Revision as of 22:25, 14 January 2026

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 .

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

Community forum
Announcements, questions, feature requests, and showcases.

Messages
Direct messages between contributors.

Contribute

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+| style="padding: 0.9em; vertical-align: top;" | <span style="font-size: 1.2em; font-weight: 600;">The public, stable reference for GD&T and how the F4 Application interprets it.</span><br><span style="color: var(--f4-text-muted);">Each topic pairs standard GD&T guidance with F4 validation behavior so you can move from definition to decision quickly.</span><br><br>[https://f4.dev/ F4 website] &nbsp; [https://docs.f4.dev/ Documentation] &nbsp; [https://download.f4.dev/ Downloads]
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 | style="vertical-align: top; width: 50%;" |
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 <div style="background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em;">
 <div style="font-weight: 600;">Supporting rules</div>
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