Total runout (⌰)
Total runout (⌰) limits the variation over a whole surface at once as the part turns about a datum axis, rather than one circle at a time.
Easily confused with
How to read it
The symbol is two arrows pointing up and to the right, joined at their tails by a base line. Keyence describes it as specifying the runout of the entire surface as the part is rotated. Cogorno calls it a compound tolerance that controls all elements of the surface together. The National Physical Laboratory’s guide puts the difference from circular runout precisely: in circular runout each section of the surface is independent, while in total runout the zones for all sections are related and share the same zero point. On a surface around the datum axis, Cogorno lists what total runout takes in: coaxiality, circularity, straightness, angularity, taper and profile. On a face square to the axis, it takes in perpendicularity to the axis and flatness. Unicode encodes it among its drafting symbols as ⌰ (U+2330) TOTAL RUNOUT.
Also searched as: ⌰, total runout gd&t, total runout symbol.
This explains what a symbol specifies on a drawing. It isn't inspection or design guidance; the drawing and the edition of the standard it cites take precedence.
Look-alikes
Circular runout is the single arrow. Cylindricity ⌭ also covers a whole cylindrical surface, but is a form control with no datum axis.
Read next
- Next in GD&T symbolsFeature control frameA feature control frame is the rectangular box that carries a GD&T requirement. Read left to right, it gives the characteristic symbol, then the tolerance (with Ø if the zone is cylindrical, and any modifier), then the datum letters in order of precedence.
- The same shape in Blueprint symbolsStairsA staircase, seen from above. The arrow shows the direction of travel from this floor, labelled with the direction and the number of risers.
More GD&T symbols
The same shape elsewhere
Browse symbols drawn with arrows or lines.
Sources
- Geometric Dimensioning and Tolerancing for Mechanical Design: Instructors’ Guide, Gene R. Cogorno, guide to the McGraw-Hill textbook, rev. 10/12/2020, Technical Training Consultants, Chapter 10, Runout, review answers
- Fundamental Good Practice in the Design and Interpretation of Engineering Drawings for Measurement Processes, Measurement Good Practice Guide No. 79, David Flack and Keith Bevan, 2005, National Physical Laboratory (UK), Chapter 4, Total run-out
- Run-out Tolerance (Run-out Deviation), GD&T Fundamentals, KEYENCE America, Total Run-out
- Miscellaneous Technical, Range: 2300–23FF (code chart), The Unicode Standard, Unicode Consortium, Drafting symbols, U+2330
Researched, edited and approved by Rory Hansen before publishing. Last reviewed October 9, 2026. How we research
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