GDT:Concentricity
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Revision as of 21:16, 14 January 2026 by Admin (talk | contribs) (Created page with "{{Author Credit |author=Admin }} {{GDT Infobox |symbol=Concentricity |type=Location |category=Location |standard=ASME Y14.5 |author=Admin |datums=Primary datum required |modifiers=None (rarely used) |tolerance_zone=Coaxiality of median points relative to the datum axis |image=<!-- TODO: add diagram file name --> |mistakes=Using concentricity where position or runout is more appropriate |related=F4:Concentricity Validation }} == Summary...")
| Symbol | Concentricity |
|---|---|
| Type | Location |
| Category | Location |
| Standard | ASME Y14.5 |
| Author | Admin |
| Datums | Primary datum required |
| Modifiers | None (rarely used) |
| Tolerance zone | Coaxiality of median points relative to the datum axis |
| Image | |
| Common mistakes | Using concentricity where position or runout is more appropriate |
| Related | F4:Concentricity Validation |
Summary
Concentricity controls the alignment of median points of a feature relative to a datum axis.
Definition
Concentricity is evaluated by comparing the median points of the toleranced feature to the datum axis, ensuring they fall within a cylindrical tolerance zone.
When to use it
Use concentricity only when the median point distribution is critical. It is rarely required in modern GD&T practice.
Examples
Example: Concentricity to datum axis
Concentricity applied to a cylindrical feature relative to a datum axis.
Common mistakes
- Using concentricity where position or runout would meet the requirement.
- Omitting a proper datum reference.