GDT:Symmetry: Difference between revisions
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Created page with "{{Author Credit |author=Admin }} {{GDT Infobox |symbol=Symmetry |type=Location |category=Location |standard=ASME Y14.5 |author=Admin |datums=Primary datum required |modifiers=None (rarely used) |tolerance_zone=Median plane/axis symmetry about datum |image=<!-- TODO: add diagram file name --> |mistakes=Using symmetry where position or profile would be more appropriate |related=F4:Symmetry Validation }} == Summary == Symmetry controls ho..." |
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|modifiers=None (rarely used) | |modifiers=None (rarely used) | ||
|tolerance_zone=Median plane/axis symmetry about datum | |tolerance_zone=Median plane/axis symmetry about datum | ||
|image= | |image=GDT-Symmetry.svg | ||
|mistakes=Using symmetry where position or profile would be more appropriate | |mistakes=Using symmetry where position or profile would be more appropriate | ||
|related=[[F4:Symmetry Validation]] | |related=[[F4:Symmetry Validation]] | ||
Latest revision as of 19:33, 15 January 2026
| Symbol | Symmetry |
|---|---|
| Type | Location |
| Category | Location |
| Standard | ASME Y14.5 |
| Author | Admin |
| Datums | Primary datum required |
| Modifiers | None (rarely used) |
| Tolerance zone | Median plane/axis symmetry about datum |
| Image | GDT-Symmetry.svg |
| Common mistakes | Using symmetry where position or profile would be more appropriate |
| Related | F4:Symmetry Validation |
Summary
Symmetry controls how a feature’s median points are distributed about a datum center plane or axis.
Definition
Symmetry compares the median points of the toleranced feature to the datum reference plane or axis so they fall within the specified tolerance zone.
When to use it
Use symmetry only when the distribution of median points about a datum is critical. It is rarely required in modern GD&T practice.
Examples
Example: Symmetry about a datum plane
Symmetry applied to a feature relative to datum A.
Common mistakes
- Using symmetry instead of position or profile.
- Missing or unclear datum references.