Last updated 10 August 2026
Round. The diameter symbol in the second compartment is what makes the zone cylindrical, and it is not decorative.
A position tolerance of .010 on a hole does not permit five thousandths of error in X and another five in Y. It says the axis has to fall inside a cylinder .010 across, centered on true position. The corner of the square that a coordinate reading describes sits about forty percent further out than the cylinder allows.
This is the most consistently misread callout in production, and it fails in the dangerous direction: machinists who came up on plus and minus tolerancing check position by reading X and Y deviation separately, and pass holes that are out.
| The frame | ⌖|⌀0.01|A |
|---|---|
| Control | Position |
| Family | Location control |
| Datum reference | required |
| Diametral zone | allowed |
| Material condition modifier | allowed |
| Legal under ASME Y14.5-2018 | yes |
Open this case in the calculator, and change the numbers.
Computed by ctrlPlanner. ASME Y14.5-2018.
This checks one frame. ctrlPlanner keys the whole print, keeps every frame intact through the control plan, and carries them onto the AS9102 forms.
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