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= F4 Wiki =
= F4 Wiki =


<div style="background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 12px; padding: 1.2em; margin-bottom: 1.2em;">
<htmltag tagname="div" style="background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 12px; padding: 1.2em; margin-bottom: 1.2em;">
<div style="display: flex; gap: 16px; align-items: center; flex-wrap: wrap;">
<htmltag tagname="div" style="display: flex; gap: 16px; align-items: center; flex-wrap: wrap;">
<div style="flex: 0 0 auto;">
<htmltag tagname="div" style="flex: 0 0 auto;">
<img src="/resources/assets/logo-white.svg" alt="F4" style="height: 56px; width: auto;">
<htmltag tagname="img" src="/resources/assets/logo-white.svg" alt="F4" width="56" height="56" loading="lazy"></htmltag>
</div>
</htmltag>
<div style="flex: 1 1 320px;">
<htmltag tagname="div" style="flex: 1 1 320px;">
<div style="font-size: 1.2em; font-weight: 600;">The public, stable reference for GD&T and how the F4 Application interprets it.</div>
<htmltag tagname="div" style="font-size: 1.2em; font-weight: 600;">The public, stable reference for GD&T and how the F4 Application interprets it.</htmltag>
<div style="margin-top: 0.4em;">Each topic pairs standard GD&T guidance with F4 validation behavior so you can move from definition to decision quickly.</div>
<htmltag tagname="div" style="margin-top: 0.4em; 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.</htmltag>
</div>
</htmltag>
</div>
</htmltag>
<div style="margin-top: 0.9em; display: flex; gap: 8px; flex-wrap: wrap;">
<htmltag tagname="div" style="margin-top: 0.9em; display: flex; gap: 8px; flex-wrap: wrap;">
<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>
<htmltag tagname="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</htmltag>
<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>
<htmltag tagname="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</htmltag>
<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>
<htmltag tagname="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</htmltag>
</div>
</htmltag>
</div>
</htmltag>


{| style="width: 100%; border-collapse: separate; border-spacing: 12px;"
{| style="width: 100%; border-collapse: separate; border-spacing: 12px;"
|-
|-
| style="vertical-align: top; width: 33%;" |
| style="vertical-align: top; width: 33%;" |
<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);">
<htmltag tagname="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);">
<div style="font-weight: 600;">GD&T Reference</div>
<htmltag tagname="div" style="font-weight: 600;">GD&T Reference</htmltag>
<div style="margin-top: 0.4em;">Standard definitions, symbols, and usage guidance.</div>
<htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Standard definitions, symbols, and usage guidance.</htmltag>
</a>
</htmltag>
| style="vertical-align: top; width: 33%;" |
| style="vertical-align: top; width: 33%;" |
<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);">
<htmltag tagname="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);">
<div style="font-weight: 600;">F4 Behavior</div>
<htmltag tagname="div" style="font-weight: 600;">F4 Behavior</htmltag>
<div style="margin-top: 0.4em;">Rules, checks, and decisions used by the F4 validator.</div>
<htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Rules, checks, and decisions used by the F4 validator.</htmltag>
</a>
</htmltag>
| style="vertical-align: top; width: 33%;" |
| style="vertical-align: top; width: 33%;" |
<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);">
<htmltag tagname="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);">
<div style="font-weight: 600;">Glossary and Examples</div>
<htmltag tagname="div" style="font-weight: 600;">Glossary and Examples</htmltag>
<div style="margin-top: 0.4em;">Short definitions and worked applications.</div>
<htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Short definitions and worked applications.</htmltag>
<div style="margin-top: 0.6em; color: var(--f4-accent);">Browse glossary and examples</div>
<htmltag tagname="div" style="margin-top: 0.6em; color: var(--f4-accent);">Browse glossary and examples</htmltag>
</a>
</htmltag>
|}
|}


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|-
|-
| style="vertical-align: top; width: 50%;" |
| style="vertical-align: top; width: 50%;" |
<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);">
<htmltag tagname="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);">
<div style="font-weight: 600;">Form</div>
<htmltag tagname="div" style="font-weight: 600;">Form</htmltag>
<div style="margin-top: 0.4em;">Straightness, flatness, circularity, cylindricity.</div>
<htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Straightness, flatness, circularity, cylindricity.</htmltag>
</a>
</htmltag>
| style="vertical-align: top; width: 50%;" |
| style="vertical-align: top; width: 50%;" |
<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);">
<htmltag tagname="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);">
<div style="font-weight: 600;">Orientation</div>
<htmltag tagname="div" style="font-weight: 600;">Orientation</htmltag>
<div style="margin-top: 0.4em;">Parallelism, perpendicularity, angularity.</div>
<htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Parallelism, perpendicularity, angularity.</htmltag>
</a>
</htmltag>
|-
|-
| style="vertical-align: top; width: 50%;" |
| style="vertical-align: top; width: 50%;" |
<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);">
<htmltag tagname="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);">
<div style="font-weight: 600;">Location</div>
<htmltag tagname="div" style="font-weight: 600;">Location</htmltag>
<div style="margin-top: 0.4em;">Position, composite, MSS, concentricity, symmetry.</div>
<htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Position, composite, MSS, concentricity, symmetry.</htmltag>
</a>
</htmltag>
| style="vertical-align: top; width: 50%;" |
| style="vertical-align: top; width: 50%;" |
<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);">
<htmltag tagname="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);">
<div style="font-weight: 600;">Profile</div>
<htmltag tagname="div" style="font-weight: 600;">Profile</htmltag>
<div style="margin-top: 0.4em;">Line, surface, composite, MSS.</div>
<htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Line, surface, composite, MSS.</htmltag>
</a>
</htmltag>
|-
|-
| style="vertical-align: top; width: 50%;" |
| style="vertical-align: top; width: 50%;" |
<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);">
<htmltag tagname="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);">
<div style="font-weight: 600;">Runout</div>
<htmltag tagname="div" style="font-weight: 600;">Runout</htmltag>
<div style="margin-top: 0.4em;">Circular and total runout.</div>
<htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Circular and total runout.</htmltag>
</a>
</htmltag>
| style="vertical-align: top; width: 50%;" |
| style="vertical-align: top; width: 50%;" |
<div style="background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em;">
<htmltag tagname="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>
<htmltag tagname="div" style="font-weight: 600;">Supporting rules</htmltag>
<div style="margin-top: 0.4em;"><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>.</div>
<htmltag tagname="div" style="margin-top: 0.4em;">[[Category:Modifiers|Modifiers]] and [[Category:Datums|Datums]].</htmltag>
</div>
</htmltag>
|}
|}


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|-
|-
| style="vertical-align: top; width: 50%;" |
| style="vertical-align: top; width: 50%;" |
<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);">
<htmltag tagname="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);">
<div style="font-weight: 600;">Community forum</div>
<htmltag tagname="div" style="font-weight: 600;">Community forum</htmltag>
<div style="margin-top: 0.4em;">Announcements, questions, feature requests, and showcases.</div>
<htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Announcements, questions, feature requests, and showcases.</htmltag>
</a>
</htmltag>
| style="vertical-align: top; width: 50%;" |
| style="vertical-align: top; width: 50%;" |
<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);">
<htmltag tagname="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);">
<div style="font-weight: 600;">Messages</div>
<htmltag tagname="div" style="font-weight: 600;">Messages</htmltag>
<div style="margin-top: 0.4em;">Direct messages between contributors.</div>
<htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Direct messages between contributors.</htmltag>
</a>
</htmltag>
|}
|}



Revision as of 22:43, 14 January 2026

F4 Wiki

<htmltag tagname="div" style="background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 12px; padding: 1.2em; margin-bottom: 1.2em;"> <htmltag tagname="div" style="display: flex; gap: 16px; align-items: center; flex-wrap: wrap;"> <htmltag tagname="div" style="flex: 0 0 auto;"> <htmltag tagname="img" src="/resources/assets/logo-white.svg" alt="F4" width="56" height="56" loading="lazy"></htmltag> </htmltag> <htmltag tagname="div" style="flex: 1 1 320px;"> <htmltag tagname="div" style="font-size: 1.2em; font-weight: 600;">The public, stable reference for GD&T and how the F4 Application interprets it.</htmltag> <htmltag tagname="div" style="margin-top: 0.4em; 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.</htmltag> </htmltag> </htmltag> <htmltag tagname="div" style="margin-top: 0.9em; display: flex; gap: 8px; flex-wrap: wrap;"> <htmltag tagname="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</htmltag> <htmltag tagname="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</htmltag> <htmltag tagname="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</htmltag> </htmltag> </htmltag>

<htmltag tagname="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);"> <htmltag tagname="div" style="font-weight: 600;">GD&T Reference</htmltag> <htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Standard definitions, symbols, and usage guidance.</htmltag> </htmltag>

<htmltag tagname="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);"> <htmltag tagname="div" style="font-weight: 600;">F4 Behavior</htmltag> <htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Rules, checks, and decisions used by the F4 validator.</htmltag> </htmltag>

<htmltag tagname="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);"> <htmltag tagname="div" style="font-weight: 600;">Glossary and Examples</htmltag> <htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Short definitions and worked applications.</htmltag> <htmltag tagname="div" style="margin-top: 0.6em; color: var(--f4-accent);">Browse glossary and examples</htmltag> </htmltag>

Browse by category

<htmltag tagname="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);"> <htmltag tagname="div" style="font-weight: 600;">Form</htmltag> <htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Straightness, flatness, circularity, cylindricity.</htmltag> </htmltag>

<htmltag tagname="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);"> <htmltag tagname="div" style="font-weight: 600;">Orientation</htmltag> <htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Parallelism, perpendicularity, angularity.</htmltag> </htmltag>

<htmltag tagname="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);"> <htmltag tagname="div" style="font-weight: 600;">Location</htmltag> <htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Position, composite, MSS, concentricity, symmetry.</htmltag> </htmltag>

<htmltag tagname="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);"> <htmltag tagname="div" style="font-weight: 600;">Profile</htmltag> <htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Line, surface, composite, MSS.</htmltag> </htmltag>

<htmltag tagname="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);"> <htmltag tagname="div" style="font-weight: 600;">Runout</htmltag> <htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Circular and total runout.</htmltag> </htmltag>

<htmltag tagname="div" style="background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em;"> <htmltag tagname="div" style="font-weight: 600;">Supporting rules</htmltag> <htmltag tagname="div" style="margin-top: 0.4em;"> and .</htmltag> </htmltag>

Featured pages

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

<htmltag tagname="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);"> <htmltag tagname="div" style="font-weight: 600;">Community forum</htmltag> <htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Announcements, questions, feature requests, and showcases.</htmltag> </htmltag>

<htmltag tagname="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);"> <htmltag tagname="div" style="font-weight: 600;">Messages</htmltag> <htmltag tagname="div" style="margin-top: 0.4em; color: var(--f4-text-muted);">Direct messages between contributors.</htmltag> </htmltag>

Contribute