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<a href="https://f4.dev/" style="display: inline-block; padding: 6px 10px; border-radius: 8px; background: var(--f4-bg-surface); border: 1px solid var(--f4-border); color: var(--f4-text); text-decoration: none;">F4 website</a> <a href="https://docs.f4.dev/" style="display: inline-block; padding: 6px 10px; border-radius: 8px; background: var(--f4-bg-surface); border: 1px solid var(--f4-border); color: var(--f4-text); text-decoration: none;">Documentation</a> <a href="https://download.f4.dev/" style="display: inline-block; padding: 6px 10px; border-radius: 8px; background: var(--f4-bg-surface); border: 1px solid var(--f4-border); color: var(--f4-text); text-decoration: none;">Downloads</a>
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<a href="/index.php/Category:GDT_Reference" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);"> GD&T Reference
Standard definitions, symbols, and usage guidance.
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<a href="/index.php/Category:F4_Behavior" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);"> F4 Behavior
Rules, checks, and decisions used by the F4 validator.
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<a href="/index.php/Category:Glossary" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);"> Glossary and Examples
Short definitions and worked applications.
Browse glossary and examples
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Browse by category
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<a href="/index.php/Category:Form" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);"> Form
Straightness, flatness, circularity, cylindricity.
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<a href="/index.php/Category:Orientation" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);"> Orientation
Parallelism, perpendicularity, angularity.
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<a href="/index.php/Category:Location" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);"> Location
Position, composite, MSS, concentricity, symmetry.
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<a href="/index.php/Category:Profile" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);"> Profile
Line, surface, composite, MSS.
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<a href="/index.php/Category:Runout" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);"> Runout
Circular and total runout.
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Supporting rules
<a href="/index.php/Category:Modifiers" style="color: var(--f4-accent); text-decoration: none;">Modifiers</a> and <a href="/index.php/Category:Datums" style="color: var(--f4-accent); text-decoration: none;">Datums</a>.
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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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<a href="/index.php/Forum:Start" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);"> Community forum
Announcements, questions, feature requests, and showcases.
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<a href="/index.php/Special:UserBoard" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);"> Messages
Direct messages between contributors.
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