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F4 Wiki
| F4 | The public, stable reference for GD&T and how the F4 Application interprets it. Each topic pairs standard GD&T guidance with F4 validation behavior so you can move from definition to decision quickly. F4 website Documentation Downloads |
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Supporting rules
and .
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Featured pages
- GDT:Straightness - basic line element form control.
- GDT:Flatness - planar form control.
- GDT:Position - primary location control for features of size.
- GDT:Profile of a Surface - shape and location combined.
- F4:Position Validation - how F4 checks position.
How to use this wiki
- The public view shows approved revisions only.
- Each GD&T page links to its matching F4 validation page.
- Use the sidebar or search to find topics quickly.
- When a rule needs interpretation, the F4 page calls out the decision and its impact.
Community
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Community forum |