Interactive GD&T Quick Reference - ASME Y14.5 Symbols Explained

How It Works

1. Browse or Click a Symbol

   Use category filters or click a local row to view its source status and datum prompts.

2. Check Source Status

   Current-screen rows and legacy/source-gap rows are labeled separately.

3. Review Feature Control Frame Prompt

   Treat the sample frame as a prompt, not drawing approval or standard text.

4. Check Datum Prompts

   Use the datum row as a screening cue before reading the invoked drawing standard.

5. Verify Inspection Method

   Use the inspection note only as a reminder; the drawing, quality procedure, and metrology plan control acceptance.

Built For

• Machinists screening GD&T callouts before drawing and standard review
• CMM operators checking datum and legacy-symbol prompts before programming
• Quality inspectors identifying source gaps before acceptance decisions
• Manufacturing engineers preparing questions for design or metrology review
• Designers checking whether a symbol choice needs standard/customer review
• Students learning local symbol categories with source warnings visible

Features & Capabilities

12 Current-Screen + 2 Legacy Rows

Local row set for Straightness, Flatness, Circularity, Cylindricity, Profile of Line/Surface, Angularity, Perpendicularity, Parallelism, Position, Circular/Total Runout, plus legacy/source-gap rows for Concentricity and Symmetry.

Interactive Symbol Grid

Visual grid organized by category with click-to-expand detail panels.

FCF Prompt Diagram

Feature control frame prompt showing common compartments without replacing the drawing or standard.

Material Condition Modifiers

MMC, LMC, and RFS reminders with source-boundary warnings.

Inspection Notes

Local inspection reminders that must be checked against the drawing, procedure, equipment capability, and qualified metrology review.

PDF Export

Export a source-aware PDF with warnings and ASME source pointers.

Assumptions

• Rows are local training summaries and source pointers, not reproduced ASME Y14.5 standard text
• Feature control frame examples are prompts only and do not approve a drawing callout
• Material condition modifier notes must be checked against the invoked standard, feature type, and drawing limits
• Inspection notes are local reminders; accepted measurement method depends on the drawing, procedure, equipment, and uncertainty budget
• Concentricity and Symmetry are retained as legacy/source-gap rows for older drawing review
• Datum reference frame and datum feature simulator details require drawing-specific review

Limitations

• Does not reproduce ASME Y14.5 definitions, figures, tables, defaults, examples, or complete rule text
• Does not decide whether ASME Y14.5, ISO GPS, customer notes, or another revision governs a drawing
• Not a substitute for licensed standard access, professional GD&T training, qualified design review, or metrology review
• Does not include validated tolerance stack-up, statistical tolerance, gauge design, or CMM programming methods
• Does not establish datum reference frames for complex, partial, movable, or customized datum features
• Does not approve composite tolerancing, projected zones, profile requirements, or simultaneous requirements

References

1. ASME Y14.5-2018 (R2024) - Dimensioning and Tolerancing source pointer
2. ASME Y14 standards family source pointer
3. Invoked drawing standard, revision block, drawing notes, purchase order, and customer requirements
4. Site quality procedures, inspection plan, metrology equipment capability, and measurement uncertainty budget
5. Supplier/customer interpretation records or qualified GD&T professional review where required
6. ISO GPS standards only where the drawing or contract invokes them

Frequently Asked Questions