Geometric Dimensioning & Tolerancing Symbols
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The table below shows common symbols used to aid the user in understanding geometric dimensioning and tolerancing as per ASME Y14.5-2009. These symbols are used for specifying geometric characteristics and other dimensional requirements on engineering drawings. These geometric characteristic symbols, the tolerance value, and datum reference letters, (where applicable) are combined in a feature control frame to express a geometric tolerance.
| TYPE OF TOLERANCE | CHARACTERISTIC | SYMBOL | |
|---|---|---|---|
| 1 | FORM | Straightness |  |
| 2 | Flatness |  |
|
| 3 | Circularity (Roundness) |  |
|
| 4 | Cylindricity |  |
|
| 5 | PROFILE | Profile of a Line |  |
| 6 | Profile of a Surface |  |
|
| 7 | ORIENTATION | Angularity |  |
| 8 | Perpendicularity |  |
|
| 9 | Parallelism |  |
|
| 10 | LOCATION | Position |  |
| 11 | Concentricity |  |
|
| 12 | Symmetry |  |
|
| 13 | RUNOUT | Circular Runout |  |
| 14 | Total Runout |  |