The table below shows the ASTM thickness tolerances for hot rolled steel as well as weight in pounds per square feet. Sheet weights are based on ordered thickness at 41.82 pounds per square foot per inch thick (nominal weight).
Sheet weights are based on ordered thickness at 41.82 pounds per square foot per inch thick (nominal weight).
| Gauge* | Min. | Max. | Nom | Lbs/sqft |
| 4 | 0.2152 | 0.2332 | 0.2242 | 9.376 |
| 5 | 0.2002 | 0.2182 | 0.2092 | 8.748 |
| 6 | 0.1853 | 0.2033 | 0.1943 | 8.125 |
| 7 | 0.1713 | 0.1873 | 0.1793 | 7.498 |
| 8 | 0.1564 | 0.1724 | 0.1644 | 6.875 |
| 9 | 0.1415 | 0.1575 | 0.1495 | 6.252 |
| 10 | 0.1265 | 0.1425 | 0.1345 | 5.624 |
| 11 | 0.1116 | 0.1276 | 0.1196 | 5.001 |
| 12 | 0.0966 | 0.1126 | 0.1046 | 4.374 |
| 13 | 0.0827 | 0.0967 | 0.0897 | 3.751 |
| 14 | 0.0677 | 0.0817 | 0.0747 | 3.124 |
| 15 | 0.0613 | 0.0733 | 0.0673 | 2.814 |
| 16 | 0.0538 | 0.0658 | 0.0598 | 2.501 |
| 17 | 0.0478 | 0.0598 | 0.0538 | 2.25 |
| 18 | 0.0428 | 0.0528 | 0.0478 | 1.999 |
*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.