GDT:Circular Runout
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Revision as of 21:20, 14 January 2026 by Admin (talk | contribs) (Created page with "{{Author Credit |author=Admin }} {{GDT Infobox |symbol=Circular Runout |type=Runout |category=Runout |standard=ASME Y14.5 |author=Admin |datums=Primary datum required; secondary optional; tertiary not allowed |modifiers=Material condition modifiers where allowed; ST where allowed |tolerance_zone=Runout at each cross-section relative to datum axis |image=<!-- TODO: add diagram file name --> |mistakes=Missing datum reference; applying runout...")
| Symbol | Circular Runout |
|---|---|
| Type | Runout |
| Category | Runout |
| Standard | ASME Y14.5 |
| Author | Admin |
| Datums | Primary datum required; secondary optional; tertiary not allowed |
| Modifiers | Material condition modifiers where allowed; ST where allowed |
| Tolerance zone | Runout at each cross-section relative to datum axis |
| Image | |
| Common mistakes | Missing datum reference; applying runout to a pattern; using tertiary datum |
| Related | F4:Circular Runout Validation |
Summary
Circular runout controls variation at individual cross-sections of a surface as it rotates about a datum axis.
Definition
For each cross-section, the surface must stay within a radial tolerance zone as the part is rotated about the datum axis.
When to use it
Use circular runout to control roundness and coaxiality at specific sections of a rotating surface relative to a datum axis.
Examples
Example: Runout relative to datum axis
Circular runout applied to a cylindrical surface with datum A as the axis.
Common mistakes
- Missing the primary datum reference.
- Adding a tertiary datum reference.
- Applying runout to a pattern.