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.