GD&T Symbols Chart
| Symbol | Characteristic | Type | Datum? |
|---|---|---|---|
| ⏤ | Straightness | Form | No |
| ⏥ | Flatness | Form | No |
| ○ | Circularity | Form | No |
| ⌭ | Cylindricity | Form | No |
| ⌒ | Profile of a line | Profile | Optional |
| ⌓ | Profile of a surface | Profile | Optional |
| ∠ | Angularity | Orientation | Yes |
| ⟂ | Perpendicularity | Orientation | Yes |
| ∥ | Parallelism | Orientation | Yes |
| ⌖ | Position | Location | Usually |
| ◎ | Concentricity* | Location | Yes |
| ⌯ | Symmetry* | Location | Yes |
| ↗ | Circular runout | Runout | Yes |
| ⌰ | Total runout | Runout | Yes |
Modifiers
| Symbol | Meaning |
|---|---|
| Ⓜ | Maximum material condition (MMC) |
| Ⓛ | Least material condition (LMC) |
| Ⓟ | Projected tolerance zone |
| Ⓕ | Free state |
| Ⓣ | Tangent plane |
| ⌀ | Diameter |
Feature control frame: [ symbol | tolerance + modifiers | datum A | B | C ].
Example: position within a .010 diameter zone at MMC relative to A, B, C.
* Concentricity and symmetry were removed in ASME Y14.5-2018 but still appear on older drawings.
Printable PDF version - GD&T Symbols Cheat Sheet
Clean letter-size sheet for the toolbox or shop wall. Instant download, $3.99.
Clean letter-size sheet for the toolbox or shop wall. Instant download, $3.99.