The table below shows the flatness tolerances for AZ31B magnesium tooling plate.
Deviations from flat are determined by placing a straight edge placed on the surface of a plate and measuring the largest gap, if any, between the tool and the surface of the plate.
The data are based on standards developed by the Aluminum Association and ANSI.
| Deviation From Flat In Inches | |||||
| In Any 1 Foot | In Any 6 Feet | ||||
| Specified Thickness | Guaranteed | Typical | Guaranteed | Typical | |
| > 0.250 | <= 1000 | 0.005 | 0.003 | 0.015 | 0.007 |
| > 1.000 | 0.010 | 0.005 | 0.020 | 0.010 | |