202 0.6979 0.844 0.943 0.4331 0.5931 0.5131
    26 0.0187 0.0247 0.0217 0.7591 0.906 1.004 4.42 4712 0.6312 0.5512
    25 0.0217 0.0287 0.0247 0.8407 1.167 0.5274 0.7274 0.6274
    24 0.0236 0.0316 0.0276 0.959 1.156 1.285 5.64 0.601 0.801 0.701
    23 0.0266 0.0346 0.0306 1.0814 1.408 0.6772 0.8772 0.7772
    22 0.0296 0.0376 0.0336 1.2038 1.406 1.53 6.86 0.7534 0.9534 0.8534
    21 0.0326 0.0406 0.0366 1.3263 1.653 0.8296 1.0296 0.9296
    20 0.0356 0.0436 0.0396 1.4486 1.656 1.775 8.08 0.906 1.106 1.006
    19 0.0406 0.0506 0.0456 1.6526 2.061 1.028 1.288 1.158
    18 0.0466 0.0566 0.0516 1.8974 2.156 2.305 10.52 1.181 1.441 1.311
    17 0.0525 0.0625 0.0575 2.1381 2.546 1.331 1.591 1.461
    16 0.0575 0.0695 0.0635 2.342 2.656 2.832 12.96 1.463 1.763 1.613
    15 0.065 0.077 0.071 2.6481 3.138 1.653 1.953 1.803
    14 0.0705 0.0865 0.0785 2.8725 3.291 3.525 16.01 1.784 2.204 1.994
    13 0.0854 0.1014 0.0934 3.4804 4.133 2.162 2.5823 2.372
    12 0.0994 0.1174 0.1084 4.0516 4.531 4.786 22.11 2.523 2.983 2.753
    11 0.1143 0.1323 0.1233 4.6505 5.394 2.902 3.362 3.132
    10 0.1292 0.1472 0.1382 5.2675 5.781 6.002 28.21 3.28 3.74 3.51
    9 0.1442 0.1622 0.1532 5.8795 6.614 3.661 4.121 3.891
    8 0.1591 0.1771 0.1681 6.4874 6.875 7.222 4.04 4.5 4.27

    *Gauge numbers are related to the construction/HVAC industries, while other industries/end uses may use different gauge and thickness designations. We suggest using the actual reference thickness in decimal inches.

    You can visit the ASTM International website at https://www.astm.org/ for more information.