The Geometric Characteristics, Symbols and Parameters that are used as the building blocks for geometric dimensioning and tolerancing, and M.O.I. standard tolerances for them are listed in the table below:
| SYMBOL | CHARACTERISTIC | TOLERANCE | |
|---|---|---|---|
 | FLATNESS | 10λ/INCH | |
 | STRAIGHTNESS | .005″ | (.13mm) |
 | CIRCULARITY (ROUNDNESS) | .010″ | (.25mm) |
 | CYLINDRICITY | .010″ | (.25mm) |
 | PERPENDICULARITY (SQUARENESS) | 1° | 1° |
 | ANGULARITY | 1° | 1° |
 | PARALLELISM | .005″ | (.13mm) |
 | PROFILE OF A SURFACE | .030″ | (.75mm) |
 | PROFILE OF A LINE | .020″ | (.5mm) |
 | CIRCULAR RUNOUT | .010″ | (.25mm) |
 | TOTAL RUNOUT | .010″ | (.25mm) |
 | POSITION | .020″ | (.5mm) |
 | CONCENTRICITY | .010″ | (.25mm) |
 | SYMMETRY | .010″ | (.25mm) |
NOTE: THESE TOLERANCES APPLY TO MACHINED PARTS ONLY – NOT TO FIRE-POLISHED PARTS