GD&T · Runout · ASME Y14.5
Total Runout GD&T Symbol — Meaning and Datum Rule
https://shopmath.org/gdt/total-runout · data verified August 1, 2026
Total Runout (⌰) is a GD&T runout control, and its tolerance zone is full indicator movement across the whole surface. It always references a datum.
- Symbol
- ⌰
- Unicode
- U+2330
- Category
- Runout
- Datum
- always
Total Runout · GD&T runout symbol
⌰
- Unicode
- U+2330
- Datum
- always
- Zone
- Full indicator movement across the whole surface
The value in the feature control frame is the width or diameter of that zone, in the drawing's units.
What Total Runout Controls in GD&T
Same setup as circular runout, but the indicator traverses the full length of the surface while the part rotates and the readings are pooled into one number. That makes total runout a composite control over roundness, straightness, taper, and coaxiality in a single callout.
The Total Runout GD&T Symbol, Zone and Datum Rule
The symbol as it appears in the feature control frame, with the codepoint to type it and the rule it carries.
| Property | Value |
|---|---|
| Symbol | ⌰ |
| Unicode codepoint | U+2330 (TOTAL RUNOUT) |
| Category | Runout controls — Control composite error measured while the part rotates about a datum axis. |
| Tolerance zone | Full indicator movement across the whole surface |
| Datum reference | Always references at least one datum. Without a datum reference frame the callout is incomplete and the drawing is ambiguous. |
| Standard | ASME Y14.5 (cited, not reproduced); ISO 1101 |
| Also called | runout vs total runout |
The symbol character is the Unicode codepoint used in drawings and CAD annotations; drafting standards render it with defined proportions that the font approximates.
Sources and Method for the Total Runout GD&T Reference
- Total Runout symbol and rulescompiled
Symbols and codepoints: Unicode Character Database (Unicode License v3). Characteristic list cross-checked against NASA MSFC GD&T Basics (public domain). Descriptions written from scratch; no ASME Y14.5 text reproduced.
Verified against Unicode Character Database codepoint check; 98/98 structural checks passed
Compiled from independent public sources that agree cell-for-cell.
- Assumptions
- The standard is cited, never reproduced: no ASME Y14.5 definitional text, worked example or figure appears on this site. The description above is original prose.
- ASME Y14.5 and ISO 1101 differ in places — the ISO system uses the envelope requirement differently and does not carry every ASME modifier. Where a drawing names a standard, that standard governs.
- Dataset scope: EXCLUDED: all ASME Y14.5 definitional text, worked examples and figures. Every description on this site is original prose.
- Data last verified
- August 1, 2026
How to Cite This Total Runout GD&T Reference
Citation
ShopMath. "Total Runout GD&T Symbol — Meaning and Datum Rule." ShopMath, verified August 1, 2026, https://shopmath.org/gdt/total-runout
BibTeX
@misc{shopmath-gdt-total-runout,
title = {Total Runout GD&T Symbol — Meaning and Datum Rule},
author = {{ShopMath}},
year = {2026},
howpublished = {\url{https://shopmath.org/gdt/total-runout}},
note = {Data verified 2026-08-01}
}Permanent URL
https://shopmath.org/gdt/total-runout
Common Questions About Total Runout in GD&T
What does Total Runout mean in GD&T?
- Same setup as circular runout, but the indicator traverses the full length of the surface while the part rotates and the readings are pooled into one number. That makes total runout a composite control over roundness, straightness, taper, and coaxiality in a single callout.
What is the Total Runout symbol in GD&T?
- ⌰ — Unicode U+2330 (TOTAL RUNOUT). It goes in the first compartment of the feature control frame, ahead of the tolerance value.
Does Total Runout need a datum?
- Always references at least one datum. Without a datum reference frame the callout is incomplete and the drawing is ambiguous.
What shape is the Total Runout tolerance zone?
- Full indicator movement across the whole surface. Every point of the controlled feature has to lie inside that zone for the part to pass.
Which GD&T controls are in the same group as Total Runout?
- Total Runout is one of 2 runout controls: Total Runout, Circular Runout.