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About F4 Wiki

F4 Wiki is the public, stable reference for GD&T and how the F4 Application interprets and validates it. Each topic pairs standard guidance with F4-specific behavior so you can move from definition to decision quickly.

What you will find

  • GD&T reference topics with clear definitions and examples.
  • F4 validation rules, edge cases, and decision logic.
  • Templates, glossary entries, and practical examples.

How it works

  • The public view shows approved revisions only.
  • Contributors can propose edits and new pages.
  • Reviewers and moderators approve changes before they are published as the default view.
  • Every revision is attributed to its author.

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